Computer Science
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980fmet.symp.....p&link_type=abstract
In NASA. Goddard Space Flight Center Fifth Ann. Flight Mech./Estimation Theory Symp. 9 p (SEE N81-11070 02-13)
Computer Science
Autonomous Navigation, Horizon Scanners, Navigation Instruments, Space Navigation, Spacecraft Position Indicators, Airborne/Spaceborne Computers, Autonomous Spacecraft Clocks, Computerized Simulation, Instrument Errors, Kalman Filters, Position Errors, Solar Sensors, State Vectors
Scientific paper
A relatively simple autonomous system which would use horizon crossing indicators, a sun sensor, a quartz oscillator, and a microprogrammed computer is discussed. The sensor combination is required only to effectively measure the angle between the centers of the Earth and the Sun. Simulations for a particular orbit indicate that 2 km r.m.s. orbit determination uncertainties may be expected from a system with 0.06 deg measurement uncertainty. A key finding is that knowledge of the satellite orbit plane orientation can be maintained to this level because of the annual motion of the Sun and the predictable effects of Earth oblateness. The basic system described can be updated periodically by transits of the Moon through the IR horizon crossing indicator fields of view.
Hendrickson H. T.
Pease G. E.
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