Regional Precise Troposphere Delay Modeling Based on Spherical Cap Harmonic Analysis

Abstract

Abstract:

The troposphere delay is one of the major error resources for the accuracy of GPS positioning. Empirical models were unable to provide sufficient accuracy for the precise positioning with increasing demand of precision, the Continuously Operating Reference Stations (CORS) built around the world shed lights on constructing more precise tropospheric delay model. Based on the analysis of drawbacks of common real-time regional tropospheric delay models, a new regional real-time troposphere model based on spherical cap harmonic analysis (SCHA) is proposed in this paper. Comparative analysis between SCHA model and four-parameter model show that internally coincident precision of the new model is obvious improved (RMS < 5 mm); its externally coincident precision increases about 50% (RMS < 1 cm). SCHA model could describe special variations of troposphere more reasonably and is adequate to regional real-time troposphere delay modeling for large areas.

Key words: spherical cap harmonic function, zenith troposphere total delay, fitting model, CORS

CLC Number:

P228

References

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