 
 
DS1 Solar Array Orientation CK File for 2001
===========================================================================
 
     Created by Boris Semenov, NAIF/JPL, Wed Oct 1 09:10:06 PDT 2003
 
 
Orientation Data in the File
--------------------------------------------------------
 
     This file contains orientation and angular rate data for the Deep
     Space 1 (DS1) Solar Array 1 (SA) and Solar Array 2 (SA2) frames. The
     orientation of the 'DS1_SA1' is given with respect to the
     'DS1_SC_BUS' frame; orientation of the 'DS1_SA2' is also given
     with respect to the 'DS1_SC_BUS' frame. The NAIF IDs
     for the 'DS1_SA1' and 'DS1_SA2' frames are -30201 and -30202.
 
 
Status
--------------------------------------------------------
 
     This file was created by NAIF for archiving with the Planetary Data
     System (PDS) from daily CK files produced by NAIF, JPL.
 
 
Pedigree
--------------------------------------------------------
 
     The original CK files used to create this file were officially
     delivered to the DS1 project by the NAIF Team. These files contained
     the solar array frames orientation with respect to the spacecraft
     frame. The orientation was computed on the ground from the
     solar array gimbal angles extracted from the channelized telemetry
     sent down by the spacecraft. The individual daily CK files were merged
     together at the time of archiving.
 
     A table containing the complete list of original CK files from which
     data were included in this file is provided at the end of these
     comments.
 
 
Approximate Time Coverage
--------------------------------------------------------
 
     This file covers the following interval:
 
          Coverage Begin UTC       Coverage End UTC
          ------------------------ ------------------------
          2001-MAY-07 00:01:49.442 2001-DEC-18 20:51:43.852
 
     This file is a type 3 CK file which provides linear interpolation
     between orientation data points extracted from telemetry. Such
     interpolation is not applied to the whole coverage of the file but
     only inside intervals where enough orientation telemetry data was
     available and orientation data points were close to each other in time
     for such interpolation to make sense.
 
     The nominal gimbal angle time spacing in the telemetry stream varied
     from one to many seconds between adjacent data points. Considering
     that the array gimbals cannot rotate very fast and that the highest
     accuracy of the SA orientation knowledge is unlikely to be needed in
     any application, the duration of the longest interval over which the
     data may be interpolated was set to 300 seconds. For all requests for
     data falling between two adjacent data points separated by more than
     300 seconds the SPICELIB CK readers will return a logical flag
     stating "POINTING NOT FOUND".
 
     A table containing the complete list of valid interpolation intervals
     in the file segments is provided at the end of these comments.
 
 
Angular Rate Data Note
--------------------------------------------------------
 
     Since DS1 s/c engineering telemetry did not contain angular rate data
     for the gimbals, the angular rates stored in this file were computed
     from the orientation information. The angular rate for each
     orientation point was computed as average of two rates -- constant
     angular rate that would rotate from previous point to that point and
     constant angular rate that would rotate from that point to the next
     point.
 
     Because angular rates stored in two adjacent points in most cases are
     not the same, and CK readers linearly interpolate between them, the
     output angular rates in general will never be constant between any two
     adjacent data points stored in the file.
 
 
Usage Note
--------------------------------------------------------
 
     In order to use this file an DS1 SCLK file containing coefficients
     mapping DS1 on-board time to ET must be loaded into a user's program.
 
     Loading an DS1 Frames Kernel (FK) containing information that SPICE
     software need to combine gimbal orientations together will allow a
     user to get the combined orientation through the high level SPICE
     Toolkit interfaces.
 
 
Related Kernels
--------------------------------------------------------
 
     This file was created using the following LSK and SCLK files:
 
        naif0007.tls
        ds1_sclkscet_00071.tsc
 
 
Contacts
--------------------------------------------------------
 
     If you have any question regarding this data contact NAIF at JPL:
 
        Charles H. Acton, Jr
        (818)-354-3869
        chuck.acton@jpl.nasa.gov
 
        Boris V. Semenov
        (818)-354-8136
        boris.semenov@jpl.nasa.gov
 
 
Appendix 1: List of the original CK files
--------------------------------------------------------
 
