Preliminary analysis to positioning precision and crustal movement of BDS-3 data recorded by the China seismic experiment site

doi:10.11947/j.AGCS.2024.20230044

Abstract

Abstract:

The BDS-3 navigation satellite system of China was completely accomplished in July 2020, then starting to provide services for global users. GNSS stations in the China seismic experiment site (CSES) have been receiving BDS-3 satellite data ever since, and accumulated observational data for more than 2 years, providing an important platform in acquiring observational data for the application of BDS-3 in exploring crustal movement in Sichuan-Yunan area. To assess the current precision of the BDS-3 positioning and its performance in crustal movement monitoring, we first evaluate the quality of BDS-3 observational data according to the relationship of multi-path effect and signal-to-noise ration with elevation angles. Using GAMIT/GLOBK (version 10.7), we have processed the simultaneously recorded BDS-3 and GPS data separately to obtain coordinate time series for each station. Fitting the time series of three coordinate components separately with a functional model which encompasses linear, annual, semi-annual and other terms by the maximum probability estimation method, we obtain velocity, amplitude and phase for E, N and U components of the coordinate time series. Furthermore, we evaluate the precision of BDS-3 and GPS by comparative analysis of the fitting results. Finally we discuss the possible factors which could influence the positioning precision of BDS-3, and regional features of the horizontal velocity field derived from BDS-3 observations. The results show that the quality of raw data for BDS-3 observations is comparable with GPS data. The data fitting for BDS-3 and GPS time series shows that the average value of root mean square (RMS) of the BDS-3 residual time series are 4.42, 4.25 and 8.34 mm for the E, N and U components, respectively, larger than those of GPS data. Systematic difference is identified of about 2 mm/a in E direction between velocity fields of BDS-3 and GPS. The velocity fields, and the annual and semi-annual signals derived from BDS-3 and GPS data do not show obvious differences in regional distribution. We think that currently the factors affecting the positioning precision of BDS-3 are the relatively lower precision of satellite orbit and clock difference products, the shortage of empirical solar pressure and satellite antenna phase center correction for BDS-3 and so on. The difference between the velocity fields of BDS-3 and GPS is due to the inconsistence of their reference frames. We expect that, with the continuous accumulation of BDS-3 observational data and the improvement of the data processing models, the positioning precision of BDS-3 will enhance with time, and the BDS-3 will be used independently from GPS to provide geodetic products of high-precision for monitoring crustal movement at CSES.

Key words: BDS-3, GNSS, China seismic experimental site, crustal deformation

CLC Number:

P227

Tian HE, Guojie MENG, Weiwei WU, Xiaoning SU, Guoqiang ZHAO, Congmin WEI, Zhihua DONG. Preliminary analysis to positioning precision and crustal movement of BDS-3 data recorded by the China seismic experiment site[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(4): 653-665.

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星座	N	E	U
BDS	3.03	1.64	4.47
GPS	0.81	0.80	2.92