Results of the application of tropospheric corrections from different troposphere models for precise GPS rapid static positioning |
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Authors: | Pawe? Wielgosz Jacek Paziewski Andrzej Krankowski Krzysztof Kroszczyński Mariusz Figurski |
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Institution: | (1) Department of Geomatics Engineering, University of Calgary, 2500 University Drive NW, T2N1N4 Calgary, AB, Canada;(2) GPS-Met Observing Systems Branch, Demonstration Division, NOAA Forecast Systems Laboratory, 325 Broadway R/FS3, Boulder, CO 80305-3328, USA |
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Abstract: | In many surveying applications, determination of accurate heights is of significant interest. The delay caused by the neutral
atmosphere is one of the main factors limiting the accuracy of GPS positioning and affecting mainly the height coordinate
component rather than horizontal ones. Estimation of the zenith total delay is a commonly used technique for accounting for
the tropospheric delay in static positioning. However, in the rapid static positioning mode the estimation of the zenith total
delay may fail, since for its reliable estimation longer observing sessions are required. In this paper, several troposphere
modeling techniques were applied and tested with three processing scenarios: a single baseline solution with various height
differences and a multi-baseline solution. In specific, we introduced external zenith total delays obtained from Modified
Hopfield troposphere model with standard atmosphere parameters, UNB3m model, COAMPS numerical weather prediction model and
zenith total delays interpolated from a reference network solution. The best results were obtained when tropospheric delays
derived from the reference network were applied. |
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