Co-seismic deformation extraction and accuracy analysis of the Maduo Earthquake based on the combined of different global navigation satellite systems

doi:10.13474/j.cnki.11-2246.2023.0205

Abstract

Abstract: At present, high frequency global navigation satellite system (GNSS) signal has been widely used in co-seismic deformation monitoring of major earthquakes. In this paper, the accuracy of seismic deformation monitoring by different satellite navigation system combinations is comprehensively analyzed. Based on the high frequency (sampling rate of 1 Hz) GNSS observation data of eight regional CORS stations in the near and far fields around the Qinghai Maduo Earthquake (Mw 7.4), the co-seismic deformation achieved and accuracy improvement ratio from single system to multi-system combination are preliminarily analyzed by precision point positioning technology processing strategy. Then, the co-seismic deformation error and accuracy improvement ratio of multi-system combination with the same number of systems and different satellite navigation system combinations are compared and analyzed. Finally, based on the combination of GREC2 (GPS/GLONASS/Galileo/BD-2) and GREC3 (GPS/GLONASS/Galileo/BD-3), the accuracy difference between BD-2 and BD-3 is analyzed. The results show that the accuracy of co-seismic deformation observation by multi-system combination is better than that by single system, among which GEC2+3 (GPS/Galileo/BD-2/BD-3) combination has the best accuracy. Compared with single system GPS, the accuracy of co-seismic deformation observation by GEC2+3 combination can be improved by 30%～60% in horizontal direction, while the vertical accuracy can be improved by 30% on average. The satellite navigation system combination with Beidou has the best performance. Among the satellite navigation system combination with 3 systems, the error of the combination with Beidou in horizontal direction and vertical direction can reach 5～6 mm and 6～9 mm, respectively.

Key words: high frequency GNSS observation, combination of different satellite navigation systems, Maduo earthquake, co-seismic deformation, accuracy analysis

CLC Number:

P228

TAN Mingming, FAN Yaling, Lü Kexin, HAO Shang, XU Tao, CAI Guotian, ZHANG Jie, LI Zhicai. Co-seismic deformation extraction and accuracy analysis of the Maduo Earthquake based on the combined of different global navigation satellite systems[J]. Bulletin of Surveying and Mapping, 2023, 0(7): 80-84.

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