Abstract:By selecting 16 iGMAS station observation data for 10 days from January 23, 2018, the observation data quality of third-generation Beidou satellite (BDS-3) and the orbit accuracy of BDS-3 satellites satellite are evaluated using BDS-only precise orbit determination (POD). In the data quality analysis, two stations with different receiver types are selected to evaluate the signal-to-noise ratio (SNR), pseudorange noise and multipath error for Beidou new and old signals, comparing them with GPS Block ⅡF and Galileo FOC satellite. The pseudorange noises of all stations are calculated and analyzed. The results show that the signal-to-noise ratio of B1I and B3I for BDS-3 satellite is slightly stronger than those of BDS-2 satellites. The noise multipaths are considerable between BDS-2 and BDS-3 satellites, both of which are at the magnitude of 0.1m. BDS-3 satellites do not have satellite-induced code pseudorange variations. As to the new signals, the B1C/L1/E1 SNR is strongest for GPS satellites, and the Galileo is equivalent to the BDS satellite. The SNR among three GNSS systems in B2a/L5/E5a and B2b/E5b frequencies are basically equivalent. In terms of noise and multipath, B1C/L1/E1 GPS is superior to BDS and Galileo, with the magnitude of 0.1m. B2a/L5/E5a and B2b/E5b are basically the same, both at the magnitude of 0.1m. In BDS-only POD tests, strategies with/without GEO satellite and ECOM five or nine parameters were respectively compared, and the satellite laser ranging data are used for independent check. The results show that the orbits with GEO satellite and selecting ECOM five parameters can receive the best accuracy. The average orbit determination precisions of C19 satellite with 7 overlapping arcs are 32, 16 and 8 cm in along, cross and radial directions, respectively.
ZENG Tian,JIA Xiaolin,SUI Lifen et al. Initial Evaluation of Beidou-3 Satellite Data Quality and Single System Precise Orbit Determination[J]. jgg, 2019, 39(11): 1165-1170.