Computer Science
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sppc.agar.....m&link_type=abstract
In AGARD Spacecraft Pointing and Position Control 13 p (SEE N82-20208 11-12)
Computer Science
Airborne/Spaceborne Computers, Celestial Navigation, Digital Navigation, Satellite Attitude Control, Sextants, Space Shuttle Payloads, Spaceborne Telescopes, Angles (Geometry), Autonomous Navigation, Covariance, Equipment Specifications, Error Analysis, Gimbals, Mirrors, Monte Carlo Method, Navigation Aids, Onboard Equipment, Prisms, Space Navigation, Tracking (Position)
Scientific paper
The Space Sextant - Autonomous Navigation Attitude Reference System (SS-ANARS), a spacecraft subsystem that has the integrated capability of on-board orbit determination with on-board attitude determination is described. The Space Sextant is a gimballed-two telescope included angle measurement device that is driven by an on-board computer to measure the angles between celestial bodies, as seen from a spacecraft, to an accuracy of 1 arc second. Orbit determination with the system is achieved by measuring the included angles between brighter stars and the limbs of the Moon and Earth, and processing these angle measurements through a Kalman filter with an on-board digital computer. Spacecraft position accuracy from 800 to 1200 feet is determined for any Earth orbit. Attitude determination relative to the celestial sphere is determined with the same device to an accuracy of less than 1 arc second by measuring the included angles between the brighter stars and a reference platform consisting of a mirror and a Porro prism. The SS-ANARS described has progressed through critical technology development, a proof of concept model, a laboratory model, and a flight demonstration system. This flight demonstration system is to be flown as a sortie payload on the Space Transportation System (Space Shuttle) to prove its autonomous-integrated orbit and attitude determination capabilities.
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