Acta Geodaetica et Cartographica Sinica ›› 2022, Vol. 51 ›› Issue (10): 2117-2124.doi: 10.11947/j.AGCS.2022.20220295

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Switching method of GNSS landslide monitoring reference station considering the correction of motion state

WANG Duo, HUANG Guanwen, DU Yuan, BAI Zhengwei, CHEN Zi, LI Yang   

  1. College of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
  • Received:2022-05-05 Revised:2022-06-29 Published:2022-11-05
  • Supported by:
    The National Key Research and Development Program of China (No. 2018YFC1505105); The National Natural Science Foundation of China (Nos. 42090053;41941019)

Abstract: GNSS relative positioning technology is widely used in high-precision real-time landslide monitoring, and this high-precision positioning relies on continuous and stable reference station data. However, the data of the reference station is often interrupted due to reasons such as power supply and communication, which seriously affects the continuity and reliability of the landslide monitoring results. This paper proposed a switching method of GNSS landslide monitoring reference station considering the correction of the motion state. First, the motion status is determined according to the long-term monitoring time sequence of the new reference station. Then, a displacement model is established based on the landslide deformation evolution law and motion state, and the model is checked regularly. Finally, the displacement of each monitoring point is corrected based on the actual displacement of the new reference. This method was successfully applied to the switching of the reference station of Heifangtai landslide monitoring in Gansu. After correction, the displacement of each monitoring station was close to the real deformation. The improved tangent angle was calculated as the landslide warning criterion, and the monitoring displacement sequences before and after the correction were used for warning. If no corrections are made, it may lead to a misjudgment of the early warning. Aiming at the problem of data interruption in the reference station, this method obtains a continuous and reliable landslide monitoring sequence by switching a new reference and correcting errors, ensuring the continuity of monitoring and the timeliness of early warning.

Key words: landslide monitoring, GNSS, reference station, monitoring datum, deformation analysis

CLC Number: