ABSTRACT
Global Positioning System (GPS) is the only system today able to show ones ownposition on the earth any time in any weather, anywhere. This paper addresses this
satellite based navigation system at length. The different segments of GPS viz. space
segment, control segment, user segment are discussed. In addition, how this amazing
system GPS works, is clearly described. The various errors that degrade the performance
of GPS are also included. DIFFERENTIAL GPS, which is used to improve the accuracy
of measurements, is also studied. The need, working and implementation of DGPS are
discussed at length. Finally, the paper ends with advanced application of GPS.
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