PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 178 FILE_RECORDS = 6342 INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR" TARGET_NAME = "MARS" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" DATA_SET_ID = "MGS-M-RSS-5-SDP-V1.0" PRODUCT_ID = "OCCLOGM4.TAB" PRODUCT_RELEASE_DATE = 2003-06-23 DESCRIPTION = "This file contains summary information for each radio occultation opportunity during the third occultation season in MGS Mapping. Data are organized as a PDS TABLE object with 16 columns of fixed widths. Columns include start/stop times for data acquisition, antenna number, sample rate, filter width, DSP mode, bit resolution, record length, number of records, number of missing records, maximum signal-to-noise ratio, RSR file name, SOE file name, and comments. Columnar data and delimiters require 176 bytes; these are followed by an ASCII carriage-return and line feed, making the total line length equal to 178 bytes. Orbit numbers in the keywords immediately below (START_ORBIT_NUMBER and STOP_ORBIT_NUMBER) as well as in the COMMENTS column of the table itself reflect the MGS Project decision to reinitialize orbit numbers to 1 at the beginning of the MGS Mapping Phase. This file was produced by the Mars Global Surveyor Radio Science Team, under the direction of G. Leonard Tyler." START_TIME = 2001-12-13T02:20:00 STOP_TIME = 2003-06-19T23:21:00 START_ORBIT_NUMBER = 12359 STOP_ORBIT_NUMBER = 19134 PRODUCT_CREATION_TIME = 2003-06-23T17:55:00 PRODUCER_FULL_NAME = "RICHARD A. SIMPSON" PRODUCER_INSTITUTION_NAME = "STANFORD UNIVERSITY" PRODUCT_VERSION_TYPE = "PRELIMINARY" PRODUCER_ID = "MGS RST" ^OCCLOG_TABLE = "OCCLOGM4.TAB" OBJECT = OCCLOG_TABLE NAME = "OCCULTATION LOG M4" ROWS = 6342 COLUMNS = 17 ROW_BYTES = 178 ROW_SUFFIX_BYTES = 0 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The OCCLOG table contains a summary line from each radio occultation opportunity. Each line contains 176 bytes of data followed by an ASCII carriage-return line-feed pair. Character strings are enclosed by double quotes, fields are delimited by commas; neither is counted in defining either START_BYTE or BYTES." OBJECT = COLUMN NAME = "START TIME" COLUMN_NUMBER = 1 DATA_TYPE = TIME START_BYTE = 1 BYTES = 19 DESCRIPTION = "The date and time of the first DSP sample in the data file. Format is YYYY-MM-DDThh:mm:ss where YYYY is the 4-digit year MM is the 2-digit month DD is the 2-digit day-of-month hh is the 2-digit hour mm is the 2-digit minute ss is the 2-digit second and time reference system is UTC. Time may be blank if no data were collected." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "STOP TIME" COLUMN_NUMBER = 2 DATA_TYPE = TIME START_BYTE = 21 BYTES = 19 DESCRIPTION = "The date and time of the last integer second time tag in the data file. Format is YYYY-MM-DDThh:mm:ss where YYYY is the 4-digit year MM is the 2-digit month DD is the 2-digit day-of-month hh is the 2-digit hour mm is the 2-digit minute ss is the 2-digit second and time reference system is UTC. May be blank or partly blank if no data were collected." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "DSN TRACKING MODE" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_INTEGER START_BYTE = 41 BYTES = 1 FORMAT = "I1" DESCRIPTION = "DSN tracking mode is 1 if the spacecraft is transmitting with no uplink frequency reference, 2 is there is an uplink reference from the receiving station, and 3 of there is an uplink reference from another ground station." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "UPLINK DSS" COLUMN_NUMBER = 4 DATA_TYPE = ASCII_INTEGER START_BYTE = 43 BYTES = 2 FORMAT = "I2" DESCRIPTION = "The number of the DSN antenna used to transmit the uplink frequency reference, or 0 if none. See ANTENNA NUMBER (below) for more information." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ANTENNA NUMBER" COLUMN_NUMBER = 5 DATA_TYPE = ASCII_INTEGER START_BYTE = 46 BYTES = 2 FORMAT = "I2" DESCRIPTION = "The number of the DSN antenna used to collect the open-loop occultation data. 70-m antennas include DSS 14, 43, and 63; 34-m high-efficiency (HEF) antennas include DSS 15, 45, and 65. 34-m beam-waveguide (BWG) antennas include DSS 25, 34, and 54." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "RSR ID" COLUMN_NUMBER = 6 DATA_TYPE = ASCII_INTEGER START_BYTE = 49 BYTES = 2 FORMAT = "I2" DESCRIPTION = "The identifier of the Radio Science Receiver (RSR) within the DSN complex. A number between 1 and 16." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "RSR SUBCHANNEL ID" COLUMN_NUMBER = 7 DATA_TYPE = ASCII_INTEGER START_BYTE = 52 BYTES = 1 FORMAT = "I1" DESCRIPTION = "The identifier of the Radio Science Receiver subchannel. A number between 1 and 4." