Computer Science – Performance
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stoc.iafcs....r&link_type=abstract
IAF, International Astronautical Congress, 36th, Stockholm, Sweden, Oct. 7-12, 1985. 9 p.
Computer Science
Performance
Autonomous Navigation, Optical Measurement, Refraction, Satellite Navigation Systems, Signal Analysis, Stellar Luminosity, Atmospheric Attenuation, Atmospheric Models, Computerized Simulation, Covariance
Scientific paper
The measurement accuracy and availability are evaluated for an autonomous navigation system which performs onboard estimation of the attitude and position of a low-orbit satellite and is based on stellar refraction measurements. The limitation of the refraction principle is the minimum height to be used. The linearized measurement equation for covariance analysis and the Kalman filtering procedure is given. The availability of the refraction measurement is determined by studying the albedo and latitude constraints. The covariance analysis which evaluates the performance of the navigation filter is described. A simulation of the entire system is conducted to confirm the results of covariance analysis; the simulation reveals that stellar refraction measurements are accurate and virtually independent of attitude estimates.
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