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Original

Project Galileo

Software Interface Specification

SSI Raw Experiment Data Record (REDR) for Phase 2

Mitchell White

September 25,1997

National Aeronautics and Space Administration

Jet Propulsion Laboratory

California Institute of Technology

Pasadena, California

D-11805

Galileo Project Number 232-15

Project Galileo

Software Interface Specification

Cover Sheet

·

Number: D-11805

Version 2.0

Date: September 25, 1997

SIS Name:

SSI Raw Experiment Data Record (REDR) for Phase 2

Domain:

System Subsystem: MIPS Realtime

Programs:ADESPIKE, BADLABELS,

CATCD, CATLABEL, CDGEN,

GALSOS, GEDRLIST, GLLBLEMCOR,

GLLFILLIN, GLLMVLN, GLLTELEMPROC,

SSIMERGE2, UNMOSAIC

Make/Use: Use

Purpose of Interface (Summary):

This interface describes the format and delivery specifications of the SSI REDR.

Interface Medium:

Disk File:

CD-ROM

SIS Coordinator:

H. Mortensen

Signatures

Approval

W. Sible, GLL Ground S/W System Engineer

M. Belton, SSI Team Leader

S. LaVoie, GLL IPS System Engineer

K. Klaasen, SSI Science Coordinator

J. Johnson, GLL SDT Chief

G. Yagi, MIPS Software Engineer

L. Preheim, MIPS Telemetry CDE

Concurrence

T. Handley, Science Instrument Services Manager

R. Bambery, MIPS Operations Supervisor

Distribution

D. Alexander 168-514

R. Bambery 168-427

S.Braun 264-829

A. Culver 168-514

R. Davis 264-211

D. Jensen 168-514

J. Johnson 264-744

E. Kay-Im 168-414

K. Klaasen 306-438

D. Knight 168-414

S. LaVoie 168-527

H. Mortensen 168-514

S. Noland 168-427

Tina Pauro 168-514

W. Sible 264-419

C. Stanley 168-514

G. Stufflebeam 264-419

T. Thaller 168-514

T. Trong 168-414

Robin Vaughan 301-125L

Vellum Files (2) 111-B25

M. White 168-427

P. Woncik 168-514

G. Yagi 168-427

J. Yoshimizu 168-514

TABLE OF CONTENTS

Document Change Log iii

TBD Items iii

Acronyms and Abbreviations iv

1 INTRODUCTION

1.1 Content Overview 1-1

1.2 Scope 1-1

1.3 Applicable Documents 1-1

1.4 Subsystem Siting 1-1

1.4.1 Interface Location, Medium 1-1

1.4.2 Data Source, Destinations, and Transfer Method 1-1

1.4.3 Generation Method and Frequency 1-2

1.4.4 Pertinent Relationships with Other Interfaces 1-2

1.4.5 Labeling and Identification (Internal/External) 1-2

1.5 Assumptions and Constraints 1-2

2 INTERFACE CHARACTERISTICS

2.1 Hardware Characteristics and Limitations 2-1

2.1.1 Special Equipment and Device Interfaces 2-1

2.1.2 Special Setup Requirements 2-1

2.2 Volume and Size 2-1

2.3 Interface Medium Characteristics 2-1

2.4 Failure Protection, Detection, and Recovery Features 2-2

2.4.1 File Backup Requirements 2-2

2.4.2 Security/Integrity Measures 2-2

3 ACCESS

3.1 Programs Affecting the Interface Data 3-1

3.2 Synchronization Considerations 3-2

3.3 Input/Output Protocols, Calling Sequences 3-2

3.4 Utility Programs 3-2

4 DETAILED INTERFACE SPECIFICATIONS

4.1 Structure and Organization Overview 4-1

4.2 Substructure Definition and Format 4-2

4.2.1 Label Description 4-2

4.2.2 Telemetry Header Description 4-2

4.2.3 Bad-Data Value Header Records 4-10

4.2.4 Body Description 4-11

4.2.5 Vicar label 4-14

4.2.6 Phase 2 Telemetry Formats 4-21

Appendix A Camera Parameters

A.1 Camera Parameters A-1

Appendix B Picture Number

B.1 Picture Number B-1

Appendix C Profile Activity

C.1 Profile Activity C-1

Appendix D MIPS Physical Recording Words

D.1 MIPS Physical Recording Words D-1

Appendix E Bad-Data Value Header

E.1 Bad-Data Value Header E-1

Appendix F Phase One Structure

F.1 Structure and Organization F-1

Appendix G SSI GROUND CALIBRATION LABEL

G.1 SSI Ground Calibration Label G-1

LIST OF TABLES

3-1 Programs Affecting SSI Data 3-1

4-1 Telemetry Header 4-3

4-2 Image Line Record 4-11

4-3 Vicar Label 4-14

4-4 Phase Two Telemetry Format IDs 4-21

A-1 SSI Filters A-1

A-2 SSI Exposure Intervals in Milliseconds A-1

A-3 CCD Fine Temperature Translations A-2

A-4 CCD Course Temperature Translations A-6

D-1 MIPS Physical Recording Words D-1

F-1 Phase One Telemetry Header F-1

F-2 Phase One Image Line Record F-8

F-4 Phase One Telemetry Format IDs F-12

Document Change Log

Change Order

Date

Affected Portions

Original

October 30, 1991

All

Version 2.0

September 10, 1997

All - Updated for GLL Phase II, including Phase I structure

TBD Items

Page

Closure Date

Item Description

None

Acronyms and Abbreviations

ANSI - American National Standards Institute

APB - Asynchronous Playback

ASCII - American Standard Code for Information Interchange

BARC - Block Adaptive Rate Controlled Compression

BPI - Bits per inch

CD-ROM - Compact Disc Read-Only Memory

CDWO - Compact Disk Write Once media

COW - Cut Out Window (same as ROI)

CPU - Central Processing Unit

DN - Data Number

DSN ID - Deep Space Network Identification Number

EDR - Experiment Data Record

EOF - End of File

ERT - Earth Receive Time

GCF - Ground Control Facility

GLL - Galileo Project

GMT - Greenwich Mean Time

HIIPS - Home Institute Image Processing System

ICT - Integer Cosine Transform

IDR - Intermediate Data Record

I/F - Radiance/Solar Flux

ISS - VGR Imaging Science Subsystem

ICT - Integer Cosine Transform

JOI - Jupiter Orbital Insertion

JPL - Jet Propulsion Laboratory

LRS - Low Rate Science

LSB - Least Significant Bit

MIPL - Multimission Image Processing Laboratory

MIPS - Multimission Image Processing Subsystem

MOS - Mission Operations Subsystem

MSEC - Millisecond

N/A - Not Applicable

OCM - On-Chip Mosaic

OPNAV - Optical Navigation

PDS - Planetary Data Subsystem

PTM - Proof Test Model (of SSI)

REDR - Raw Experiment Data Record

RCT - Record Creation Time

R/S - Reed/Solomon

ROI - Region of Interest (same as COW)

S/C - Spacecraft

SCLK - Spacecraft Clock

SDR - System Data Record

SFDU - Standard Formatted Data Unit

SIS - Software Interface Specification

SNR - Signal-to-Noise Ratio

SPICE - Spacecraft, Planetary, Instrument, C-matrix & Event Kernels

SSI - GLL Solid State Imaging Subsytem

STS - Sensor Test Set

TBD - To Be Determined

TDS - Telemetry Delivery Subsystem

TIS - Telemetry Input Subsystem

UDR - Unprocessed Data Record

UTC - Universal Time, Coordinated (same as GMT)

VICAR - Video Image Communication and Retrieval

WBDL - Wide Band Data Link

D-232-15

SSI Raw Experiment Data Record

1 INTRODUCTION

1.1 Content Overview

This Software Interface Specification describes the content, format, and method of transfer of the Solid State Imaging Subsystem (SSI) Raw Experiment Data Records (REDRs) supplied by the Multimission Image Processing Subsystem (MIPS) to the Galileo SSI team and the Planetary Data System (PDS).

1.2 Scope

This specification is applicable to all SSI REDRs generated during the Orbital Operations phase of the mission.

1.3 Applicable Documents

[1] MIPS Phase 2 Software Requirements for SSI, IOM Gary Yagi: March 2, 1994

[2] Project Galileo Software Interface Specification; SSI CD-ROM, D-232-16

[3] Project Galileo Software Interface Specification, SSI Image Catalog (Jupiter) Phase 2 D-3379

[4] UNIX Porting Guide, D-9395, June 29, 1992, Bob Deen

1.4 Subsystem Siting

1.4.1 Interface Location, Medium

The REDR interface medium shall be digital, with the distribution of REDR files available electronically and on CD-ROM discs. Other media sources may be available with prior approval.

1.4.2 Data Source, Destinations, and Transfer Method

The SSI REDR shall be generated by MIPS procedures specifically developed or adapted for Galileo. The input to the REDR generation and validation procedures shall be the Unprocessed Data Record (UDR) disk file generated by the MIPS Galileo realtime subsystem or the program UNMOSAIC which generates UDRs from On-Chip Mosaic UDRs or GLLMVLN which shifts bottom partial records and CCD line drop outs to their correct locations. The REDR will reside at MIPS and shall be available to appropriate project personnel.

1.4.3 Generation Method and Frequency

The REDR shall be generated on the MIPS computer system. During Jupiter orbital operations, the REDRs shall be completed by end of mission.

1.4.4 Pertinent Relationships with Other Interfaces

The REDR format is identical to that of the Unprocessed Data Record (UDR) except the REDR may have a bad data value header and more binary header values and VICAR label field values determined. Also, the data format in the REDR is byte.

The REDR header and line record formats are similar to those used by the MIPS EDR interface to the Voyager Imaging Science Subsystem (ISS); they differ in Voyager and Galileo specific fields.

1.4.5 Labeling and Identification (Internal/External)

The internal file labeling shall be as defined in section 4.2. The external labeling will conform to the file naming conventions found in reference [1].

1.5 Assumptions and Constraints

By design, the REDR files will not be radiometrically corrected.

2 INTERFACE CHARACTERISTICS

2.1 Hardware Characteristics and Limitations

N/A

2.1.1 Special Equipment and Device Interfaces

N/A

2.1.2 Special Setup Requirements

A premastered Write Once Compact disk (CDWO) will be generated and sent to a vendor for REDR CD-ROM disc mass production.

