Long Period Systematic Errors In GPS Measurements

Shane Nelson

Abstract:	Improvements in the quality of GPS receivers in recent years have significantly reduced the “random” component of GPS measurement error. This has allowed more detailed analysis of the systematic errors manifested in GPS measurements. Applied Research Laboratories, The University of Texas, ARL:UT, has investigated long period (~1 hour) systematic trends in the two frequency corrected range minus phase combination formed with data from modern commercial geodetic GPS receivers. Specifically, these trends represent a slowly changing, non-ionospheric, difference between the range and phase measurements. These trends are shown to be sensitive to antenna design and are attributed primarily to code multipath manifested in very long periods. It is shown that trends in measurement error can also be induced by receiver temperature gradients but that these trends, common to all satellites in track, do not affect double difference observables and can be mitigated through simple temperature stabilization.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1155 - 1163
Cite this article:	Nelson, Shane, "Long Period Systematic Errors In GPS Measurements," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1155-1163.
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