ds1_sa_ck_2001-05-07.bc
ds1_sa_ck_2001-05-08.bc
ds1_sa_ck_2001-05-09.bc
ds1_sa_ck_2001-09-09.bc
ds1_sa_ck_2001-09-10.bc
ds1_sa_ck_2001-09-11.bc
ds1_sa_ck_2001-09-12.bc
ds1_sa_ck_2001-09-13.bc
ds1_sa_ck_2001-09-14.bc
ds1_sa_ck_2001-09-15.bc
ds1_sa_ck_2001-09-16.bc
ds1_sa_ck_2001-09-17.bc
ds1_sa_ck_2001-09-18.bc
ds1_sa_ck_2001-09-19.bc
ds1_sa_ck_2001-09-20.bc
ds1_sa_ck_2001-09-21.bc
ds1_sa_ck_2001-09-22.bc
ds1_sa_ck_2001-09-23.bc
ds1_sa_ck_2001-09-24.bc
ds1_sa_ck_2001-09-25.bc
ds1_sa_ck_2001-09-26.bc
ds1_sa_ck_2001-09-27.bc
ds1_sa_ck_2001-09-28.bc
ds1_sa_ck_2001-09-29.bc
ds1_sa_ck_2001-09-30.bc
ds1_sa_ck_2001-10-01.bc
ds1_sa_ck_2001-10-02.bc
ds1_sa_ck_2001-10-03.bc
ds1_sa_ck_2001-10-04.bc
ds1_sa_ck_2001-10-05.bc
ds1_sa_ck_2001-10-06.bc
ds1_sa_ck_2001-10-07.bc
ds1_sa_ck_2001-10-08.bc
ds1_sa_ck_2001-10-09.bc
ds1_sa_ck_2001-10-10.bc
ds1_sa_ck_2001-10-11.bc
ds1_sa_ck_2001-10-12.bc
ds1_sa_ck_2001-10-13.bc
ds1_sa_ck_2001-10-14.bc
ds1_sa_ck_2001-10-15.bc
ds1_sa_ck_2001-10-16.bc
ds1_sa_ck_2001-10-17.bc
ds1_sa_ck_2001-10-18.bc
ds1_sa_ck_2001-10-19.bc
ds1_sa_ck_2001-10-20.bc
ds1_sa_ck_2001-10-21.bc
ds1_sa_ck_2001-10-22.bc
ds1_sa_ck_2001-10-23.bc
ds1_sa_ck_2001-10-24.bc
ds1_sa_ck_2001-10-25.bc
ds1_sa_ck_2001-10-26.bc
ds1_sa_ck_2001-10-27.bc
ds1_sa_ck_2001-10-28.bc
ds1_sa_ck_2001-10-29.bc
ds1_sa_ck_2001-10-30.bc
ds1_sa_ck_2001-10-31.bc
ds1_sa_ck_2001-11-01.bc
ds1_sa_ck_2001-11-02.bc
ds1_sa_ck_2001-11-03.bc
ds1_sa_ck_2001-11-04.bc
ds1_sa_ck_2001-11-05.bc
ds1_sa_ck_2001-11-06.bc
ds1_sa_ck_2001-11-07.bc
ds1_sa_ck_2001-11-08.bc
ds1_sa_ck_2001-11-09.bc
ds1_sa_ck_2001-11-10.bc
ds1_sa_ck_2001-11-11.bc
ds1_sa_ck_2001-11-12.bc
ds1_sa_ck_2001-11-13.bc
ds1_sa_ck_2001-11-14.bc
ds1_sa_ck_2001-11-15.bc
ds1_sa_ck_2001-11-16.bc
ds1_sa_ck_2001-11-17.bc
ds1_sa_ck_2001-11-18.bc
ds1_sa_ck_2001-11-19.bc
ds1_sa_ck_2001-11-20.bc
ds1_sa_ck_2001-11-21.bc
ds1_sa_ck_2001-11-22.bc
ds1_sa_ck_2001-11-23.bc
ds1_sa_ck_2001-11-24.bc
ds1_sa_ck_2001-11-25.bc
ds1_sa_ck_2001-11-26.bc
ds1_sa_ck_2001-11-27.bc
ds1_sa_ck_2001-11-28.bc
ds1_sa_ck_2001-11-29.bc
ds1_sa_ck_2001-11-30.bc
ds1_sa_ck_2001-12-01.bc
ds1_sa_ck_2001-12-02.bc
ds1_sa_ck_2001-12-03.bc
ds1_sa_ck_2001-12-04.bc
ds1_sa_ck_2001-12-05.bc
ds1_sa_ck_2001-12-06.bc
ds1_sa_ck_2001-12-07.bc
ds1_sa_ck_2001-12-08.bc
ds1_sa_ck_2001-12-09.bc
ds1_sa_ck_2001-12-10.bc
ds1_sa_ck_2001-12-11.bc
ds1_sa_ck_2001-12-12.bc
ds1_sa_ck_2001-12-13.bc
ds1_sa_ck_2001-12-14.bc
ds1_sa_ck_2001-12-15.bc
ds1_sa_ck_2001-12-16.bc
ds1_sa_ck_2001-12-17.bc
ds1_sa_ck_2001-12-18.bc
 
 
Appendix 2: Interpolation Intervals in the File
--------------------------------------------------------
 
     The information in this section has been generated by running CKBRIEF
     utility program using -dump -utc command line options.
 