Blemish correction is optionally available for the REDR. If blemish correction is desired, access to the SSI blemish calibration files is necessary.

2.2 Volume and Size

Each REDR file contains a telemetry header record followed by zero or more bad-data value header records (Appendix E), followed by 800 line records, each containing one line of image data.

The length of the REDR line record is independent of the telemetry mode -- all have 1000 bytes. Each line record contains 200 bytes of binary data and 800 bytes of pixel data.

For summation mode (telemetry modes HIS and AI8), the line record is still 1000 bytes . Only the first 400 samples and the first 400 lines of the pixel area are used to store valid image data.

For other modes, see Table 4-4 for the expected number of lines and samples of the data.

2.3 Interface Medium Characteristics

The REDR pixel data and binary headers shall be written in VAX compatible (least significant byte first) format. For users running on hosts other than a VAX, all VICAR programs are capable of converting the pixel data into the current host's format automatically. The binary headers are also converted as needed by the MIPS VICAR programs. Any local VICAR programs must check the header format and convert the data format as necessary. Information about host formats and converting between different formats can be found in the VICAR Porting Guide [4].

The distributed interface medium will be CD-ROM, accessible from standard Unix, VAX/VMS and VICAR commands. REDR header and data records will be organized as 8-bit bytes. The bits in each byte will be numbered from 0 to 7, with bit 0 being the least significant bit. All 2 and 4 byte integers have their least significant bit in the first byte.

The image histogram, which trails the REDR telemetry header, will be organized as 32-bit words.

A detached PDS label file will accompany each REDR file on the CD-ROM. The format of this PDS label is found in reference [2].

2.4 Failure Protection, Detection, and Recovery Features

2.4.1 File Backup Requirements

The backup to the primary medium shall be disk REDR files residing on the MIPS system. Additional copies of the CDROM may be redistributed if required.

2.4.2 Security/Integrity Measures

N/A

3 ACCESS

3.1 Programs Affecting the SSI Data

Table 3-1 lists programs pertaining to SSI data in the form of the Unprocessed Data Records (UDR), Raw Experiment Data Records (REDR), and Experiment Data Records (EDR).

Table 3-1. Programs Affecting SSI Data

Program

Input

Output

Description

ADESPIKE

UDR

REDR

EDR

REDR

REDR

EDR

Removes single-pixel spikes.

BADLABELS

UDR

REDR

Adds bad-data value headers and computer image entropy.

CATCD

REDR

Adds a catalog record to the SSIREDR table describing the CD-ROM location of the REDR.

CATLABEL

UDR

REDR

UDR

REDR

Updates VICAR label with information from SSI catalog and the SPICE kernels.

CDGEN

REDR

EDR

REDR

EDR

Creates the PDS label file and index file to be included on the CD-ROMs.

GALSOS

UDR,

REDR

EDR

Radiometrically corrects; removes blemishes and performs a unit conversion of the pixel data.

GEDRLIST

UDR

Print binary labels and bad-data value headers.

GLLBLEMCOR

REDR

REDR

Removes camera blemishes.

Table 3-1. Programs Affecting SSI Data - Continued

Program

Input

Output

Description

GLLFILLIN

UDR

REDR

EDR

REDR

REDR

EDR

Fills in missing image lines due to data outage or data compression errors.

GLLMVLN

UDR

UDR

Shifts lines downward due to the CDS line dropout problem and bottom partial records.

GLLTELEMPROC

telemetry data

UDR

Generates UDR files.

SSIMERGE2

UDR

UDR

Merges two or more images to produce another image with less missing data.

UNMOSAIC

UDR

UDR

Accepts an on-chip mosaicked (OCM) UDR as input and outputs each mosaic element as a separate UDR.

3.2 Synchronization Considerations

N/A

3.3 Input/Output Protocols, Calling Sequences

N/A

3.4 Utility Programs

GEDRLIST -- displays binary header and prefix labels for verification purposes.

LABEL-LIST -- displays VICAR label information for verification purposes.

LABLIST -- displays VICAR label information in a compact format for verification purposes.

4 DETAILED INTERFACE SPECIFICATIONS

4.1 Structure and Organization Overview

Each REDR file will begin with a VICAR label, followed by the REDR telemetry header and a number of REDR bad-data value headers followed by REDR line records. Each line record will contain 200 bytes of line header information plus the pixel data (8 bits/pixel).

All records have a fixed 1000-byte length within each REDR file. All formats have 1000-byte records. Note: Summation mode images occupy the first 400 lines and 400 samples of the 800 line by 800 sample REDR and UDR.

For all REDRs (including summation mode), the telemetry header is split into two physical records. The first 1000 bytes are placed in the first physical record after the VICAR label (the VICAR label may span more than one physical record), and the last 800 bytes are placed in the next physical record. The last 200 bytes of this record are zero filled.

There will be a one-to-one correspondence between line records and image lines (Excluding the header records, line record n will contain the data for image line n). Missing data lines can be artificially filled by the GLLFILLIN program using interpolation. Missing ICT or Huffman compressed SSI packets will not be interpolated over 8 line slices. The fill-in process will occur based on parameters given by the SSI Team. Certain fields of each line header containing data sequencing information will be maintained even during data gaps.

4.2 Substructure Definition and Format

All fields of the telemetry and line headers are unsigned integers unless specified otherwise. All real numbers are represented in ASCII as noted for each field. The record identifier, byte 0, of every physical record identifies the type of that record. Each 1800-byte telemetry header record is split into two 1000-byte records. The last 200 bytes of the second record contains filler. Bad-data value header records will not cross physical record boundaries.

4.2.1 Label Description

The VICAR label is an ASCII record intended for use by MIPS and VICAR programs; others may ignore this record. This label always appears at the beginning of an REDR file. Since the length of this label may exceed one physical record, non-VICAR programs should ignore all records with a "Record ID", byte 0, of 32 or more. See section 4.2.5 for more details about the VICAR label.

4.2.2 Telemetry Header Description

The REDR telemetry header record contains ancillary information specific to the image. It should not be confused with other binary header records, such as the bad-data value header records which are discussed later.

The REDR telemetry header record is described in Table 4-1.

Table 4-1. Telemetry Header

Byte

Bit

Item

Description

0

Record ID

ALWAYS = 0 for this header.

1

Reserved

Used during Phase One.

2 - 11

Project

Project name, 10 ASCII characters = "GALILEO".

12 - 17

Instrument

Instrument name, 6 ASCII characters = "SSI".

18 - 19

Reserved

Used during Phase One.

20 - 21

Log. Seq.

Logical sequence, binary count reset to zero for the first record of a file (header record) and incremented by one for each record in the file. Always = 0 for this record.

Note

For UDRs, REDRs, and summation-mode EDRs, the telemetry header record spans two physical records.

22 - 23

24 - 25

26

27

28

29 - 30

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (UTC) of the first packet received for this image.

31 - 32

33 - 34

35

36

37

38 - 39

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (UTC) of the last packet received for this image.

40 - 43

44

45

46

RIM

MOD91

MOD10

MOD8

Spacecraft Clock of the first record in the file containing valid data.

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

47 - 50

51

52

53

RIM

MOD91

MOD10

MOD8

Spacecraft Clock of the last record in the file containing valid data.

54 - 55

56 - 57

58

59

60

61 - 62

SCET

YEAR

DAY

HOUR

MIN

SEC

MSEC

Spacecraft Event Time (UTC) at the middle of shutter-open period.

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of minute

63 - 121

MIPS PRD

MIPS Physical Recording Data of the first record of the file (ASCII). See Appendix D. Not used.

122-123

Telemetry Record Format ID

From predtelemfmtid field of ssioverview table of the database. See Section 4.2.6 for values.

124 - 127

Reserved

Used during Phase One.

128

BOOM flag

Boom obscuration flag.

0: Boom present

1: Boom may be present

2: Boom not present

Updated by BOOMFLAG and CATLABEL

129 - 130

Missing Lines

Number of expected line records in the file, excluding those lines not within the COW, with no valid pixels.

131 - 132

Partial Lines

Total number of expected line records in the file, excluding those lines not within the COW, which contain some valid pixels.

133 - 134

Reserved

Used during Phase One.

135 - 136

Seq. Breaks

Total number of packet gaps (indicated by a discontinuity in the packet sequence number).

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

137 - 142

Reserved

Used during Phase One.

143 - 144

SFDUs

Total number of minor frames in this file which were derived from SFDU input. Also equal to the number of packets available for this file.

145 - 151

Pic. No.

Picture number. Seven-ASCII-character "XXYZZZZ" (See Appen-dix C).

152 - 163

Reserved

Used during Phase One.

164 - 165

0

1

2

3

4

5

6

7

8- 15

Compression

Comp Mode

Extended Expos

Flood

Blemish

Clock

ICT Compression

Huffman Compression

Reserved

BARC Compression: 0=off; 1=on

BARC Compression Mode:0= rate control;1= info preserv

Exposure Mode:0= normal:1= extended

Light Flood Status:0= off:1= on

Blemish Protection:0= off;1= on

Parallel Clock State:0= normal;1= inverted

ICT Compression:0=off:1=on

Huffman Compression:0=off;1=on

166 - 171

Mean DN

Mean DN level of all valid pixels in the expected image, excluding data not in the COW. Real number represented as ASCII string in the form "123.12".

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

172 - 177

Truncated bits

Mean number of truncated bits per pixel, excluding data not in the COW. Real number represented as ASCII string in the form "12.345" (for BARC compression only).

178 - 183

Truncated pixel

Mean number of truncated pixels per line. Real number represented as ASCII string in the form "123.12"

(for BARC compression only).

184 - 195

I/F

Mean I over F level. Real number represented as ASCII string in the form "123.12". Added by GALSOS.

196 - 202

Entropy Average

Entropy level for the whole picture (bits per pixel). Real number represented as ASCII string in the form "12.1234". Added by GALSOS or BADLABELS.

203 - 307

Entropies

Entropy level for 15 lines. First line is 50, and incremented by 50 to line 750. 15 real numbers represented as ASCII strings in the form "12.1234" and null ternimated. Added by GALSOS or BADLABELS.

308 - 331

Pointing

Phase 1 Only

Scan platform direction coordinates at middle of shutter-open period in J2000. Three real numbers for right ascension, declina-tion and twist angles represented as ASCII strings in the form "1234.123".

