Other
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgcd...17..614g&link_type=abstract
Journal of Guidance, Control, and Dynamics (ISSN 0731-5090), vol. 17, no. 3, p. 614-618
Other
Attitude Control, Attitude Indicators, Gyroscopes, Inertial Reference Systems, Iue, Mechanical Devices, Satellite Attitude Control, Solar Sensors, Spaceborne Telescopes, Redundant Components, Stabilization, System Failures
Scientific paper
The International Ultraviolet Explorer is a geosynchronous orbiting telescope launched by NASA January 26, 1978, and operated jointly by NASA and the European Space Agency. The spacecraft was built with six gyroscopes to provide an inertial reference system for spacecraft attitude and control and with prime and redundant mechanical panoramic attitude sensors for coarse attitude determination. Following the failure of the fourth gyroscope in 1985, a new attitude control system was uplinked to the spacecraft using a fine sun sensor and the two remaining gyros for three-axis stabilization. By 1985 both panoramic attitude sensors had failed, and an alternate method developed for coarse attitude determination was not applicable to the newly installed control system. We present here a new method of attitude recovery that uses the relative motion of the sun with respect to the inertial reference provided by remaining two gyros and that has been employed since 1985. This general technique should be of use to other spacecraft where weight is critical or there is a desire to avoid mechanical devices.
Gilmozzi Roberto
Pitts Ronald E.
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