Railway slope monitoring using GNSS precise point positioning and inter-system bias

doi:10.13474/j.cnki.11-2246.2023.0106

Abstract

Abstract: Currently, BDS-3 has been fully completed and new signals with better performance have been broadcast to provide services. The influence of ISB should be taken into account when applying PPP in automated monitoring under railway sheltered environment. This paper takes the monitoring of mountain slope engineering of a railway tunnel as an example. The BDS-2+BDS-3 combined PPP model with ISB is introduced in detail, and the ISB modeling method of octave polynomial+autoregressive integrated moving average model is proposed. The accuracy of the model is verified, and the stability of the slope monitoring point is analyzed. The research shows that when BDS-2 (B1I, B3I) and BDS-3 (B1C,B2a) PPP is used, ISB can reach hundreds of nanoseconds, which can not be ignored, but it has short-term stability. The model is modeled with 14 d ISB series, when the forecast time is 1 d, the model has high fitting accuracy and good consistency. In addition, considering the BDS-2+BDS-3 ISB in the railway sheltered environment, the positioning accuracy and calculation efficiency can be effectively improved. The long-term static deformation monitoring of railway slope can be realized, and the monitoring accuracy can reach millimeter level.

Key words: BDS, ISB, PPP, slope monitoring, station stability

CLC Number:

P228
P258

HE Yilei, ZHANG Yunlong, ZHANG Guanjun, HU Jinmin, CHEN Xusheng. Railway slope monitoring using GNSS precise point positioning and inter-system bias[J]. Bulletin of Surveying and Mapping, 2023, 0(4): 64-70.

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