 
CKBRIEF Version: 2.0.0, 2001-05-16. SPICE Toolkit Version: N0056.
 
 
Summary for: ds1_sa_2001.bc
 
Segment No.: 1
 
Object:  -30201
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-MAY-07 00:01:49.442 2001-MAY-09 02:48:16.448 Y
  2001-MAY-09 02:53:26.448 2001-MAY-09 21:46:48.451 Y
  2001-SEP-09 00:00:26.356 2001-SEP-17 20:40:54.824 Y
  2001-SEP-17 20:48:18.825 2001-SEP-18 19:01:13.938 Y
  2001-SEP-18 19:10:50.939 2001-SEP-19 20:31:14.097 Y
  2001-SEP-20 00:00:51.120 2001-SEP-21 01:10:51.257 Y
  2001-SEP-21 03:15:43.268 2001-SEP-21 03:15:43.268 Y
  2001-SEP-21 06:20:43.285 2001-SEP-24 12:57:08.712 Y
  2001-SEP-24 13:02:08.713 2001-SEP-24 16:02:08.729 Y
  2001-SEP-24 16:10:08.730 2001-SEP-25 17:43:38.869 Y
  2001-SEP-25 17:55:08.870 2001-SEP-25 20:41:08.885 Y
  2001-SEP-25 21:24:08.889 2001-SEP-25 22:05:38.893 Y
  2001-SEP-25 22:13:38.893 2001-SEP-26 21:11:39.018 Y
  2001-SEP-27 00:00:09.033 2001-SEP-28 02:16:32.176 Y
  2001-SEP-28 02:26:36.177 2001-SEP-28 07:41:11.206 Y
  2001-SEP-28 07:54:28.207 2001-SEP-28 14:52:14.245 Y
  2001-SEP-29 00:00:10.295 2001-OCT-03 20:34:35.929 Y
  2001-OCT-03 20:42:00.929 2001-OCT-11 19:06:50.965 Y
 
Segment No.: 2
 
Object:  -30201
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-OCT-11 19:06:50.965 2001-OCT-17 20:13:26.754 Y
  2001-OCT-17 20:20:51.755 2001-DEC-18 20:51:43.852 Y
 
Segment No.: 3
 
Object:  -30202
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-MAY-07 00:01:49.442 2001-MAY-09 02:48:16.448 Y
  2001-MAY-09 02:53:26.448 2001-MAY-09 21:47:19.451 Y
  2001-SEP-09 00:00:26.356 2001-SEP-17 20:40:54.824 Y
  2001-SEP-17 20:48:18.825 2001-SEP-18 19:01:13.938 Y
  2001-SEP-18 19:10:50.939 2001-SEP-19 20:33:21.098 Y
  2001-SEP-20 00:00:51.120 2001-SEP-21 01:10:51.257 Y
  2001-SEP-21 03:15:43.268 2001-SEP-21 03:15:43.268 Y
  2001-SEP-21 06:20:43.285 2001-SEP-24 12:57:08.712 Y
  2001-SEP-24 13:02:08.713 2001-SEP-24 16:02:08.729 Y
  2001-SEP-24 16:10:08.730 2001-SEP-25 17:43:38.869 Y
  2001-SEP-25 17:55:08.870 2001-SEP-25 20:41:08.885 Y
  2001-SEP-25 21:24:08.889 2001-SEP-25 22:05:38.893 Y
  2001-SEP-25 22:13:38.893 2001-SEP-26 21:11:39.018 Y
  2001-SEP-27 00:00:09.033 2001-SEP-28 02:16:32.176 Y
  2001-SEP-28 02:26:36.177 2001-SEP-28 07:41:11.206 Y
  2001-SEP-28 07:54:28.207 2001-SEP-28 14:52:14.245 Y
  2001-SEP-29 00:00:10.295 2001-OCT-03 20:34:35.929 Y
  2001-OCT-03 20:42:00.929 2001-OCT-11 19:06:20.965 Y
 
Segment No.: 4
 
Object:  -30202
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-OCT-11 19:06:20.965 2001-OCT-17 20:13:26.754 Y
  2001-OCT-17 20:20:51.755 2001-DEC-18 20:51:43.852 Y
 
 
