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Space Shuttle Navigation: Difference between revisions
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Like the star tracker, COAS operations are controlled from SPEC 22. | Like the star tracker, COAS operations are controlled from SPEC 22. | ||
[[File: | [[File:COAS_ST.jpg|800px|STRK/COAS display of the Space Shuttle]] | ||
To use the COAS, wait for the night portion of the orbit till the stars come out. You need some knowledge of the night sky to identify constellations and find the star you need. Pick one of the stars from the supported table and enter its index as item 21. | To use the COAS, wait for the night portion of the orbit till the stars come out. You need some knowledge of the night sky to identify constellations and find the star you need. Pick one of the stars from the supported table and enter its index as item 21. | ||
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If you are convinced that the COAS is okay, execute item 28 to update the state vector. If you want to start from scratch, execute item 20 which clears the star table and all COAS references. Usually, the star tracker should be back in working condition after a COAS procedure. | If you are convinced that the COAS is okay, execute item 28 to update the state vector. If you want to start from scratch, execute item 20 which clears the star table and all COAS references. Usually, the star tracker should be back in working condition after a COAS procedure. | ||
=== GPS === | === GPS === | ||