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

332 - 347

Scale Factors

Radiometric calibration scale factors. Two real numbers in the form "123.1234". First number is reflectance/DN, the second is the radiance/DN scale factor. Added by GALSOS.

348 - 379

Slope-File

Radiometric file used for systematic processing. 32 ASCII characters. Added by GALSOS.

380 - 411

Offset-File

Radiometric file (dark current) used for systematic processing. 32 ASCII characters. Added by GALSOS.

412 - 431

Activity

20 ASCII characters of the form: "NNTIOOOOOOMM#SSSXXXX (See Appendix C).

432

Filler

433

Filter

Filter position (See Appendix A).

434

Exposure

Exposure number (See Appendix A).

435

Imaging Mode or Instrument Frame Rate

0: 60-2/3 seconds (Low)

1: 8-2/3 secs (High)

2: 30-1/3 secs (Medium)

3: 2-1/3 secs (Radiation)

4: 15-1/6 secs (Summation)

436

Camera gain state

0: Gain 1 = 400K

1: Gain 2 = 100K

2: Gain 3 = 40 K

3: Gain 4 = 10 K

437- 440

Range

Target's range to sun in kilometers. Updated by CATLABEL.

441

Reserved

Used during Phase One.

442 - 443

Version

MIPS catalog version number, reserved for MIPS use. Not used

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

444 - 447

448

449

450

RIM

MOD91

MOD10

MOD8

Starting SCLK. Spacecraft Clock of the start of image. This clock refers to the start of the SSI frame cycle.

451 - 454

455

456

457

RIM

MOD91

MOD10

MOD8

Ending SCLK. Spacecraft Clock at the end of image. This clock refers to the end of the SSI frame cycle.

458-465

466-473

474-481

482-489

Platform RA

Platform DEC

Platform TWIST

Platform CLOCK

angle

Data portion for SSI3 telemetry packet containing AACS. Values will be represented as ASCII strings in the form 1234.12 and null terminated. RA and DEC are in the EME50 coordinate system

490

491

492

Standard Housekeeping Data Words 14, 19, and 22 for this image when available.

CCD Fine Temperature and

CCD Coarse Temperature

Values from 0 to 255.

See Appendix A for temperature translation tables.

Picture Count

Increments every non-zero exposure and dark current calibration

493

0-4

5-6

7

Standard Housekeeping Data Word 23 for this image when available.

Exposure Number (See Appendix A)

Commanded Gain:0=Gain 1 = 400 K;1=Gain 2 = 100 K;2=Gain 3 = 40 K;3=Gain 4 = 10 K

Light Flood:0=on;1=off

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

494

0-2

3

4

5

6

Standard Housekeeping Data Word 24 for this image when available.

Command Filter Pos. (See Appendix A)

Commanded Filter step:0=absolute;1=step

Commanded Blem. Mode:0=off;1=on

Commanded Expos. Mode:0=normal;1=extended

Commanded Expos Cycle:0=cycle 1;1=cycle 2

495

0-1

-

2-3

4

5-7

Standard Housekeeping Data Word 25 for this image when available.

Gain State used:0=Gain 1=400;1=Gain 2=100 K;2=Gain 3=40;3=Gain 4=10 K

BARC Compressor Status (bit 2) and Compressor Mode (bit 3):0=out;1=in & rate controlled;2=out;3=in & infopreserving

Long Exposure Cycle:0=cycle 1;1=cycle 2

Image Mode:0=60-2/3s;2=8-2/3s;4=30-1/3s;5=15-1/6s;6=2-1/3s

Table 4-1. Telemetry Header - Continued

Byte

Bit

Item

Description

496

0

1-3

4

5

6

7

Standard Housekeeping Data Word 26 for this image when available.

Odd Parity

Actual Filter Position 0-7 (See Appendix A)

Blemish Protection:0=off;1=on

Watch Dog Timer:0=not tripped;1=tripped

Parallel Clock:0=normal;1=inverted

Memory Write Protect:0=write protect off;1=write protecton on

497 - 775

Reserved

776 -1799

Histogram

256 32-bit binary valued histogram of the pixels for this file, including fill data.

NOTE:

Table 4-1 above defines the logical telemetry header structure. The physical structure is dependent upon the file structure, which is described in paragraph 4.1.

4.2.3 Bad-Data Value Header Records

These records describe several types of bad data values. Each record describes only one type of bad data values (dropouts, saturated pixels, Low-full-well pixels, and single spiked pixels). Depending on the number of bad pixels, each Bad-Data Value header may generate several physical records. Each record is independent of the other records and is identified by the "Record Id" field which is located at byte 0. The definition of these records is provided in Appendix E.

4.2.4 Body Description

The REDR body or image line record is described in the Table 4-2.

Table 4-2. Image Line Record

Byte

Bit

Item

Description

0

Record ID

Always = 2 for line records.

1 - 3

Reserved

Used during Phase One.

4 - 5

Log. Seq.

Logical sequence, binary count reset to zero for the first record of a file (header record) and incremented by one for each record in the file.

6 - 7

8 - 9

10

11

12

13 - 14

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (in UTC) of the first telemetry packet with first pixel located in this line. Obtained from the ERT in the GCF block containing this field.

15 - 18

19

20

21

RIM

MOD91

MOD10

MOD8

Spacecraft clock readout of the 1st minor frame of this line.

22 - 80

MIPS Physical Recording Words

59 ASCII characters which define the recording and validation devices, software version and CPU used to write this record and the data on which it was recorded. A detailed explanation of this field is provided in Appendix D. Not used.

Table 4-2. Image Line Record - Continued

Byte

Bit

Item

Description

81 - 82

Telemetry Record Format ID

Predict from ssioverview

table of the database. See section 4.2.6 for values

83

Input Type

Decimal value:

0: S/C Flight Data MOS

1: PTM Data

2: Ext. Simulation

3: S/C Flight Data Test

4: Internal Simulation

5-255: Not used

84

0

1

2

3

4

5

6

7

SFDU data

WBDL

SDR

IDR

EDR

MIPS Realtime

APB

Not used

Input Source. Bit will be set to 1 according to input data source.

85 -102

Reserved

Used during Phase One.

103 - 106

0 - 1

2 - 3

4 - 5

....

24 - 25

26 - 31

BLOCK 0

BLOCK 1

BLOCK 2

....

BLOCK 12

Filler

Truncation. Number of truncated bits per block due to data compression. 2 bits/block, 13 blocks/line. Each block contains 64 pixels except last one which contain 32 pixels (for BARC Compression only).

107 - 108

Truncated

Total number of pixels truncated at end of line due to BARC data compression.

109 - 110

Version

Catalog version for identical images. Not implemented

111 - 112

Reserved

Used during Phase One.

113

DSN ID

Deep Space Network Station where packet was received. As defined in GLL-820-13/OPS-6-8.

114 - 115

Line Number

Image line number, 1-800.

116

Reserved

Used during Phase One.

Table 4-2. Image Line Record - Continued

Byte

Bit

Item

Description

117-118

119-120

121-122

123-124

ss1

es1

ss2

es2

Segments. The starting and ending samples for up to two segments of an image line identifying where data exist . OPNAVs with 3 segments will combine the first 2 segments together into ss1 and es1.

125

0-3

4-7

Line Construction

Number of Telemetry packets used to create this image line.

Full Packets

Partial Packets

126

APID

Application packet ID.

30 for ssi1 and 31 for ssi2.

127 - 130

PKT_Sequence id

TIS packet sequence id. Packet sequence ids are for the purpose of maintaining proper order of packets. If more than one packet is used to reconstruct the line, only the packet id of the first telemetry packet is stored.

131 - 132

PKT_Pixel_Start

Starting sample location for the packet identified by the PKT_Sequence id.

133 - 134 135 - 136

Start Pixel

Stop Pixel

Truth Window Position. The position of the Truth Window. 0,0 indicates no truth window on this line

137 - 138

139 - 140

141

142

143

144 - 145

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

The TIS Record Creation Time of packet.

Table 4-2. Image Line Record - Continued

Byte

Bit

Item

Description

146

Decompression Status/Errors

Decompression status/errors.

0: No errors detected

-1: Incomplete data for decompression

147 - 152

Compression Ratio

Compression ratio for entire line. Real number represented as an ASCII string in the form "123.12"

153 - 199

Reserved.

200 - 599

600 - 999

or

200 - 999

Pixel Data

Filler

or

Pixel Data

400 8-bit unsigned pixel values (summation mode only).

Set to zero (summation mode only).

or

800 8-bit unsigned pixel values.

200 - 999

or

200 - 1799

Pixel Data

or

Pixel Data

Summation Mode:

400 16-bit signed pixel values, radiometrically corrected

Full Frame Mode:

800 16-bit signed pixel values, radiometrically corrected

4.2.5 VICAR Label

The SSI VICAR image label is created as each new image is received by MIPS real time. This section describes the label keywords initially included on the labels when the UDRs and REDRs are created or when the label keywords are added to the labels by the radiometric correction program GALSOS.

The SSI VICAR image label includes data which identify the mission, spacecraft, instrument, target, and frame, and various camera and image geometry data pertinent to the interpretation of the image. During systematic and science processing, individual programs may extract and use various image identifiers and camera parameters stored in the label. The image geometry information included in the label is normally ignored during processing, since more accurate information is available from SPICE files.

As each new version of an image is produced, the VICAR system will automatically copy the image label and add the program name, user name, and date to the processing history. In addition, individual programs may add processing information to the label.

The flight label is in free format, with each label item stored in the form "keyword=value". Summation-mode frames can be identified by their 2-1/3 or 15-1/6 frame rate. The majority of the label items are generated by the Real-Time subsystem's Image-Builder program.

Below is a listing of a sample SSI flight label of a Phase 2 REDR with a spacecraft clock value of 349632000 and ICT compressed. MIPS VICAR program LABEL was used to produce this formatted version of the VICAR label.

