M01 Solar Array Orientation CK File for Cruise, Part 3 =========================================================================== Created by Boris Semenov, NAIF/JPL, January 7, 2002 Orientation Data in the File -------------------------------------------------------- This file contains orientation and angular rate data for the Mars'01 Odyssey (M01) Solar Array (SA) Inner and Outer gimbal frames. The orientation of the 'M01_SA_INNER_GIMBAL' is given with respect to the 'M01_SPACECRAFT' frame; orientation of the 'M01_SA_OUTER_GIMBAL' is given with respect to the 'M01_SA_INNER_GIMBAL' frame. The NAIF IDs for the 'M01_SA_INNER_GIMBAL' and 'M01_SA_OUTER_GIMBAL' frames are -53311 and -53312. Status -------------------------------------------------------- This file was created by NAIF for archiving with the Planetary Data System (PDS) from daily CK files produced by NAIF Team at JPL, Pasadena. Pedigree -------------------------------------------------------- The original CK files used to create this file were officially delivered to the M01 project by the NAIF Team. These files contained the inner gimbal frame orientation with respect to the spacecraft frame and the outer gimbal frame orientation with respect to the inner gimbal 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 to provide coverage for a complete or a portion of a particular mission phase. 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 third part of the Cruise phase of the mission: COVERAGE BEGIN TIME (UTC): 2001-09-01T00:00:13.710 COVERAGE END TIME (UTC): 2001-10-23T23:59:59.090 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 a few seconds between adjacent data points. Considering that the array gimbal 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 M01 s/c engineering telemetry did not contain angular rate data for the gimbal, 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 M01 SCLK file containing coefficients mapping M01 on-board time to ET must be loaded into a user's program. Loading an M01 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 with LSK file naif0007.tls and M01 SCLK file ORB1_SCLKSCET.00017.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 -------------------------------------------------------- m01_sa_2001-09-01.bc m01_sa_2001-09-02.bc m01_sa_2001-09-03.bc m01_sa_2001-09-04.bc m01_sa_2001-09-05.bc m01_sa_2001-09-06.bc m01_sa_2001-09-07.bc m01_sa_2001-09-08.bc m01_sa_2001-09-09.bc m01_sa_2001-09-10.bc m01_sa_2001-09-11.bc m01_sa_2001-09-12.bc m01_sa_2001-09-13.bc m01_sa_2001-09-14.bc m01_sa_2001-09-15.bc m01_sa_2001-09-16.bc m01_sa_2001-09-17.bc m01_sa_2001-09-18.bc m01_sa_2001-09-19.bc m01_sa_2001-09-20.bc m01_sa_2001-09-21.bc m01_sa_2001-09-22.bc m01_sa_2001-09-23.bc m01_sa_2001-09-24.bc m01_sa_2001-09-25.bc m01_sa_2001-09-26.bc m01_sa_2001-09-27.bc m01_sa_2001-09-28.bc m01_sa_2001-09-29.bc m01_sa_2001-09-30.bc m01_sa_2001-10-01.bc m01_sa_2001-10-02.bc m01_sa_2001-10-03.bc m01_sa_2001-10-04.bc m01_sa_2001-10-05.bc m01_sa_2001-10-06.bc m01_sa_2001-10-07.bc m01_sa_2001-10-08.bc m01_sa_2001-10-09.bc m01_sa_2001-10-10.bc m01_sa_2001-10-11.bc m01_sa_2001-10-12.bc m01_sa_2001-10-13.bc m01_sa_2001-10-14.bc m01_sa_2001-10-15.bc m01_sa_2001-10-16.bc m01_sa_2001-10-17.bc m01_sa_2001-10-18.bc m01_sa_2001-10-19.bc m01_sa_2001-10-20.bc m01_sa_2001-10-21.bc m01_sa_2001-10-22.bc m01_sa_2001-10-23.bc Appendix 2: Interpolation Intervals in the File -------------------------------------------------------- 2001-09-01T00:00:13.710 2001-09-04T04:35:54.248 2001-09-04T06:07:07.200 2001-09-08T22:24:58.681 2001-09-08T22:58:34.682 2001-09-08T23:31:06.684 2001-09-08T23:38:50.683 2001-09-10T06:42:50.762 2001-09-11T00:00:10.805 2001-09-14T14:19:55.205 2001-09-14T15:17:31.209 2001-09-16T06:09:31.101 2001-09-16T08:30:51.114 2001-09-19T13:33:28.160 2001-09-19T13:54:00.166 2001-09-19T14:07:52.259 2001-09-19T14:13:28.165 2001-09-20T06:08:56.218 2001-09-20T06:24:56.314 2001-09-20T21:34:48.280 2001-09-20T21:51:18.294 2001-09-22T14:43:20.358 2001-09-22T14:55:52.360 2001-09-26T21:40:56.414 2001-09-26T21:47:02.429 2001-09-29T21:58:32.327 2001-09-29T22:18:00.330 2001-09-29T23:01:44.331 2001-09-29T23:22:48.325 2001-10-04T22:55:20.151 2001-10-04T23:18:16.149 2001-10-14T21:19:57.968 2001-10-14T21:32:05.983 2001-10-15T21:18:53.903 2001-10-15T21:32:05.922 2001-10-16T23:47:25.835 2001-10-17T00:06:53.833 2001-10-17T20:07:09.786 2001-10-17T20:13:49.782 2001-10-19T05:46:53.693 2001-10-19T09:32:29.778 2001-10-19T21:13:33.647 2001-10-19T21:25:41.662 2001-10-21T16:12:45.524 2001-10-21T16:18:05.524 2001-10-23T00:52:37.702 2001-10-23T00:58:37.689 2001-10-23T23:59:59.090