A High-precision Correction Method of Ultra-rapid Ephemeris Clock Bias Prediction for GPS Block IIR-M Satellites

doi:10.11947/j.AGCS.2016.20160017

Abstract

Abstract: A high-precision correction algorithm based on the block IIR-M satellites is proposed to improve the precision of IGS ultra-rapid predicted (IGU-P) products. In order to ensure that the real-time precise point positioning (RTPPP) with high positioning accuracy could come true, it is attempted to get the difference between the first prediction data and the last epoch of IGS ultra-rapid observed (IGU-O), and then to compute the value and determine the direction of accuracy revised value based on influence of the degree of residual value to difference sequence of IGU-O. The numerical examples with the data set of 19 IGU files showed that the prediction accuracy of proposed method was superior to three basic models and IGU-P within 6 hours, the rate of improved accuracy range from 3.48% to 6.13%, and average prediction accuracy of corresponding models were, in order,0.599 ns,0.570 ns and 0.531 ns.

Key words: Block IIR-M satellites, clock bias prediction, accuracy correction, adaptive dynamic method, IGU-P, IGU-O

CLC Number:

P228

CAI Chenglin, HE Chengwen, WEI Zhaochuan. A High-precision Correction Method of Ultra-rapid Ephemeris Clock Bias Prediction for GPS Block IIR-M Satellites[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(7): 782-788.

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