Other
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aiaa.confx....s&link_type=abstract
AIAA, Space Programs and Technologies Conference, Huntsville, AL, Mar. 24-27, 1992. 13 p. Research supported by U.S. Navy.
Other
Command And Control, Horizon Scanners, Orbit Calculation, Satellite Attitude Control, Satellite Rotation, Spin Stabilization, Autonomous Navigation, Earth Orbital Environments, Onboard Data Processing, Spacecraft Instruments
Scientific paper
An approach to earth sensing for spinning satellites is presented which provides full-sky (4pi steradian) earth coverage from LEO to above GEO with a single sensor. The commandable rate scanner, a modified conical earth sensor, has significant advantages over traditional earth sensors. The sensor scan pattern can be selected to meet mission needs, and is uniquely characterized by the sensor-to-spacecraft spin ratio. A sensor spin rate control circuit keeps the spin ratio constant based on spacecraft spin rate measurements from a sun sensor or other source. The CRS is insensitive to significant nutation and sensor biases. Data rates of several hundred measurements per minute in LEO make it possible to ignore some systematic errors, eliminating complex processing algorithms. It is concluded that the CRS can provide accurate, fully autonomous spacecraft attitude and orbit determination based on sun and moon sensing.
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