This thesis outlines the objectives, structure, and operation of the software designed to meet requirements set forth by Development Test Objective 700-6 for the space shuttle Discovery mission STS-51. The primary goals were the comparison of state vector information produced by GPS sources and Discovery's inertial navigation computer, and the real-time display of relative position and rendezvous information between Discovery and a retrievable shuttle pallet satellite. In-flight and postflight examination of GPS and inertial state vectors provided the first step in the development of GPS as an on-orbit navigation system. Analysis of the Orbiter and target satellite state vectors produced real-time graphical displays of operationally significant data to the Discovery's flight crew during rendezvous and proximity operations. STS-51 DTO 700-6, State Vector Comparison, Relative Motion Plotting, Spacecraft Rendezvous and Proximity Operations.


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