Shuttle Infrared Telescope Facility Pointing And Control System

Kenneth R. Lorell; William F. Barrows; Yutaka T. Matsumoto

doi:10.1117/12.959882

3 April 1981 Shuttle Infrared Telescope Facility Pointing And Control System

Kenneth R. Lorell, William F. Barrows, Yutaka T. Matsumoto

Proceedings Volume 0265, Shuttle Pointing of Electro-Optical Experiments; (1981) https://doi.org/10.1117/12.959882
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

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 arcseconds with an absolute accuracy of 1.0 arcsecond. 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.

Citation Download Citation

Kenneth R. Lorell, William F. Barrows, and Yutaka T. Matsumoto "Shuttle Infrared Telescope Facility Pointing And Control System", Proc. SPIE 0265, Shuttle Pointing of Electro-Optical Experiments, (3 April 1981); https://doi.org/10.1117/12.959882

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