Bulletin of Surveying and Mapping ›› 2021, Vol. 0 ›› Issue (5): 124-128,154.doi: 10.13474/j.cnki.11-2246.2021.0156

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Recognition and early warning of deformation information in GNSS coordinate series based on the LWR-Pettitt method

DUAN Wei1, WANG Min1, WU Hao2, LIU Chao2   

  1. 1. Nanjing Institute of Surveying, Mapping & Geotechnical Investigation, Co., Ltd., Nanjing 210019, China;
    2. School of Geomatics, Anhui University of Science & Technology, Huainan 232001, China
  • Received:2020-06-23 Published:2021-05-28

Abstract: GNSS deformation monitoring data usually has no specific distribution characteristics, which is not conducive to the establishment of universal statistics. As a non-parametric test method, the Pettitt test is introduced to establish statistics of GNSS deformation monitoring data, and then the deformation information identification and early warning are carried out. However, the statistics constructed by the Pettitt test always have large fluctuation, and can only be used to identify the single deformation information. Therefore, a new method named LWR (Locally Weighted Regression)-Pettitt is proposed to optimize the statistics and threshold judgment method in the Pettitt test, and is used for GNSS deformation information identification and early warning in this paper. The experimental results show that the proposed method can identify the location of deformation information effectively, especially for trend-type deformation information, but for the abrupt-type deformation information, it can only identify the continuous deformation information more than two-fold standard deviation equivalent deformation.

Key words: GNSS, Locally Weighted Regression, Pettitt, deformation monitoring, deformation early warning

CLC Number: