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Space Shuttle Navigation: Difference between revisions
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The basic characteristics of the navigational problem (including error propagation, sensor quality with respect to the propagated state, state vector corrections) are modeled in FG. | The basic characteristics of the navigational problem (including error propagation, sensor quality with respect to the propagated state, state vector corrections) are modeled in FG. | ||
== Orbital | == Orbital Navigation == | ||
In a stable orbit, attitude drift (relevant for e.g. antenna pointing) is usually more important than position drift. For attitude sensing, the Shuttle is equipped with two <b>star trackers</b>, augmented by the <b>Crew Optical Alignment System</b> (COAS). Position updates to the state vector come either from the GPS receivers or from remote-sensing the Shuttle via radar whenever it overflies a ground site and uplinking state vector corrections determined that way. | In a stable orbit, attitude drift (relevant for e.g. antenna pointing) is usually more important than position drift. For attitude sensing, the Shuttle is equipped with two <b>star trackers</b>, augmented by the <b>Crew Optical Alignment System</b> (COAS). Position updates to the state vector come either from the GPS receivers or from remote-sensing the Shuttle via radar whenever it overflies a ground site and uplinking state vector corrections determined that way. | ||