Galileo triple-frequency uncombined precise orbit determination: model and quality assessment

doi:10.11947/j.AGCS.2020.20200320

Abstract

Abstract: Multi-frequency signals have brought new opportunities and challenges to global navigation satellite system (GNSS) precise data processing. In this contribution, the uncombined (UC) observation model suitable for multi-frequency precise orbit determination (POD) was derived, and the double-differenced constraining strategy for multi-frequency UC ambiguity was given. Afterwards, Galileo POD was carried out by using the observation data of 150 multi-GNSS experiment (MGEX) stations. Different solutions using E1/E5a double-frequency, E1/E5b double-frequency and E1/E1a/E5b triple-frequency observations based on UC model and the traditional ionosphere free (IF) model respectively are applied to generate Galileo orbits.The comparison with external precise orbit products, orbit boundary discontinuities comparison and satellite laser ranging (SLR) validation were used to evaluate the orbit accuracy of different solutions. The results showed that the UC model and IF model having comparable orbit accuracy for double-frequency solutions.The differences of orbit accuracy between UC and IF model are within 1 mm, and the differences of the estimated satellite clock and SLR residuals are within 0.01 ns and 2 mm, respectively. When triple-frequency observations (E1/E5a/E5b) were used, the accuracy of float UC and float IF solutions can be improved by 1~2 mm compared to that using E1/E5b observations.

Key words: Galileo, uncombined model, ionospheric-free combination, preciseorbit determination

CLC Number:

P228

LI Xingxing, HUANG Jiande, YUAN Yongqiang, LI Jie, LIU Chengbo, ZHU Yiting. Galileo triple-frequency uncombined precise orbit determination: model and quality assessment[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(9): 1120-1130.

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