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SAMPLE RATE" COLUMN_NUMBER = 8 DATA_TYPE = ASCII_INTEGER START_BYTE = 54 BYTES = 5 FORMAT = "I5" UNIT = "KILOSAMPLE PAIRS PER SECOND" DESCRIPTION = "The sampling rate for the channel in the data file. Complex (I/Q) samples were taken; this is the rate of I/Q pairs. Nominal rate for MGS radio occultations was 2 ksps. Left blank or set to 0 if no data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "BIT RESOLUTION" COLUMN_NUMBER = 9 DATA_TYPE = ASCII_INTEGER START_BYTE = 60 BYTES = 2 FORMAT = "I2" UNIT = "BIT" DESCRIPTION = "The number of bits in each individual I and Q sample. Nominally 16 for the sampling rate of 2 ksps (32 bits for the I/Q pair). Left blank or set to 0 if no data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "RECORD LENGTH" COLUMN_NUMBER = 10 DATA_TYPE = ASCII_INTEGER START_BYTE = 65 BYTES = 5 FORMAT = "I5" UNIT = "BYTE" DESCRIPTION = "The number of bytes in each logical record in the file. For nominal operations usually 8260 bytes of which 260 bytes were header and the remaining 8000 bytes contained 2000 16-bit I and 16-bit Q pairs. Left blank or set to 0 if no data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "NUMBER OF RECORDS" COLUMN_NUMBER = 11 DATA_TYPE = ASCII_INTEGER START_BYTE = 69 BYTES = 6 FORMAT = "I6" UNIT = "N/A" DESCRIPTION = "The number of records in the file. Number of records multiplied by the record length (Column 8) should equal the file size in bytes. Left blank or set to 0 if no data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MAXIMUM SIGNAL-TO-NOISE RATIO" COLUMN_NUMBER = 12 DATA_TYPE = ASCII_REAL START_BYTE = 76 BYTES = 5 FORMAT = "F5.1" UNIT = "DECIBEL PER HERTZ" DESCRIPTION = "The maximum carrier-to-noise level during times when the spacecraft was not occulted by the planet. Based on 60- second power spectra with 5 Hz resolution (typically), calculated by program FNDLOOK. Left blank or set to 0 if no data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SYSTEM TEMPERATURE" COLUMN_NUMBER = 13 DATA_TYPE = ASCII_REAL START_BYTE = 82 BYTES = 6 FORMAT = "F6.2" UNIT = "KELVIN" DESCRIPTION = "The system temperature of the open-loop receiving system, read from displays at the Jet Propulsion Laboratory, usually during ingress. Set to 0 or left blank if unknown." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ODR FILE NAME" COLUMN_NUMBER = 14 DATA_TYPE = CHARACTER START_BYTE = 90 BYTES = 12 FORMAT = "A12" UNIT = "N/A" DESCRIPTION = "The name of the file containing RSR records (headers plus data samples). Files have names of the form YDDDhhmm.RSR where Y is the 1-digit year of the first data sample DDD is the 3-digit day-of-year of the first data sample hh is the 2-digit hour of the first data sample mm is the 2-digit minute of the first data sample (in cases where more than one file has the same YDDDhhmm the additional names are modified by converting the second digit in mm to a letter. Left blank if data acquisition was unsuccessful." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SOE FILE NAME" COLUMN_NUMBER = 15 DATA_TYPE = CHARACTER START_BYTE = 105 BYTES = 16 FORMAT = "A16" UNIT = "N/A" DESCRIPTION = "The name of the controlling Sequence of Events file when the data were collected. This is the original file name, as it appeared in the MGS Central Data Base. Typical file names had the form mmNNNc.vv.tsoe where mm identifies this as a Mars Mapping SOE NNN is the Mapping Cycle number c is the planning version for the Mapping Cycle (a letter) vv is the version of the SOE SOE files in the MGS Radio Science Team server are renamed according to to an 8.3 file naming convention. But it may be possible to search for the original file name using either the MGS RST data base or index files. Left blank if not known or if irrelevant (data acquisition was not successful)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "QUALITY" COLUMN_NUMBER = 16 DATA_TYPE = CHARACTER START_BYTE = 124 BYTES = 3 FORMAT = "A3" UNIT = "N/A" DESCRIPTION = "Data quality indicator. First character indicates expectation from observation: A HGA, scheduled occultation; high-quality science expected B Lower quality data expected (e.g., spacecraft using LGA) C Non-occultation observation (e.g., USO test) D Observation opportunity, but not scheduled Second character indicates results: 0 No data, or data irreparably corrupted 1 Data badly corrupted; no present plan to attempt recovery 2 Seriously degraded data, from causes beyond control (e.g., weather) 3 Seriously degraded data from causes associated with equipment 4 Minor degradations (SNR 6 dB low, frequency residuals, missing records, baseline unstable, uplink ramping) 5 No known problems Third character gives main cause for degradation (if any): a all OK b baseline unstable or too short d DSP failure e equipment failure (other than DSP or GDS) f frequency instabilities/residuals g data lost in ground data system (GDS) l incorrect level setting (attenuation) m missing records n low carrier-to-noise, or unstable noise level o operator error p POCA r ripple (spectral or temporal) s sawtooth frequency residual t tuning or timing (orbit) problem u spurs w weather x not applicable y unknown z multiple problems" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "COMMENTS" COLUMN_NUMBER = 17 DATA_TYPE = CHARACTER START_BYTE = 130 BYTES = 46 FORMAT = "A46" UNIT = "N/A" DESCRIPTION = "Terse comments, usually indicating the number of the occultation or any problems with the data. Most comment fields begin with nnnnnx:m where nnnnn is the 5-digit orbit number, where orbit 1 was the first orbit in the MGS Mapping phase x denotes ingress (i) or egress (e) m is a quality indicator for any observed surface echo - no surface echo expected (e.g., test data) 0 none seen in processing to date 1 hint of a surface echo 2 weak but persistent surface echo 3 moderately strong, often with amplitude variations 4 very strong 5 extremely strong (among top 1 percent)" END_OBJECT = COLUMN END_OBJECT = OCCLOG_TABLE END