Estimation of Troposphere Decorrelation Using the Combined Zenith-dependent Parameter

Yong Won Ahn, Don Kim, Peter Dare, James Park

Abstract:	For dual-frequency GPS observables, one of the largest error sources affecting high-precision positioning solutions arises from the unmodelled troposphere. Even for the short baseline, the resultant solution can be degraded once there is strong anomaly effect due to the troposphere. The problem can be more difficult as the troposphere parameters are highly correlated with the height component. In order to decorrelate those parameters, we introduce a new approach in this paper. Instead of two separate parameters, we combine them into one common parameter as they are both zenith-dependent parameters. We have examined the feasibility of our proposed method for estimating the positioning and residual troposphere parameters. Data collected in Southern Texas, USA, on August 21, 2005 over a baseline length of around 7.8 km was reprocessed. The positioning solution from the new combined proposed parameter has been tested, evaluated, and compared with that from the conventional estimation method. By using the methodology, significant positioning improvement was achieved in the horizontal component as well as the vertical component. Also, the estimated troposphere parameters using the combined parameter are compared with that from the uncombined parameter.
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:	261 - 270
Cite this article:	Ahn, Yong Won, Kim, Don, Dare, Peter, Park, James, "Estimation of Troposphere Decorrelation Using the Combined Zenith-dependent Parameter," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 261-270.
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