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Time sequence InSAR (Interferometric Synthetic Aperture Radar) ground surface settlement monitoring method based on point target stratified analysis

A layered analysis and surface subsidence technology, which is applied in measuring devices, surveying and navigation, height/horizontal measurement, etc., can solve problems such as less DS, failure to provide deformation information, adverse effects on measurement accuracy, etc., and achieve simple steps and wide practicality The effect of avoiding the spread of error

Pending Publication Date: 2021-09-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Specifically, the larger the value of temporal coherence κ, the less DS and cannot provide detailed deformation information
The smaller the κ value, the more DS, which has an adverse effect on the measurement accuracy

Method used

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  • Time sequence InSAR (Interferometric Synthetic Aperture Radar) ground surface settlement monitoring method based on point target stratified analysis
  • Time sequence InSAR (Interferometric Synthetic Aperture Radar) ground surface settlement monitoring method based on point target stratified analysis
  • Time sequence InSAR (Interferometric Synthetic Aperture Radar) ground surface settlement monitoring method based on point target stratified analysis

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Embodiment 1

[0062] A time-series InSAR surface subsidence monitoring method based on layered analysis of point targets, comprising the following steps:

[0063] Step 1: Select 16 time-series Sentinel-1A images (N=16) covering the study area, and use the first scene image 20161004 as the common main image for registration. After multi-view and fine registration, 800 × 800 pixels were cropped.

[0064] Step 2: According to the cropped Sentinel-1A image, calculate its average amplitude, as shown in Figure 2(a). The SHP is selected based on the average magnitude, which lays the foundation for the construction of the coherence matrix. Figure 2(b) shows the number of SHPs identified when α=5%, and each pixel value in the figure represents the number of SHPs in a window of 15×15 centered on the pixel. It can be seen from the figure that the number of SHP is related to the land cover type to which it belongs. Buildings have strong scattering, and the number of SHPs is small; farmland is a good...

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Abstract

The invention provides a time sequence InSAR ground surface settlement monitoring method based on point target stratified analysis, which is suitable for ground surface settlement monitoring. The method comprises steps of firstly, according to the average amplitude of a time sequence SAR image, identifying homogeneous pixels, and constructing a coherence matrix; based on a PT algorithm of coherence weighting, optimizing a phase and calculating time coherence; and taking pixels greater than a homogeneous pixel threshold value as DS candidate points, performing layered extraction of DS by using a time coherence threshold value, performing point-by-point analysis by using a Pearson correlation coefficient, and suppressing error propagation of a low-quality point target; finally, selecting a PS point by using an amplitude deviation threshold, and carrying out deformation calculation by combining the DS and the PS. According to the method, under the condition that the measurement precision is guaranteed, the space density of the measurement points is increased, a more detailed deformation result is obtained, and real and reliable information can be provided for protection and treatment of land subsidence.

Description

Technical field: [0001] The invention relates to a time-series InSAR surface subsidence monitoring method, in particular to a time-series InSAR surface subsidence monitoring method based on layered analysis of point targets, which is suitable for the technical field of surface subsidence monitoring. Background technique: [0002] Surface subsidence is a relatively common geological disaster. Many scholars at home and abroad have applied time-series SAR interferometry (Interferometric Synthetic Aperture Radar, InSAR) to surface subsidence monitoring. Since the second-generation permanent scatterer technology SqueeSAR was proposed in 2011, the time-series InSAR technology combining permanent scatterers (PS) and distributed scatterers (Distributed Scatterers, DS) has been vigorously developed. Unlike PS, DS belongs to the image pixels in the medium-coherence region in the interference pair, where many adjacent pixels have similar reflectance. It is worth noting that DS is affe...

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Application Information

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IPC IPC(8): G01S13/90G01C5/00G06F17/16
CPCG01S13/9023G01C5/00G06F17/16
Inventor 何倩王瑞吴志聪杨超云
Owner CHINA UNIV OF MINING & TECH
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