Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994fmet.symp..109b&link_type=abstract
In NASA. Goddard Space Flight Center, Flight Mechanics/Estimation Theory Symposium, 1994 p 109 (SEE N94-35605 11-13)
Physics
Calibrating, Drift Rate, Gyroscopes, Gyroscopic Stability, Hubble Space Telescope, Data Acquisition, Spacecraft Stability, Telemetry
Scientific paper
The routine on-orbit calibration of the Hubble Space Telescope (HST) rate gyro assemblies (RGA's) has depended on several related algorithms for drift rate bias calibration. The gyros have exhibited time-varying biases, which must be regularly corrected to maintain pointing stability. Currently, gyro drift parameters are uplinked to the spacecraft every 1-2 days for low rate mode and every 7 days for high rate mode. In order to minimize the impact of frequent calibrations on the HST science schedule, we have refined the gyro calibration algorithms and data collection schemes to reduce the amounts of telemetry data and processing time required for accurate bias calibration. We present a review of the evolution of the gyro calibration algorithms, with particular attention to what we have called the long-baseline bias (LBBIAS) technique, and describe the relative success of these methods in maintaining spacecraft stability.
Boia John J.
Gakenheimer Martin F.
Welter Gary L.
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