************ File S0349632000.R ************

3 dimensional IMAGE file

File organization is BSQ

Pixels are in BYTE format from a AXP-VMS host

1 bands

800 lines per band

800 samples per line

8 lines of binary header

200 bytes of binary prefix per line

---- Task: SSIMERGE -- User: ADC040 -- Fri May 2 11:57:04 1997 ----

MISSION='GALILEO'

SENSOR='SSI'

PICNO='G1G0001'

RIM=3496320

MOD91=0

MOD10=0

MOD8=0

PARTITION=1

PA='G1GSGLOBAL01'

TCA='-001T08:45:50Z'

TARGET='GANYMEDE'

SCETYEAR=1996

SCETDAY=178

SCETHOUR=8

SCETMIN=45

SCETSEC=9

SCETMSEC=457

ERTYEAR=1996

ERTDAY=193

ERTHOUR=6

ERTMIN=58

ERTSEC=29

ERTMSEC=691

FILTER=2

EXP=62.5003

GAIN=2

RATE=4

TLMFMT='HIM'

BOOM='N'

MOFIBE='001000'

ICT_DESPIKE_THRESHOLD=255

ENCODING_TYPE='INTEGER COSINE TRANSFORM '

TBPPXL=0.0

TPPLNE=0.0

INA=30.309

EMA=0.0931004

HRA=10.3176

TWIST=68.3739

CONE=149.024

RA=251.639

DEC=-16.3465

SMEAR=0.1

SEQNO=0

CUT_OUT_WINDOW=(129, 1, 672, 784)

TRUTH_WINDOW=(801, 801, 96, 96)

HUFFMAN_TABLE_NAME='SKEWED'

QUANTIZATION_STEP_SIZE=6

QUANTIZATION_MATRIX_NAME='UNIFORM'

ZIGZAG_PATTERN='ZIGZAG'

COMPRESSION_RATIO=6.55417

MAXIMUM_COMPRESSION_RATIO=25.3927

MINIMUM_COMPRESSION_RATIO=4.25726

PHA=30.4014

HSCL=6738.28

VSCL=6738.84

LAT=-8.05967

LON=155.404

PLRANGE=1.6902e+06

SLRANGE=663734.0

SOLRANGE=7.78215e+08

SUB_SOLAR_LATITUDE=-1.87338

SUB_SOLAR_LONGITUDE=125.604

SUB_SPACECRAFT_LATITUDE=-8.06495

SUB_SPACECRAFT_LONGITUDE=155.497

SUNAZ=184.062

NORAZ=104.344

SCAZ=120.403

SMRAZ=-999.0

RAD=-999.0

SPICE_C_ID='M905'

TARGET_CENTER_DISTANCE=666368.0

SUB_SPACECRAFT_LINE=271.123

SUB_SPACECRAFT_SAMPLE=475.621

READOUTMODE='NOT APPLICABLE'

ENTROPY=3.72596

INTERCEPT_POINT_LINE=271.0

INTERCEPT_POINT_LINE_SAMPLE=475.0

REDR_EXT='1'

************************************************************

Table 4-3. VICAR Label Keywords and Descriptions

LABEL ITEM

DESCRIPTION

SOURCE

BLM=string

Blemish file name.

GALSOS

BOOM=string

Boom obscuration (P=possible,N=not possible, V=presence verified)

RAW

CAL=string

Radiometric file name

GALSOS

CNV=real

DN to radiance conversion factor

GALSOS

COMPRESSION_RATIO=real

ICT or lossless compression ratio

RTS

Table 4-3. VICAR Label Keywords and Descriptions - Continued

LABEL ITEM

DESCRIPTION

SOURCE

CONE=real

Cone angle (-90 to +210)

RAW

CUT_OUT_WINDOW=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Cut-out window size field. See notes. (sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

ICT SNIP

DC=string

Dark-current file name

GALSOS

DEC=real

Declination of pointing vector at shutter open. Valid is -90 to 90.

VIEW,

SPICE

DIRBLM=string

Blemish file directory

GALSOS

DIRCAL=string

Radiometric file directory

GALSOS

DIRDC=string

Dark current file directory

GALSOS

DIROFF=string

Shutter-offset file directory

GALSOS

ERTDAY=integer

Earth received day of year of 1st packet received for this image

RTS

ERTHOUR=integer

Earth received hour of 1st packet received for this image

RTS

ERTMIN=integer

Earth received minute of 1st packet received for this image

RTS

ERTMSEC=integer

Earth received milli-second of 1st packet received for this image

RTS

ERTSEC=integer

Earth received second of 1st packet received for this image

RTS

ERTYEAR=integer

Earth received year of 1st packet received for this image

RTS

EMA=real

Emission angle (0-180)

VIEW,

SPICE

ENCODING_TYPE=string

How the spacecraft compressed the image. (INTEGER COSINE TRANSFORM, HUFFMAN, BARC RATE CONTROL, BARC INFORMATION PRESERVING, or NONE).

RTS

ENTROPY=real

Average entropy level (bits/pixel)

GALSOS,

BADLABELS

EXP=real

Exposure time (msec)

VIEW

FILTER=integer

Filter position (0=CLEAR, 1=GREEN, 2=RED, 3=VIOLET, 4=IR-7560, 5=IR-9680, 6=IR-7270, 7=IR-8890)

VIEW

GAIN=integer

Gain state code (1=400K, 2=100K, 3=40K, 4=10K)

VIEW,

RTS

HRA=real

Hour angle (0-360)

VIEW,

SPICE

HSCL=real

Horizontal picture scale (m/pixel)

VIEW,

SPICE

HUFFMAN_TABLE_NAME=string

Name of Huffman table (7 characters) (SKEWED or UNIFORM). See notes.

ICT

Table 4-3. VICAR Label Keywords and Descriptions - Continued

LABEL ITEM

DESCRIPTION

SOURCE

ICT_DESPIKE_THRESHOLD=integer

ICT despike threshold. Defaulted to 255 for ENCODING_TYPE=HUFFMAN. See notes.

ICT

INA=real

Incidence angle (0-180)

VIEW,

SPICE

INTERCEPT_POINT_LINE=real

The line in the image at which the picture scale and the lighting geometry is calculated.

SPICE

INTERCEPT_POINT_LINE_SAMPLE=real

The sample in the image at which the picture scale and the lighting geometry is calculated.

SPICE

IOF=real

DN to reflectance conversion factor

GALSOS

LAT=real

Latitude at which the picture scale and lighting geometry is calculated. See notes. (-90-+90)

VIEW,

SPICE

LON=real

West longitude at which the picture scale and the lighting geometyr is calculated. See notes. (0-360)

VIEW,

SPICE

MAXIMUM_COMPRESSION_RATIO=

real

ICT or lossless maximum compression ratio. See notes.

RTS

MINIMUM_COMPRESSION_RATIO=

real

ICT or lossless minimum compression ratio. See notes.

RTS

MISSION=string

Mission ID (GALILEO)

RTS

MOD10=integer

MOD10 count for the beginning of the frame cycle

RTS

MOD8=integer

MOD8 count for the beginning of the frame cycle

RTS

MOD91=integer

MOD91 count for the beginning of the frame cycle

RTS

MOFIBE=string

Camera flags (5 characters)

M=on-chip mosaic (1=yes, 0=no)

O=OPNAV image (1=OPNAV, 0=SSI)

F=light flood (1=on, 0=off)

I=clock (1=inverted, 0=non-inverted)

B=blemish protect (1=on, 0=off)

E=ext-exposure (1=extended, 0=normal)

VIEW

VIEW

RTS

RTS

RTS

RTS

NORAZ=real

North azimuth (0-360) of the target body (projected spin axis). See notes.

SPICE,

VIEW

NSTARS=integer

Number of OPNAV star areas

OPNAV

PA=string

Profile Activity (20 characters) See Appendix C

VIEW

PARTITION=integer

Count of number of times RIM is reset

RTS

PHA=real

Phase angle (0-180)

VIEW,

SPICE

PICNO=string

Picture number (7 characters) See Appendix B

VIEW

PLRANGE=real

Distance from spacecraft to planet (km)

VIEW,

SPICE

QUANTIZATION_MATRIX_NAME

=string

Name of ICT quantization matrix. (7 characters)

UNIFORM (also called VG0. See notes.

ICT

QUANTIZATION_STEP_SIZE=integer

Integer value by which ICT transform is divided. Defaulted to 1 for ENCODING_TYPE=HUFFMAN. See notes.

ICT

RA=real

Right-ascension of pointing vector (0-360)

VIEW,

SPICE

Table 4-3. VICAR Label Keywords and Descriptions - Continued

LABEL ITEM

DESCRIPTION

SOURCE

RAD=real

Ring radius of center of frame (km). Ring images only.

SPICE ,

VIEW

RATE=integer

Frame rate code (1=2-1/3 sec, 2=8-2/3, 3=30-1/3, 4=60-2/3, 5=15-1/6)

VIEW

READOUTMODE=string

Camera readout mode. (SAMPLE or CONTIGUOUS) for HMA or HCA else NOT APPLICABLE

VIEW

RIM=integer

RIM count for the beginning of the frame cycle

RTS

SCAZ=real

Spacecraft azimuth (0-360). See notes.

SPICE,

VIEW

SCETDAY=integer

Spacecraft-Event-Time day-of-year for shutter center of the shutter event.

VIEW

SCETHOUR=integer

Spacecraft-Event-Time hour-of-day for shutter center of the shutter event.

VIEW

SCETMIN=integer

Spacecraft-Event-Time minute-of-hour for shutter center of the shutter event.

VIEW

SCETMSEC=integer

Spacecraft-Event-Time msec-of-second for shutter center of the shutter event.

VIEW

SCETSEC=integer

Spacecraft-Event-Time second-of-minute for shutter center of the shutter event.

VIEW

SCETYEAR=integer

Spacecraft-Event-Time year for shutter center of the shutter event.

VIEW

SENSOR=string

Sensor ID (SSI)

RTS

SEQNO=integer

ICT Image version sequence number

ICT

SLRANGE=real

S/C-to-target slant range (km)

VIEW,

SPICE

SMEAR=real

Smear magnitude (pixels). Not calculated because angular velocity is not available in the SPICE CK. Will always be 0.1

VIEW

SMRAZ=real

Smear azimuth (0-360). See notes. Not calulated because angular velocity is not available in the SPICE CK. Will always be

-999.0

SPICE,

VIEW

SPICE_C_ID=string

4-char name of C-matrix source

SPICE,

VIEW

SO=string

Shutter-offset file name

GALSOS

SOLRANGE=real

Distance from sun to target-body (km)

VIEW,

SPICE

STAR1=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Size field for first OPNAV star area. See notes.

(sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

OPNAV

Table 4-3. VICAR Label Keywords and Descriptions - Continued

LABEL ITEM

DESCRIPTION

SOURCE

STAR2=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Size field for second OPNAV star area. See notes.

(sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

OPNAV

STAR3=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Size field for third OPNAV star area. See notes.

(sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

OPNAV

STAR4=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Size field for fourth OPNAV star area. See notes.

(sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

OPNAV

STAR5=(sl,ss,nl,ns)

sl=integer

ss=integer

nl=integer

ns=integer

Size field for fifth OPNAV star area. See notes.

(sl=starting line; ss=starting sample; nl=number of lines; ns=number of samples)

OPNAV

SUB_SOLAR_LATITUDE=real

Planetocentric latitude of the sub-solar point

VIEW,

SPICE

SUB_SOLAR_LONGITUDE=real

West longitude of the sub-solar point

VIEW,

SPICE

SUB_SPACECRAFT_LATITUDE

=real

Planetocentric latitude of the sub-spacecraft point (the target center)

VIEW,

SPICE

SUB_SPACECRAFT_LINE=real

Sub-spacecraft line coordinate

SPICE,

VIEW

SUB_SPACECRAFT_LONGITUDE

=real

West longitude of the sub-spacecraft point (the target center)

VIEW,

SPICE

SUB_SPACECRAFT_SAMP=real

Sub-spacecraft sample coordinate

SPICE,

VIEW

SUNAZ=real

Sun azimuth (0-360). See notes

SPICE,

VIEW

TARGET=string

Target-body name (12 characters)

VIEW

TARGET_CENTER_DISTANCE=real

Distance from spacecraft to target center(km)

SPICE

TBPPXL=real

Mean number of truncated bits/pixel, BARC only

RTS

TCA=string

Time from closest approach (13 chars) in the format + or - dddThh:mm:ssZ to Jupiter.

VIEW

TLMFMT=string

Telemetry format (3 characters)

VIEW

TPPLNE=real

Mean number of truncated pixels/line, BARC only

RTS

Table 4-3. VICAR Label Keywords and Descriptions - Continued

LABEL ITEM

DESCRIPTION

SOURCE

TRUTH_WINDOW=(sl,ss,nl,ns)

sl,ss,nl,ns=integer

Starting line and starting sample, and number of lines and number of samples of an up to 96x96 pixel truth window; it's the area where no compression was performed. Defaulted to (801,801,96,96) when no truth window exist and when ENCODING_TYPE=HUFFMAN. See notes.

RTS

TWIST=real

Twist angle (0-360)

VIEW,

SPICE

UBWC=string

Uneven-bit-weight correction (ON or OFF)

GALSOS

VSCL=real

Vertical picture scale (m/pixel)

VIEW,

SPICE

ZIGZAG_PATTERN=string

(7 characters)

Name of ICT zigzag coding pattern (ZIGZAG or ALT). Defaulted to ZIGZAG for ENCODING_TYPE=HUFFMAN. See notes.

ICT

Notes:

1) Sources are:

RAW=ssiraw table of database

RTS=real time system,

VIEW=ssioverview table of database,

ICT=ssiict table of database,

OPNAV=ssiopnav table of database,

GALSOS=radiometric correction program,

SPICE=SPICE kernels, typically via the CATLABEL program.

2) If the target is the ring-plane of Jupiter, label items LAT and LON are replaced by RAD and LON.

3) Prior to JOI, MOFIBE was FIBE and ENCODING_TYPE was BARC.

4) TBPPXL, TPPLNE apply to BARC compression only.

5) QUANTIZATION_STEP_SIZE, QUANTIZATION_MATRIX_NAME, TRUTH_WINDOW, ICT_DESPIKE_THRESHOLD and ZIGZAG_PATTERN apply to ICT compression only and are defaulted for Huffman only (lossless) compression. MINIMUM_COMPRESSION_RATIO, MAX_COMPRESSION_RATIO, and COMPRESION_RATIO, apply to both ICT aand Huffman (lossless) compression. CUT_OUT_WINDOW applies to ICT, Huffman only (lossless), and BARC compression

6) HUFFMAN_TABLE applies to Huffman only (lossless) and ICT compression images. Note that ICT compressed images are also HUFFMAN compressed but are identified as ICT.

7) NSTARS,STAR1,STAR2,STAR3,STAR4 and STAR5 apply to OPNAV images only.

8) All azimuth angles are measured clockwise from right in the image.

9) An image "size field" defines the location and size of an image area. It consists of four numbers: starting line, starting sample, number of lines, and number of samples. The origin of the image coordinate system is at (LINE,SAMPLE)=(1,1) for the upper-left corner, with samples increasing to the right and lines increasing downwards.

10) INA, EMA, PHA, HRA, SMEAR, HSCL, VSCL, SLRANGE, LAT, and LON are calculated at the center of the image if all four corners lie on the target, other wise it is calculated at the target center if visible, otherwise the image is scanned at 20 pixel intervals for a point at highest resolution.

11) The J2000 coordinate system is used for all orientation calculations.

Application program label interface: Label items may be stored, retrieved, or deleted via subroutines XLADD, XLGET, or XLDEL, respectively. Subroutine VIC1LAB may be used to retrieve all ground-calibration labels. The subroutine ABLE86 will extract data from either flight or ground-calibration labels and return the values in an array. Note that programs intended for multimission support should not call ABLE86 directly, but use GETLABCON.

When an image is map-projected, the following label items relating to image geometry are updated by MAP3: SUNAZ, SMRAZ, SCAZ, NORAZ, SMRAZ, LAT, LON, HSCL, VSCL. This is not yet implemented.

4.2.6 Phase 2 Telemetry Format IDs

Table 4-4 below lists the SSI telemetry formats, their Phase 2 downlink data rates and number of lines and samples.

Table 4-4. Phase 2 Telemetry Formats

Telemetry Format Number

Mnemonic

Downlink Data Rate

Number Lines and Samples

Comment

5

HIS

115.2 Kbps

400x400

Last 6 pixels are fill (800x394)

6

HMA

115.2 Kbps

400x800

Last 12 pixels are fill (400x788) Sample readout:800x800 every 2nd line

7

HCA

115.2 Kbps

200x800

Sample readout:800x800 every 4th line

17

HIM

115.2 Kbps

800x800

Last 12 pixels are fill (800x788)

22

IM8

806.4 Kbps

800x800

23

AI8

806.4 Kbps

400x400

25

IM4

403.2 Kbps

800x800

Appendix A

Camera Parameters

Table A-1 below describes SSI filters and Table A-2 gives exposure values. Table A-3 provides the correspondence for the gain state and frame mode between the VICAR label and the binary telemetry header. These values were obtained from reference [3].

Table A-1. SSI Filters

Filter No.

Filter name

0

CLEAR

1

GREEN

2

RED

3

VIOLET

4

IR-7560

5

IR-9680

6

IR-7270

7

IR-8890

Table A-2. SSI Exposure Intervals in Milliseconds

Note: All exposure times were returned low by 4-1/6 ms except for exposures 1, 2, and 4

Exposure No.

Expected Exposure Time

Actual Expos Time

Exposure No.

Expected Exposure Time

Actual Expos Time

0

0

0

10

100

95-5/6

1

4-1/6

4-1/6

11

133-1/3

129-1/6

2

6-1/4

6-1/4

12

200

195-5/6

3

8-1/3

4-1/6

13

266-2/3

262-1/2

4

12-1/2

12-1/2

14

400

395-5/6

5

16-2/3

12-1/2

15

533-1/3

529-1/6

6

25

20-5/6

16

800

795-5/6

7

33-1/3

29-1/6

17

1066-2/3

1062-1/2

8

50

45-5/6

18

1600

1595-5/6

9

66-2/3

62-1/3

19

2133-1/3

2129-1/6

Table A-2. SSI Exposure Intervals in Milliseconds - Continued

Exposure No.

Exposure Time

Actual Expos Time

Exposure No.

Exposure Time

Actual Expos. Time

20

3200

3195-5/6

26

25600

25595-5/6

21

4266-2/3

4262-1/2

27

34133-1/3

34129-1/6

22

6400

6395-5/6

28

51200

51195-5/6

23

8533-1/3

8529-1/6

29

0-Dark Current

0

24

12800

12795-5/6

30

0

0

25

17066-2/3

17062-1/2

31

0

0

Table A-3. SSI CCD Fine Temperature Translation Table in degrees Celsius

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

0

-121.5

15

-120.037

30

-118.573

1

-121.402

16

-119.939

31

-118.476

2

-121.305

17

-119.841

32

-118.378

3

-121.207

18

-119.744

33

-118.28

4

-121.11

19

-119.646

34

-118.183

5

-121.012

20

-119.549

35

-118.085

6

-120.915

21

-119.451

36

-117.988

7

-120.817

22

-119.354

37

-117.89

8

-120.72

23

-119.256

38

-117.793

9

-120.622

24

-119.159

39

-117.695

10

-120.524

25

-119.061

40

-117.598

11

-120.427

26

-118.963

41

-117.5

12

-120.329

27

-118.866

42

-117.402

13

-120.232

28

-118.768

43

-117.305

14

-120.134

29

-118.671

44

-117.207

Table A-3. SSI CCD Fine Temperature Translation Table-Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

45

-117.11

71

-114.573

97

-112.037

46

-117.012

72

-114.476

98

-111.939

47

-116.915

73

-114.378

99

-111.841

48

-116.817

74

-114.28

100

-111.744

49

-116.72

75

-114.183

101

-111.646

50

-116.622

76

-114.085

102

-111.549

51

-116.524

77

-113.988

103

-111.451

52

-116.427

78

-113.89

104

-111.354

53

-116.329

79

-113.793

105

-111.256

54

-116.232

80

-113.695

106

-111.159

55

-116.134

81

-113.598

107

-111.061

56

-116.037

82

-113.5

108

-110.963

57

-115.939

83

-113.402

109

-110.866

58

-115.841

84

-113.305

100

-110.768

59

-115.744

85

-113.207

111

-110.671

60

-115.646

86

-113.11

112

-110.573

61

-115.549

87

-113.012

113

-110.476

62

-115.451

88

-112.915

114

-110.378

63

-115.354

89

-112.817

115

-110.28

64

-115.256

90

-112.72

116

-110.183

65

-115.159

91

-112.622

117

-110.085

66

-115.061

92

-112.524

118

-109.988

67

-114.963

93

-112.427

119

-109.89

68

-114.866

94

-112.329

120

-109.793

69

-114.768

95

-112.232

121

-109.695

70

-114.671

96

-112.134

122

-109.598

Table A-3. SSI CCD Fine Temperature Translation Table-Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

