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Detection of Abnormal Data in GNSS Coordinate Series Based on an Improved Cumulative Sum

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  • Chao Liu

    (School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China
    School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan 056038, China)

  • Qingjie Xu

    (School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China)

  • Ya Fan

    (Guizhou General Team, China Construction Material Industry Geology Survey Center, Guiyang 550009, China)

  • Hao Wu

    (School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China)

  • Jian Chen

    (School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China)

  • Peng Lin

    (College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China)

Abstract

The global navigation satellite system (GNSS), as a high-time resolution and high-precision measurement technology, has been widely used in the field of deformation monitoring. Owing to the influence of uncontrollable factors, there are inevitably some abnormal data in the GNSS monitoring series. Thus, it is necessary to detect and identify abnormal data in the GNSS monitoring series to improve the accuracy and reliability of the deformation disaster law analysis and warning. Many methods can be used to detect abnormal data, among which the statistical process control theory, represented by the cumulative sum (CUSUM), is widely used. CUSUM usually constructs statistics and determines control limits based on the threshold criteria of the average run length (ARL) and then uses the control limits to identify abnormal data in CUSUM statistics. However, different degrees of the ‘trailing’ phenomenon exist in the interval of abnormal data identified by the algorithm, leading to a higher false alarm rate. Therefore, we propose an improved CUSUM method that uses breaks for additive season and trend (BFAST) instead of ARL-based control limits to identify abnormal data in CUSUM statistics to improve the accuracy of identification. The improved CUSUM method is used to detect abnormal data in the GNSS coordinate series. The results show that compared with CUSUM, the improved CUSUM method shows stronger robustness, more accurate detection of abnormal data, and a significantly lower false alarm rate.

Suggested Citation

  • Chao Liu & Qingjie Xu & Ya Fan & Hao Wu & Jian Chen & Peng Lin, 2023. "Detection of Abnormal Data in GNSS Coordinate Series Based on an Improved Cumulative Sum," Sustainability, MDPI, vol. 15(9), pages 1-16, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7228-:d:1133538
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    References listed on IDEAS

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    1. Songliangzi Yang & Changhui Xu & Jinzhong Mi & Shouzhou Gu, 2022. "Dynamic Deformation Monitoring of Offshore Oil Platforms with Integrated GNSS and Accelerometer," Sustainability, MDPI, vol. 14(17), pages 1-17, August.
    2. David McDonald, 1990. "A cusum procedure based on sequential ranks," Naval Research Logistics (NRL), John Wiley & Sons, vol. 37(5), pages 627-646, October.
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