Abstract
1 Introduction
2 Reference Frames and the Sagnac Effect
3 GPS Coordinate Time and TAI
4 The Realization of Coordinate Time
5 Relativistic Effects on Satellite Clocks
6 TOPEX/POSEIDON Relativity Experiment
7 Doppler Effect
8 Crosslink Ranging
9 Frequency Shifts Induced by Orbit Changes
10 Secondary Relativistic Effects
11 Applications
12 Conclusions
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