123

-109.5

149

-106.963

175

-104.427

124

-109.402

150

-106.866

176

-104.329

125

-109.305

151

-106.768

177

-104.232

126

-109.207

152

-106.671

178

-104.134

127

-109.11

153

-106.573

179

-104.037

128

-109.012

154

-106.476

180

-103.939

129

-108.915

155

-106.378

181

-103.841

130

-108.817

156

-106.28

182

-103.744

131

-108.72

157

-106.183

183

-103.676

132

-108.622

158

-106.085

184

-103.549

133

-108.524

159

-105.988

185

-103.451

134

-108.427

160

-105.89

186

-103.354

135

-108.329

161

-105.793

187

-103.256

136

-108.232

162

-105.695

188

-103.159

137

-108.134

163

-105.598

189

-103.061

138

-108.037

164

-105.5

190

-102.963

139

-107.939

165

-105.402

191

-102.866

140

-107.841

166

-105.305

192

-102.768

141

-107.744

167

-105.207

193

-102.671

142

-107.646

168

-105.11

194

-102.573

143

-107.549

169

-105.012

195

-102.476

144

-107.451

170

-104.915

196

-102.378

145

-107.354

171

-104.817

197

-102.28

146

-107.256

172

-104.72

198

-102.183

147

-107.159

173

-104.622

199

-102.085

148

-107.061

174

-104.524

200

-101.988

Table A-3. SSI CCD Fine Temperature Translation Table-Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

201

-101.89

220

-100.037

239

-98.1829

202

-101.793

221

-99.939

240

-98.0854

203

-101.695

222

-99.8415

241

-97.9878

204

-101.598

223

-99.7439

242

-97.8902

205

-101.5

224

-99.6463

243

-97.7927

206

-101.402

225

-99.5488

244

-97.6951

207

-101.305

226

-99.4512

245

-97.5976

208

-101.207

227

-99.3537

246

-97.5

209

-101.11

228

-99.2561

247

-97.4024

210

-101.012

229

-99.1585

248

-97.3049

211

-100.915

230

-99.061

249

-97.2073

212

-100.817

231

-98.9634

250

-97.1098

213

-100.72

232

-98.8659

251

-97.0

214

-100.622

233

-98.7683

252

-96.9

215

-100.524

234

-98.6707

253

-96.8

216

-100.427

235

-98.5732

254

-96.7

217

-100.329

236

-98.4756

255

-96.6

218

-100.232

237

-98.378

219

-100.134

238

-98.2805

Table A-4. SSI CCD Course Temperature Translation Table in degrees Celsius

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

0

-152

26

-130.951

52

-109.903

1

-151.19

27

-130.142

53

-109.093

2

-150.381

28

-129.332

54

-108.283

3

-149.571

29

-128.523

55

-107.474

4

-148.762

30

-127.713

56

-106.664

5

-147.952

31

-126.903

57

-105.855

6

-147.143

32

-126.094

58

-105.045

7

-146.333

33

-125.284

59

-104.236

8

-145.523

34

-124.475

60

-103.426

9

-144.714

35

-123.665

61

-102.617

10

-143.904

36

-122.856

62

-101.807

11

-143.095

37

-122.046

63

-100.997

12

-142.285

38

-121.237

64

-100.188

13

-141.476

39

-120.427

65

-99.3783

14

-140.666

40

-119.617

66

-98.5687

15

-139.857

41

-118.808

67

-97.7591

16

-139.047

42

-117.998

68

-96.9496

17

-138.237

43

-117.189

69

-96.14

18

-137.428

44

-116.379

70

-95.3304

19

-136.618

45

-115.57

71

-94.5209

20

-135.809

46

-114.76

72

-93.7113

21

-134.999

47

-113.95

73

-92.9017

22

-134.19

48

-113.141

74

-92.0922

23

-133.38

49

-112.331

75

-91.2826

24

-132.57

50

-111.522

76

-90.473

25

-131.761

51

-110.712

77

-89.6635

Table A-4. SSI CCD Course Temperature Translation Table- Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

78

-88.8539

104

-67.8052

130

-46.7565

79

-88.0443

105

-66.9957

131

-45.947

80

-87.2348

106

-66.1861

132

-45.1374

81

-86.4252

107

-65.3765

133

-44.3278

82

-85.6157

108

-64.567

134

-43.5183

83

-84.8061

109

-63.7574

135

-42.7087

84

-83.9965

100

-62.9478

136

-41.8991

85

-83.187

111

-62.1383

137

-41.0896

86

-82.3774

112

-61.3287

138

-40.28

87

-81.5678

113

-60.5191

139

-39.4704

88

-80.7583

114

-59.7096

140

-38.6609

89

-79.9487

115

-58.9

141

-37.8513

90

-79.1391

116

-58.0904

142

-37.0417

91

-78.3296

117

-57.2809

143

-36.2322

92

-77.52

118

-56.4713

144

-35.4226

93

-76.7104

119

-55.6617

145

-34.613

94

-75.9009

120

-54.8522

146

-33.8035

95

-75.0913

121

-54.0426

147

-32.9939

96

-74.2817

122

-53.233

148

-32.1843

97

-73.4722

123

-52.4235

149

-31.3748

98

-72.6626

124

-51.6139

150

-30.5652

99

-71.853

125

-50.8043

151

-29.7557

100

-71.0435

126

-49.9948

152

-28.9461

101

-70.2339

127

-49.1852

153

-28.1365

102

-69.4243

128

-48.3757

154

-27.327

103

-68.6148

129

-47.5661

155

-26.5174

Table A-4. SSI CCD Course Temperature Translation Table- Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

156

-25.7078

182

-4.65913

208

16.3896

157

-24.8983

183

-3.84957

209

17.1991

158

-24.0887

184

-3.04

210

18.0087

159

-23.2791

185

-2.23043

211

18.8183

160

-22.4696

186

-1.42087

212

19.6278

161

-21.66

187

-0.611304

213

20.4374

162

-20.8504

188

0.198261

214

21.247

163

-20.0409

189

1.00783

215

22.0565

164

-19.2313

190

1.81739

216

22.8661

165

-18.4217

191

2.62696

217

23.6757

166

-17.6122

192

3.43652

218

24.4852

167

-16.8026

193

4.24609

219

25.2948

168

-15.993

194

5.05565

220

26.1043

169

-15.1835

195

5.86522

221

26.9139

170

-14.3739

196

6.67478

222

27.7235

171

-13.5643

197

7.48435

223

28.533

172

-12.7548

198

8.29391

224

29.3426

173

-11.9452

199

9.10348

225

30.1522

174

-11.1357

200

9.91304

226

30.9617

175

-10.3261

201

10.7226

227

31.7713

176

-9.51652

202

11.5322

228

32.5809

177

-8.70696

203

12.3417

229

33.3904

178

-7.89739

204

13.1513

230

34.2

179

-7.08783

205

13.9609

231

35.0096

180

-6.27826

206

14.7704

232

35.8191

181

-5.4687

207

15.58

233

36.6287

Table A-4. SSI CCD Course Temperature Translation Table- Continued

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

Temperature Value

Temperature Translation

234

37.4383

242

43.9148

250

50.3913

235

38.2478

243

44.7243

251

51.2

236

39.0574

244

45.5339

252

52.0

237

39.867

245

46.3435

253

52.8

238

40.6765

246

47.153

254

53.6

239

41.4861

246

47.9626

255

54.4

240

42.2957

248

48.7722

241

43.1052

249

49.5817

Appendix B

Picture Number

The structure of the picture number field in the REDR header is a seven ASCII character string, of the form "XXYZZZZ"

where:

XX = Orbit. 00 is from 5 days before JOI to the periapse following JOI. Subsequent orbits increment normally. Approach images are separated into logical phases and designated A1, A2, A3 or similar. Cruise images are separated into calender periods of 3, 6, or 12 months and designated C1, C2,

Y = Target Body.

where:

J

Jupiter

A

Amalthea

I

Io

E

Europa

G

Ganymede

C

Callisto

S

Minor satellites

R

Ring

H

Star

L

Moon

W

Earth

V

Venus

U

Ida

P

Gaspra

N

Non-Science (Calibration)

etc.

etc.

ZZZZ = Picture Count. This count will be generated in the sequence generation process and will be incremented separately for each target body in each orbit. It will jump a few counts for each profile activity initialization to simplify subsequent sequence changes.

Appendix C

Profile Activity

Structure of the ACTIVITY field in the REDR header is a 20 ASCII character string of the form "NNTIOOOOOOMM#SSSXXXP" obtained from the operative SSI Profile Activity.

where:

NN

Orbit Number

T

Scan platform target body initial (if applicable).

I

Instrument

OOOOOO

Orbit planning guide objective mnemonic.

MM

Sequential OAPEL number for each value of NNTIOOOOOO.

#

Multiple observation flag symbol (- or *).

SSS

PA set number

XXXX

Remote sensing code

Appendix D

MIPS Physical Recording Words

Table D-1 below describes the structure of the MIPS physical recording words. All fields are in ASCII.

Table D-1. MIPS Physical Recording Words

Bytes

Item

Description

8

OS

Operating system version number "Vxxx.yyy". Eight ASCII characters

8

CPU

CPU name, "CODA1", CODA2", etc.

11

DATE

Generation date "DD-MMM-YYYY"

32

Filler

No description

Appendix E

Bad-Data Value Header

This section defines the format and contents of the binary labels used to store SSI bad-data values.

There are two parts to the binary label: the binary header, and the binary prefix. The binary header precedes the image data (as do the ASCII labels) and contains information which pertain to the entire image. The binary prefix precedes each image line and contains information specific to each line. Binary labels are created by adding the U_NLB and U_NBB keywords to the XVOPEN call. Binary labels are accessed from a file already containing them by adding the CONDITION, BINARY keywords to the XVOPEN call. Note that since VICAR programs do not normally include these keywords in their XVOPEN calls, binary labels are usually ignored and disappear when new versions of an image are created. Binary labels were originally designed to support the generation of Voyager EDRs. The binary labels are written in VAX compatible (least significant byte first) format.

