The Gravity Probe B (GP-B) spacecraft was successfully launched at 9:57:24 PDT on April 20, 2004. The science phase of the mission ended on August 15th, 2005. The experiment will undergo calibrations until the Dewar runs out of helium, causing the temperature of the Gyroscope Readout System to rise above its critical temperature of 7.1 kelvin. As of September 26th, 2005, the GP-B spacecraft has been on-orbit for 524 days. A pair of Stanford University modified Trimble Advanced Navigation System (TANS) Vector III receivers installed on the vehicle have provided position, velocity, and time measurements during the mission. This paper details efforts to use the GPS receivers to determine spacecraft attitude. This paper will also discuss GP-B's GPS performance during the mission. We conclude with a brief discussion of possible follow-up missions for the GP-B spacecraft.
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