Computer Science – Performance
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981spie..265..355l&link_type=abstract
In: Shuttle pointing of electro-optical experiments; Proceedings of the Seminar, Los Angeles, Calif., February 10-13, 1981. (A81
Computer Science
Performance
Guidance Sensors, Gyroscopic Stability, Pointing Control Systems, Space Infrared Telescope Facility, Space Shuttle Payloads, Charge Coupled Devices, Computer Techniques, Cryogenic Cooling, Design Analysis, Focal Plane Devices, Mirrors, Spaceborne Telescopes, Star Distribution
Scientific paper
The Shuttle Infrared Telescope Facility (SIRTF) is being designed as a 0.85 m cryogenically cooled telescope capable of a three order of magnitude improvement over currently available infrared instruments. The SIRTF requires that the image at the focal plane be stabilized to better than 0.25 arcsec with an absolute accuracy of 1.0 arcsec. Current pointing-mount performance simulations indicate that neither of these requirements can be met without additional stabilization. The SIRTF pointing and control system will utilize gyro outputs, star field position measurements from a focal plane fine guidance sensor, and a steerable secondary mirror to provide the necessary stabilization and pointing control. The charge coupled device fine guidance sensor tracks multiple stars simultaneously and, through the use of multistar processing algorithms in a high performance microcomputer, generates three-axis attitude errors and gyro-drift estimates to correct the pointing-mount gyros. A high-bandwidth feedforward loop, driven directly from the pointing-mount gyro package, controls the steering mirror in order to correct disturbances not compensated for by the pointing-mount control system. A prototype design for the SIRTF pointing and control system is described in detail. Performance analyses made using a digital simulation of the pointing and control system as well as experimental data obtained in laboratory and field test measurements are presented.
Barrows W. F.
Lorell Kenneth R.
Matsumoto Y. T.
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