The binary header consists of an arbitrary number of records. The first record contains ancillary telemetry information. The remaining binary header records contain bad-data information,stored as a sequence of "objects" in 16-bit integer format for EDRs and 8-bit integers for REDRs. The following types of objects have been defined:

Object Type

Code

Format

Single Pixels

1

Line, sample

Line segments

2

line, starting-sample, number-of-samples

Column segments

3

sample, starting-line, number-of-lines

These objects are used to encode the following bad-data types:

Bad Data Type

Record ID

Created By

Data dropout

3

GALSOS or BADLABELS

Saturated pixels

4

GALSOS or BADLABELS

Low-full-well pixels

5

GALSOS or GLL BLEMCOR

Single-pixel spikes

6

ADESPIKE

Reed-Solomon overflow

7

GALSOS or BADLABELS

Single-pixel spikes are stored as single pixels, data drop-outs, saturated pixels, and Reed-Solomon overflow records are stored as line segments, and low-full-well pixels as column segments.

Note: For compressed image data, all pixels to the right of the first bit error will be corrupted. Since it is not possible to determine where this bit error occurs, the entire line is flagged as bad.

Each record will be in 16-bit integer data format and will contain only one type of object. The first three integers of each record contain the record ID, object code (CODE), and the number of objects in the record (N), respectively. The remainder of the record will contain a sequence of N objects. The maximum number of objects which can be stored on a record is a function of the EDR record length and object code. Full-frame and summation-mode EDRs have record lengths of 1800 bytes and 1000 bytes, respectively:

Code

Full-Frame

Max. Objects

Summation-Mode

Max. Objects

1

448

248

2

299

165

3

299

165

If more objects of a certain type exist, they are written on subsequent records. The records are not necessarily written in any particular order, although they must all precede the image line records.

Example 1: Let a binary header record contain the sequence of integers 6,1,3,211,104,322,111,401,233. The record contains single-pixel spikes (6) encoded as single-pixels (1). There are three objects encoded as line-sample coordinates: (211,104), (322,111), and (401,233).

Example 2: Let a binary header record contain the sequence of integers 4,2,2,110,216,105,789,420,381. The record contains saturated pixels (4) encoded as line segments (2). There are two objects. The first line segment is on line 110 and from sample 216 to 320. The second line segment is on line 789 and from sample 420 to 800.

Example 3: Let a binary header record contain the sequence of integers 5,3,2,299,710,91,521,72,729. The record contains low-full-well pixels (5) encoded as column segments (3). There are two objects. The first column segment is on sample 299 and from lines 710 to 800. The second column segment is on sample 521 and from lines 72 to 800.

The following is an example of a program which reads an image containing bad-data information, does something with this information, and outputs an image which does not contain any binary labels (all subroutines other than XV routines are fictitious):

COMMON/HDRREC/RECORDID,CODE,NOBJECTS,SPIX(2,448)!Binary header record

INTEGER*2 RECORDID,CODE,NOBJECTS,SPIX

INTEGER*2 BUF(900),LSEG(3,299),CSEG(3,299)

EQUIVALENCE (BUF,RECORDID),(SPIX,LSEG,CSEG)

COMMON/IMGREC/LHDR(100),PIXELS(800) !Image line record

INTEGER*2 LHDR,PIXELS,LBUF(900)

EQUIVALENCE (LBUF,LHDR)

CALL XVUNIT(IUNIT,'INP',1,IND)

CALL XVOPEN(IUNIT,IND,'COND','BINARY')

CALL XVGET(IUNIT,IND,'NL',NL,'NS',NS,'NLB',NLB)

DO L=2,NLB !Loop through the binary header records

CALL XVREAD(IUNIT,BUF,IND,'LINE',L)

IF (CODE.EQ.1) CALL SINGLE_PIXEL(SPIX,RECORDID,NOBJECTS)

IF (CODE.EQ.2) CALL LINE_SEGMENT(LSEG,RECORDID,NOBJECTS)

IF (CODE.EQ.3) CALL COLUMN_SEGMENT(CSEG,RECORDID,NOBJECTS)

ENDDO

CALL XVUNIT(OUNIT,'OUT',1,IND)

CALL XVOPEN(OUNIT,IND,'OP','WRITE')

DO L=1,NL!Loop through each image line record

CALL XVREAD(IUNIT,LBUF,IND)!Read a line record

CALL PROCESS_LINE(PIXELS,NS)!Process the image line

CALL XVWRIT(OUNIT,PIXELS,IND) !Write the image line

ENDDO

Appendix F

Phase I EDR Structure

The basic structure of the Phase II EDR/REDR/UDR is identical to the Phase I structure. The only differences deal with the field content. In some instances the fields are still available but the meaning has changed slightly. In other cases the field is not applicable, or there is a new field entirely. For compatibility, the original Phase I field structures and definitions are described in this appendix.

F.1 Phase 1 Telemetry Header Record

Table F-1. Phase 1 Telemetry Header

Byte

Bit

Item

Description

0

Record ID

ALWAYS = 0 for this header.

1

File Number

Binary count reset to zero for the first file on each physical product and incremented by one for each header record written. Valid for tape interface only.

2 - 11

Project

Project name, 10 ASCII characters = "GALILEO".

12 - 17

Instrument

Instrument name, 6 ASCII characters = "SSI".

18 - 19

Phys. Seq.

Physical sequence, binary count reset to zero for first record written on the physical product and incremented by one for each subsequent write

(includes VICAR label records). Valid for tape interface only.

Table F-1. Phase 1 Telemetry Header -Continued

Byte

Bit

Item

Description

20 - 21

Log. Seq.

Logical sequence, binary count reset to zero for the first record of a file (header record) and incremented by one for each record in the file. Always = 0 for this record.

Note

For UDRs, REDRs, and summation-mode EDRs, this header record spans two physical records.

22 - 23

24 - 25

26

27

28

29 - 30

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (UTC) of the first record containing valid data.

31 - 32

33 - 34

35

36

37

38 - 39

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (UTC) of the last record containing valid data.

40 - 43

44

45

46

RIM

MOD91

MOD10

MOD8

Spacecraft Clock of the first record in the file containing valid data.

47 - 50

51

52

53

RIM

MOD91

MOD10

MOD8

Spacecraft Clock of the last record in the file containing valid data.

Table F-1. Phase 1 Telemetry Header - Continued

Byte

Bit

Item

Description

54 - 55

56 - 57

58

59

60

61 - 62

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of minute

Spacecraft Event Time (UTC) at the middle of shutter-open period.

63- 121

MIPS PRD

MIPS Physical Recording Data of the first record of the file (ASCII). See Section F.3.

122 - 123

Format ID

The correct format ID for this image as derived from line records by a voting algorithm.

124 - 127

Sync Errors

The sum of all bad bits in the sync code contained in all the line records in the file which contain valid data.

128

BOOM flag

Boom obscuration flag.

0: Boom present

1: Boom may be present

2: Boom not present

129 - 130

Missing Lines

Number of line records in the file with no valid pixels in the raw version of the image.

131 - 132

Partial Lines

Total number of line records in the file which contain some valid pixels.

133 - 134

Unreadables

Total number of records from the IDR and/or SDR which were unreadable and which fell within a time period for which data was required for this file.

Note

For SDR input this does not necessarily result in data loss.

Table F-1. Phase 1 Telemetry Header - Continued

Byte

Bit

Item

Description

135 - 136

Seq. Breaks

Total number of IDR/SDR gaps (indicated by a discontinuity in the logical record numbers) which occurred during the time data was required for this file.

137 - 138

Source/Input

Logical sum (result of successive inclusive or operations) of all source/input line records with valid data.

139 - 140

WBDLs

Total number of minor frames in this file which were derived from WBDL input.

141 - 142

SDRs

Total number of minor frames in this file which were derived from SDR input.

143 - 144

SFDUs

Total number of minor frames in this file which were derived from SFDU input.

145 - 151

Pic. No.

Picture number. Seven-ASCII-character "XXYZZZZ" (See Appen-dix C).

152 - 163

SSI LRS

First SSI LRS packet during this image.

164 - 165

0

1

2

Compression

Comp Mode

Exposure

Compression:0=not compressed;1=compressed

Compression Mode (Valid only if compression flag is set):0= rate control; 1= info preserv

Exposure Mode:0= normal;1= extended

Table F-1. Phase 1 Telemetry Header - Continued

Byte

Bit

Item

Description

164 - 165

(con't)

3

4

5

6 - 15

Flood

Blemish

Clock

Reserved

Light Flood Status:0= off;1= on

Blemish Protection:0= off;1= on

Parallel Clock State:0= normal;1= inverted

166 - 171

Mean DN

Mean DN level of all valid pixels. Real number represented as ASCII string in the form "123.12".

172 - 177

Truncated bits

Mean number of truncated bits/pixel. Real number represented as ASCII string in the form "12.345".

178 - 183

Truncated pixel

Mean number of truncated pixels/line. Real number represented as ASCII string in the form "123.12".

184 - 195

I/F

Mean I/F level. Real number represented as ASCII string in the from "123.12".

196 - 202

Entropy Average

Entropy level for the whole picture (bits/pixel). Real number represented as ASCII string in the form "12.1234".

203 - 307

Entropies

Entropy level for 15 lines. First line is 50, and incremented by 50 to line 750. 15 real numbers represented as ASCII strings in the form "12.1234".

Table F-1. Phase 1 Telemetry Header - Continued

Byte

Bit

Item

Description

308 - 331

Pointing

Scan platform coordinates at direction middle of shutter-open period in J2000. Three numbers for right ascension, declina-tion and twist angles. Three real numbers represented as ASCII strings in the form of "1234.123".

332 - 347

Scale Factors

Radiometric calibration scale factors. Two real numbers in the form of "123.1234". First number is reflectance/DN, the second is the radiance/DN scale factor.

348 - 379

Slope-File

Radiometric file used for systematic processing. 32 ASCII characters.

380 - 411

Offset-File

Radiometric file (dark current) used for systematic processing. 32 ASCII characters.

412 - 431

Activity

20 ASCII characters of the form: "NNTIOOOOOOMM#SSSXXXX (See Appendix C).

432

Filler

433

Filter

Filter position (See Appendix A).

