Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975inna...21..333h&link_type=abstract
(Institute of Navigation, Annual Meeting, 30th, San Diego, Calif., June 25-27, 1974.) Navigation, vol. 21, Winter 1974-1975, p.
Astronomy and Astrophysics
Astronomy
Drift Rate, Error Analysis, Gyroscopes, Inertial Reference Systems, Oao, Satellite Attitude Control, Data Reduction, Diurnal Variations, Pitch (Inclination), Random Noise, Roll, Yaw
Scientific paper
The Inertial Reference Unit (IRU) used in NASA's Orbiting Astronomical Observatory uses three single degree of freedom, floated, rate-integrating gyros operated in binary, pulse-restrained torque loops to provide an inertial attitude reference for the spacecraft's attitude control system. The drift rates observed on these inertial grade gyros during the 1 1/2 year of in-orbit operation have remained within a band of 16 arcsec per hour peak-to-peak. When the effects of known disturbances are considered, the standard deviation of drift rate appears to approach one arcsec per hour. Included in this paper are a brief description of the OAO and IRU, a summary of the data reduction programs used to calibrate the IRU in orbit, and some thoughts on how gyros with good long-term drift stability could be applied to future spacecraft such as the Large Space Telescope and Earth Observatory Satellite.
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