G - Physics – 01 – C
Patent
G - Physics
01
C
343/69
G01C 21/00 (2006.01) G01C 21/02 (2006.01) G09B 9/52 (2006.01)
Patent
CA 1266110
Abstract STAR SIGHTINGS BY SATELLITE FOR IMAGE NAVIGATION Stars are sensed by one or more instruments (1, 2) on board a three-axis stabilized satellite, for purposes of assisting in image navigation. A star acquisition computer (64), which may be located on the earth, commands the instrument mirror (33, 32) to slew just outside the limb of the earth or other celestial body around which the satellite is orbiting, to look for stars that have been cataloged in a star map stored within the computer (64). The instrument (1, 2) is commanded to dwell for a period of time equal to a star search window time, plus the maximum time the instrument (1, 2) takes to complete a current scan, plus the maximum time it takes for the mirror (33, 32) to slew to the star. When the satellite is first placed in orbit, and following first stationkeeping and eclipse, a special operation is performed in which the star-seeking instrument (1, 2) FOV is broadened. The elevation dimension can be broadened by performing repetitive star seeks; the azimuth dimension can be broadened by lengthening the commanded dwell times.
525036
Ekman Donald E.
Kamel Ahmed A.
Savides John
Zwirn Gerald J.
Gowling Lafleur Henderson Llp
Space Systems/loral Inc.
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