PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
OBJECT = TEXT
INTERCHANGE_FORMAT = ASCII
PUBLICATION_DATE = 2000-02-07
NOTE = "C-Kernel Information"
END_OBJECT = TEXT
END
General information about SPICE C-kernels
=========================================
In the SPICE system, pointing data for an instrument platform, or
for a specific instrument, are stored C-kernels. The pointing of
a platform or an instrument is often expressed in terms of a
transformation matrix from some standard inertial reference frame
to a instrument-fixed frame. In the past, the instrument was often
a camera, and the transformation was thus dubbed the ``C-matrix'';
hence the choice of C as the name for the pointing kernel.
The data contained in C-kernel files can be accessed and manipulated
by a collection of FORTRAN 77 subroutines which are part of the
SPICELIB library. These subroutines can be integrated into user
application programs. The SPICE system toolkit for a number of
computer platforms or information regarding how it can be obtained
is located in the SOFTWARE subdirectory of the main directory of
this dataset.
To use C-kernels, a Spacecraft Clock Kernel (SCLK) is required.
Also, for C-Kernels containing orientation of a project-defined
frames, a Frame Definitions File is required.
Refer to the CK.REQ document provided with the toolkit or available
from the NAIF Node of PDS if SPICE toolkit is not included with
this data set to get more information on how to access C-kernel
data.
MGS C-kernels contained on this volume
======================================
The following MGS C-kernels are provided on this volume (only name
portion of the file name is shown on the right; the extension of all
file names is ".BC"):
-- MGS Spacecraft Orientation CK Files:
MGS_SC_CRUS CK file covering portions of the Cruise
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and partially correcting orientation
data for time bias;
MGS_SC_AB1 CK file covering the whole Aerobraking-1
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and partially correcting orientation
data for time bias;
MGS_SC_SPO1 CK file covering the whole Science
Phasing Orbit 1 (SPO-1) phase of the
mission, created by merging regular daily
CK files from SC Team at LMA and
partially correcting orientation data for
time bias;
MGS_SC_SPO2 CK file covering the whole Science
Phasing Orbit 2 (SPO-2) phase of the
mission, created by merging regular daily
CK files from SC Team at LMA and
partially correcting orientation data for
time bias;
MGS_SC_AB2 CK file covering the whole Aerobraking-2
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and partially correcting orientation
data for time bias;
-- MGS Solar Array Orientation CK Files:
MGS_SA_CRUS CK file covering portions of the Cruise
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and correcting -Y array orientation
data for 1 second time bias;
MGS_SA_AB1 CK file covering the whole Aerobraking-1
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and correcting -Y array orientation
data for 1 second time bias;
MGS_SA_SPO1 CK file covering the whole Science
Phasing Orbit 1 (SPO-1) phase of the
mission, created by merging regular daily
CK files from SC Team at LMA and
correcting -Y array orientation data
for 1 second time bias
MGS_SA_SPO2 CK file covering the whole Science
Phasing Orbit 2 (SPO-2) phase of the
mission, created by merging regular daily
CK files from SC Team at LMA and
correcting -Y array orientation data for
1 second time bias
MGS_SA_AB2 CK file covering the whole Aerobraking-2
phase of the mission, created by merging
regular daily CK files from SC Team at
LMA and correcting -Y array orientation
data for 1 second time bias
MGS_SA_HINGE_STEADY -Y Solar Array broken hinge deflection CK
file for the MAG Team.
-- MGS High Gain Antenna Orientation CK Files:
MGS_HGA_HINGE HGA deployment hinge rotation CK file.
MGS_HGA_GIMBAL_STOWED HGA Gimbals rotation CK file for gimbals
in stowed position.
The C-Kernels included on this CD-ROM contain actual orientation data
in most cases based on values obtained from the spacecraft engineering
telemetry.
Kernel File Details
===================
The most detailed description of the data in a binary CK file is
provided in metadata included inside the comment area of the file.
This information can be viewed using utility programs COMMNT and
SPACIT included into the NAIF Toolkit.
Contact Information
===================
Regarding MGS project specific information provided in this
data set and for general information about SPICE system:
Charles H. Acton, Jr,
(818)-354-3869,
Chuck.Acton@jpl.nasa.gov,
or
Boris Semenov
(818)-354-8136
Boris.Semenov@jpl.nasa.gov
address:
Navigation and Ancillary Information Facility (NAIF)
Jet Propulsion Laboratory
MS 301-125L
4800 Oak Grove Drive
Pasadena CA 91109 USA