Orbit determination and clock estimation via two ionosphere-free combinations of observation from BDS triple-frequency data and its application

doi:10.11947/j.AGCS.2020.20190237

Abstract

Abstract: The international GNSS monitoring and assessment system (iGMAS) and the multi-GNSS experiments (MGEX) receive BeiDou navigation signals on different frequencies. In this paper, orbit determination and clock estimation based on two ionosphere-free combinations of observation (B1/B3 and B1/B2) from BDS triple-frequency data is proposed. In this method, data of both networks from BeiDou 2nd generation (BDS-2), BeiDou 3rd generation test system (BDS-3e) and BeiDou 3rd generation global system (BDS-3g) can be processed uniformly in one program run, which can effectively improve data usage at one run, thereby improving parameter estimation accuracy. The GPS and BDS data of iGMAS and MGEX were collected for several days for testing. The results show that for the BDS-3e+BDS-2+GPS joint orbit determination, the orbit overlap RMS of the BDS MEO is 9.5 cm after using the triple-frequency two-combination method, which is 29% higher than the accuracy of traditional dual-frequency processing. The new method introduces a code bias parameter related to three frequencies of each involving BDS-2 satellite. The result shows values of the parameter are quite stable for continuous one-day solutions, which proves that the model is reliable. The new method is used for BDS-3g+BDS-3e+BDS-2+GPS joint orbit determination. The 6 BDS-3g MEO satellite orbit overlap RMS is 14.5 cm, and the clock error overlap RMS is 0.43 ns, which is equivalent to 15.1 cm and 0.49 ns of BDS-3e. The BDS precise point positioning (PPP) test was carried out. The results show that after adding the precise orbit and clock difference of the six MEOs of BDS-3g, the horizontal positioning accuracy of the station is 39.6 mm, and the zenith accuracy is 37.8 mm, which increases positioning accuracy by 11.1% than BDS-2 and BDS-3e satellites only.

Key words: two ionosphere-free combination from triple-frequency data from BDS, precise orbit determination, clock error estimation, BeiDou 3rd navigation satellite system

CLC Number:

P228

LI Jie, ZHANG Rongzhi, ZENG Guang, GONG Bing, WANG Chong, FANG Yanan, ZHU Jun, LI Junfeng, QIANG Wen. Orbit determination and clock estimation via two ionosphere-free combinations of observation from BDS triple-frequency data and its application[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(11): 1377-1387.

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