Statistics – Computation
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aubu.reptr....b&link_type=abstract
Final Report Auburn Univ., AL. Dept. of Aerospace Engineering.
Statistics
Computation
Asteroids, Comets, Navigation, Rendezvous Guidance, Terminal Guidance, Algorithms, Computer Programs, Computerized Simulation, Kalman Filters, Solar Electric Propulsion
Scientific paper
A terminal guidance and navigation scheme developed in earlier work was modified and evaluated for a solar electric propulsion rendezvous mission to comet Encke. The scheme is intended for autonomous, on-board use. The guidance algorithm is based on optimal control theory and minimizes the time integrated square of thrust acceleration. The navigation algorithm employs a modified Kalman filter set in measurement variables. Random sequences were generated to simulate measurement errors, and the evaluation was conducted with detailed numerical computations which include actual motions of spacecraft and comet. The evaluations showed that the scheme attains rendezvous and maintains station after rendezvous within less than 10 km for estimated best measurements and within less than 100 km for estimated worst measurements. The measurements required are angles, range, and range rate. Angles and range appear to be absolutely necessary; range rate is not as strong a measurement type, and further modifications of the filter will allow a scheme that does not require the rate measurements.
Bennett Gloria Adame
Pitts R. G.
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