Performance Comparison between Different Klobuchar Model Parameters

doi:10.13485/j.cnki.11-2089.2014.0176

Abstract

Abstract:

To GPS single-frequency user, the ionospheric delay is one of the most important sources of errors. GPS uses Klobuchar model to correct the ionospheric delay whose corrections come from 370 groups of constants derived from empirical models and historical data. Currently stations distributed all over the world can provide ionosphere monitoring results with high precision, why GPS doesn’t broadcast Klobuchar model parameters calculated with observed data? This article focuses on this question. Firstly estimating the precision of predicted global ionosphere maps, COPG, provided by Center for Orbit Determination in Europe (CODE). Secondly we fit the Klobuchar model parameters with COPG. Then we assess the parameters’ precision with global ionosphere maps provided by IGS. Finally we do single point positioning using different Klobuchar parameters to evaluate their influences on GPS single-frequency users. Results show that restricted by Klobuchar model with 8 parameters, precision of parameters fitted using global observed data is just equal with GPS broadcast parameters, both around 55%. On the other hand, precision of model parameters fitted using data on the north of geomagnetic latitude 45oS is much higher, which arrives about 65%, but it performs no better in positioning of single-frequency users. Results in this article provide reference to ionosphere modeling of our nation.

Key words: Klobuchar model, GPS, ionosphere delay, GIM

CLC Number:

P228.4

WANG Fei WU Xiaoli LI Yuxiang. Performance Comparison between Different Klobuchar Model Parameters[J]. Acta Geodaetica et Cartographica Sinica, 2014, 43(11): 1151-1157.

References

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