Acquisition, pointing and tracking performance of the Hubble Space Telescope fine guidance sensors

Details Acquisition, pointing and tracking performance of the Hubble Space Telescope fine guidance sensors Acquisition, pointing and tracking performance of the Hubble Space Telescope fine guidance sensors

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1697..236e&link_type=abstract

In: Acquisition, tracking, and pointing VI; Proceedings of the Meeting, Orlando, FL, Apr. 22-24, 1992 (A94-12578 02-63), p. 236-

Computer Science

Performance

Data Acquisition, Guidance Sensors, Hubble Space Telescope, Pointing Control Systems, Satellite Tracking, Satellite-Borne Instruments, Calibrating, Least Squares Method, Orbital Space Tests

Scientific paper

The three fine guidance sensors (FGSs) on board the HST have been operated extensively since the observatory was launched in April, 1990. The FGSs, each capable of measuring angles as small as 0.003 arcsec, provide required fine pointing information to the HST's pointing control system and are intended to serve as astrometry instruments. On-orbit data have shown that the acquisition, pointing and tracking performance of the FGSs in most cases meets, and of these sometimes exceeds, requirements. The versatility of the FGS digital control electronics to adapt to the unexpected conditions imposed on the sensors by the telescope spherical aberration and by solar panel jitter is discussed. There is encouragement from both on-orbit tests and analytical studies that the FGSs can accommodate the current telescope characteristics. Improvements to guide star acquisitions within the FGSs and to target acquisitions within science instruments have been accomplished with the internal distortion calibration of each FGS and with the alignment calibration between sensors. Techniques used in the calibration process and the resulting improvements in acquisitions are presented.

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