434

Exposure

Exposure number (See Appendix A).

435

Imaging Mode

0: 60-2/3 sec. (Low)

1: 8-2/3 sec. (High)

2: 30-1/3 sec. (Medium)

3: 2-1/3 sec. (Radiation)

436

Camera gain state

0: Gain 1 400K

1: Gain 2 100K

2: Gain 3 40K

3: Gain 4 10K

437 - 440

Range

Target's range to sun in kilometers.

Table F-1. Phase 1 Telemetry Header - Continued

Byte

Bit

Item

Description

441

Format

Telemetry format number (See Appendix B).

442 - 443

Version

MIPS catalog version number, reserved for MIPS use.

444 - 447

448

449

450

RIM

MOD91

MOD10

MOD8

Spacecraft Clock of the start of image. This clock refers to the start of the SSI frame cycle.

451 - 454

455

456

457

RIM

MOD91

MOD10

MOD8

Spacecraft Clock at the end of image. This clock refers to the end of the SSI frame cycle.

458 - 775

Reserved

776 -1799

Histogram

256 32-bit binary valued histogram of the pixels for this file, including fill data.

F.2 Phase 1 Image Line Record

Table F-2. Phase 1 Image Line Record

Byte

Bit

Item

Description

0

Record ID

Always = 2 for line records.

1

File Number

Binary count reset to zero for the first file on physical product and incremented by one for each header record written. Always zero on disk.

2 - 3

Phys. Seq.

Physical sequence, binary count reset to zero for the first record written on a given physical product and incremented by one for each subsequent write.

4 - 5

Log. Seq.

Logical sequence, binary count reset to zero for the first record of a file (header record) and incremented by one for each record in the file.

6 - 7

8 - 9

10

11

12

13 - 14

YEAR

DAY

HOUR

MIN

SEC

MSEC

Year

Day of year

Hour of day

Minute of hour

Second of minute

Millisecond of second

Earth Received Time (UTC) of the first bit of the telemetry frame which contained the first pixel of this line as interpolated from the ERT in the GCF block containing this bit. (The first bit of the frame is the first bit of the sync code).

Table F-2. Phase 1 Image Line Record - Continued

Byte

Bit

Item

Description

15 - 18

19

20

21

RIM

MOD91

MOD10

MOD8

SCLK readout of the 1st minor frame of this line.

22- 80

MIPS Physical Recording Words

59 ASCII characters which define the recording and validation devices, software version and CPU used to write this record and the data on which it was recorded. A detailed explanation of this field is provided in F.3.

81 - 82

Format ID

16-bit corrected telemetry format ID from the minor frame of this line.

83

Input Type

Decimal value:

0: S/C Flight Data MOS

1: PTM Data

2: Ext. Simulation

3: S/C Flight Data Test

4: Internal Simulation

5-255: Not used

84

0

1

2

3

4

5

6

7

SFDU data

WBDL data

SDR tape

IDR tape

EDR

Realtime

APB

Not used

Input source=1 if present in record.

85

Allowed Sync Code Errors

The number of sync code errors allowed in frame synching.

86

Sync Code Err

The total number of bits in the sync code of the minor frame for this line which deviate from the standard sync code.

Table F-2. Phase 1 Image Line Record - Continued

Byte

Bit

Item

Description

87 - 98

SSI LRS

SSI LRS packet. Present only for the first line of each MOD91 count. Otherwise zero.

99 - 100

Last Pixel ID

Element position (1-800) of the last pixel in this line not artificially set to zeroes or interpolated by MIPS processing. Set to zero for missing lines.

101 - 102

0 - 13

Sync error

Sync Status

Total number of bits in the 64-bit frame id which deviate from the "correct" bits for that frame.

Sync status for each minor frame:

00= fully synched (leading and trailing frame ID)

01= partial sync (leading but no trailing frame ID)

11= unsynched

103- 106

0 - 1

2 - 3

4 - 5

....

24 - 25

26 - 31

BLOCK 0

BLOCK 1

BLOCK 2

....

BLOCK 12

Filler

Number of truncated bits per block due to data compression. 2 bits/block, 13 blocks/line. Each contains 64 pixels except last one which contain 32 pixels.

107 - 108

Truncated

Total number of pixels truncated at end of line due to data compression.

109 - 110

Version

Catalog version for identical images.

111 - 112

SNR

GCF symbol signal to noise ratio

113

DSN ID

As defined in GLL-820-13/OPS-6-8.

114 - 115

Line Number

Image line number, 1-800.

116

R/S Overflow

Reed/Solomon overflow error flag.

1 = Overflow occurred

117 - 199

Reserved

Table F-2. Phase 1 Image Line Record - Continued

Byte

Bit

Item

Description

200 - 599

600 - 999

or

200 - 999

Pixel Data

Filler

or

Pixel Data

400 8-bit unsigned pixel values (summation mode only).

Set to zero (summation mode only).

800 8-bit unsigned pixel values.

200 - 999

or

200 - 1799

Pixel Data

or

Pixel Data

400 16-bit signed pixel values, radiometrically corrected (summation mode only).

800 16-bit signed pixel values, radiometrically corrected.

F.3 MIPS Physical Recording WORDS

Table F-3 below describes the structure of the MIPS physical recording words. All fields are in ASCII.

Table F-3. MIPS Physical Recording Words

Bytes

Item

Description

8

OS

Operating system version number "Vxxx.yyy". Eight ASCII characters

6

G_TYPE

Generating device "_MTAO:", etc.

2

G_ID

Generating device "A0", "A1", etc.

8

G_VOL

Tape Label, ASCII

8

Reserved

2

V_ID

Validation ID, "A0", "A1", etc.

8

CPU

CPU name, "MIPL1", MIPL2", etc.

11

DATE

Generation date "DD-MMM-YYYY"

F.4 Phase 1 Telemetry Format ID

Table F-4 below lists the telemetry formats and their Phase 1 downlink data rates. Entries in boldface type indicate SSI data telemetry formats.

Table F-4. Phase 1 Telemetry Formats

Telemetry Format Number

Mnemonic

Downlink Data Rate

Telemetry Format Number

Mnemonic

Downlink Data Rate

0

LPB

7.68 Kbps

16

HPW

115.2 Kbps

1

EHR

1.2 K bps

17

HIM

115.2 Kbps

2

BPB

16.8 Kbps

18

HCM

115.2 Kbps

3

MPB

28.8 Kbps

19

LRS

7.68 Kbps

4

XPW

67.2 Kbps

20

MPW

28.8 Kbps

5

XCM

67.2 Kbps

21

PW8

806.4 Kbps

6

XED

67.2 Kbps

22

IM8

806.4 Kbps

7

XPB

80.64 Kbps

23

AI8

806.4 Kbps

8

XPN

80.64 Kbps

24

PW4

403.2 Kbps

9

XRW

115.2 Kbps

25

IM4

403.2 Kbps

10

HPB

134.4 Kbps

26

---

---

11

HPJ

134.4 Kbps

27

---

---

12

HPW

134.4 Kbps

28

---

---

13

HCJ

134.4 Kbps

29

ESS

40 bps

14

MPP

28.8 Kbps

30

ELS

10 bps

15

MPR

28.8 Kbps

Appendix G

SSI GROUND CALIBRATION LABEL

The VICAR label has additional differences between Phase I and Phase II. For flight labels, the only difference is the addition of keyword/value pairs which relate to the new telemetry structure. Even for Phase I files, there was a distinction between Flight and Ground Calibration images. The Ground Calibration images have not been modified and retain their original format. That format is described in this appendix.

SSI ground calibration label: The ground-calibration label is generated by program VGLLOG, which reads tapes generated by the Galileo Sensor Test Set (STS) and converts the file to standard VICAR image format.

LAB01=GLL/SSI S/N=F29 LEVEL=SUBSYSTEM 10:59:15 MAY 19, 1985 FRAME61 C

LAB02=TEST=LIGHT TRANSFER C TARGET=TUNG L SOURCE=LC 70VR FR.RATE=8 2/3 C

LAB03=EXP=0 MSEC(***) GAIN=1(400K) PNI= BPM=OFF FILTER=0(CLR) C

LAB04=BARC=OUT(RAT) SUM=OFF EXPAND=OFF IN=GL0353/61 OUT=GC1109/61 C

LAB05= CCDTF=119 CCDTC=50 INN=** +50VDC=** +15VDC=** C

LAB06=-15VDC=** +10VDC=** +5VDC=** -5VDC=** CCDHEV=** BLSCV=** C

LAB07=ADCRFV=** VDD=** VREF=** VCC=** VEF=** ROPT=** C

LAB08=DESCRIPTOR=DARK FRAME, 8 C, 8 2/3 SEC, 100K, INVERTED L

NLABS=8

The ground calibration label follows a convention used to support old label formats originally used on the IBM (before 1984). The project labels are stored as label items LAB01, LAB02, LAB03, etc. Each LABXX item consists of a 72-character ASCII strings. The 71st character is a label type flag used by some programs (e.g. MASKV) to control which labels are displayed or

printed. The last character in each string is a 'C' (for continue) or 'L' (for last). However, note that the additional label item NLABS should be used to indicate how many project labels are present.

LABEL ITEM

DESCRIPTION

S/N=F29

CCD identifier (F29=flight unit)

LEVEL=SUBSYSTEM

Test level (component or subsystem)

FRAME61

Frame number (0-99)

TEST=LIGHT TRANSFER

Test name (16 characters)

TARGET=TUNG

Target name (6 characters)

SOURCE=LC

70VR Light source/veeder-root

FR.RATE=60 2/3

Frame rate (sec)

EXP=51200.00 MSEC(EXT)

Exposure time (msec), extended or normal

GAIN=1(400K)

Gain state (1-4)

PNI=NOR

Parallel clock (INV=inverted, NOR=normal)

BPM=OFF

Blem-protect (ON or OFF)

FILTER=3(VIO)

Filter position: 0(CLR), 1(GRN), 2(RED), 3(VLT), 4(756), 5(968), 6(727), 7(889)

BARC=OUT(RAT)

Data compressor ON or OUT, (RAT=rate control,IP=information preserving, OFF=compressor off)

SUM=OFF

Summation-mode (ON or OFF)

EXPAND=OFF

(obsolete field)

IN=GL0353/61

Input STS tape/filenumber

OUT=GC1109/61