Test of Technique to Aviod FGS1 Stalls

Physics

Scientific paper

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Hst Proposal Id #6843 Engineering

Scientific paper

The proposed test will demonstrate whether a short periodof Coarse Track will dissipate the material accumulated duringthe offset maneuver, and hence avoid the lost of lock and lossof science. The test will acquire a pair of guide stars usingFGS1, slew to the target location, comand a GS reacquisitionwhich will naturally provide 10 seconds of Coarse Track, andthen execute two small angle maneuvers that will cause reversalsof the bearing direction. The first of these two SAMS should befree of a reversal bump, the second should have one. This testwill be run 3 times and 3 control tests will also be run.The controls will be identical, but will NOT include thereacquisitions. These should each have reversal bumps.

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