Computation of a High-Precision GPS-Based Troposphere Product by the USNO

Sharyl Byram, Christine Hackman, Jeffrey Tracey

Abstract:	In addition to contributing to the IGS ultra rapid and rapid GPS products, the USNO Analysis Center (AC) has undertaken the task of computing the high-precision IGS final troposphere product, expanding its GPS product family in July 2011. A precise point position (PPP) estimation of the zenith path delay (ZPD) and the North and East gradient components is performed using the Bernese GPS Version 5.0 software [4]. In an effort to measure the quality of the final troposphere product produced by the USNO with this setup, a test was performed by processing 18 IGS reference stations and comparing the result to the final troposphere product published by the IGS over a time span of 25 days. The zenith path delay estimates in comparison to the IGS product seem to agree overall with most of the stations averaging less than 3 mm in standard deviation with an average mean near 1 mm for the 25 day period. The gradient component estimates show more variability in the standard deviation from station to station, however the average mean is near zero.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	572 - 578
Cite this article:	Byram, Sharyl, Hackman, Christine, Tracey, Jeffrey, "Computation of a High-Precision GPS-Based Troposphere Product by the USNO," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 572-578.
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