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Space Shuttle Navigation: Difference between revisions
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→Usage in FG
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[[File:Shuttle avionics spec22.jpg|600px|STRK/COAS display of the Space Shuttle]] | [[File:Shuttle avionics spec22.jpg|600px|STRK/COAS display of the Space Shuttle]] | ||
During normal operations, items 3 and 4 (STAR TRK) should be selected. Items 5 or 6 allow one camera to be used for proximity operation navigation instead (see there), whereas items 9 and 10 switch the tracker off. | |||
Whether a star is seen by the tracker or not is indicated following S PRES with a '*', the ID of the star is given as TRK ID, the angular correction to the current state vector as ΔANG. The upper right section shows a list of the three latest observations which can be cleared with item 20. | |||
If a star tracker happens to point at the sun, shutters will automatically close to protect the optics, in which case shutter status will change from 'OP' to 'CL'. Whenever the Shuttle maneuvers, the angular motion of the cameras across the sky will be too fast to allow tracking and the status of the trackers will change to 'HI RATE'. If the star trackers go out of alignment and can no longer reliably identify stars, the status will change to 'FALSE TRK'. | |||
Usually the star tracker should require minimal intervention and perform its function fine on its own. | |||