The New Tropospheric Product of the International GNSS Service

Sung H. Byun, Yoaz E. Bar-Sever and Gerd Gendt

Abstract:	The International GNSS Service (IGS) has been producing tropospheric product that are based on combined contributions from several IGS Analysis Centers (AC). These products contain time series of total zenith delay from a subset of the IGS network of ground-based GPS receivers. The IGS has recently started exploring a new method for the derivation of the tropospheric products. Each new product consists of a time series of total zenith troposphere delay at 5 minutes intervals from practically all IGS ground sites. Total zenith delay values are estimated with the precise point positioning (PPP) approach, using the IGS combined GPS orbit and clock solutions, and RINEX files generated by each site. We compare this new approach for generating the IGS tropospheric products with the previous approach, which was based on explicit combination of total zenith delay contributions from the IGS ACs. The new approach enables the IGS to rapidly generate highly accurate and highly reliable total zenith path delay (ZPD) time series for many hundreds of sites, thus increasing the utility of the products to weather modelers, climatologists, and GPS analysts. In this paper we describe this new method, and discuss issues of accuracy, quality control, utility of the new products and assess its benefits.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	241 - 249
Cite this article:	Byun, Sung H., Bar-Sever, Yoaz E., Gendt, Gerd, "The New Tropospheric Product of the International GNSS Service," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 241-249.
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