GPS Pseudorange Measurement Calibration

Michael D. Menn, Xuandzung T. Tran

Abstract:	This report makes an argument for upgrading the GPS control segment algorithms to include using recent history to characterize repetitive error in its rapid measurements. That characterization would then be used to correct current measurements. Candidate algorithms to accomplish this will be presented. Their effectiveness will be evaluated in terms of the accuracy of compacted code measurements that are input, after certain deterministic corrections are made, at 15 minute marks to the Kalman filter that performs orbit and clock determination. We show that the root mean square error of those measurements can be reduced by over 50 percent. Note that measurement calibration would be implemented outside the higher level code that performs estimation, etc. We anticipate that the principal benefits of the improved measurement accuracy will be reduced zero and low age of data signal in space error and, potentially, improved integrity monitoring. Although these are discussed briefly, our study did not include evaluation of performance improvement in these areas so assessment of accuracy improvement is limited to the measurement domain.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	2209 - 2220
Cite this article:	Menn, Michael D., Tran, Xuandzung T., "GPS Pseudorange Measurement Calibration," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 2209-2220.
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