Fast and robust pointing and tracking using a second-generation star tracker

John Leif Joergensen; Andrew J. Pickles

doi:10.1117/12.308838

26 May 1998 Fast and robust pointing and tracking using a second-generation star tracker

John Leif Joergensen, Andrew J. Pickles

Proceedings Volume 3351, Telescope Control Systems III; (1998) https://doi.org/10.1117/12.308838
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

Second generation star trackers work by taking wide-angle optical pictures of star fields, correlating the image against a star catalogue in ROM, centroiding many stars to derive an accurate position and orientation. This paper describes a miniature instrument, fast and lightweight, including database and search engine. It can be attached to any telescope to deliver an accurate absolute attitude reference via a serial line. It is independent of encoders or control system, and works whenever it can see the sky. Position update rates in the range of 1 to 5 Hz enable closed-loop operations. The paper describes the instrument operational principles, and its application as an attitude reference unit for a telescope. Actual data obtained at the University of Hawaii's 0.6-m telescope are presented, and their utility for correcting mechanical alignment discussed. The system has great potential as a positioner and guider for (i) remotely operated optical telescopes, (ii) IR telescopes operating in dark clouds, and (iii) radio telescopes. Other application recommendations and the performance estimates are given.

Citation Download Citation

John Leif Joergensen and Andrew J. Pickles "Fast and robust pointing and tracking using a second-generation star tracker", Proc. SPIE 3351, Telescope Control Systems III, (26 May 1998); https://doi.org/10.1117/12.308838

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