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A method for early identification and monitoring of mine surface subsidence

A technology for surface subsidence and early identification, applied in measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as failure to provide high spatial sampling density deformation maps, inability to obtain PSI measurement points, time-consuming and labor-intensive, etc.

Active Publication Date: 2021-09-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of our country's economy, the demand for mining underground energy is increasing. The mining of underground coal usually leads to continuous land subsidence, which will pose a huge threat to the infrastructure and safety of coal mining areas. Subsidence is monitored and investigated to provide knowledge for disaster early warning systems. Traditional leveling and GPS data can produce reliable land subsidence measurements. However, these field surveys are time-consuming and laborious, and cannot provide deformation maps with high spatial sampling densities;
[0003] Synthetic Aperture Radar (SAR) Interferometry (InSAR) is a powerful technique that uses the phase information of different SAR images to obtain high-precision elevation angles and surface deformations along the line-of-sight direction. DInSAR technology has been used to monitor surface movement in coal mining areas, however , the traditional DInSAR is usually affected by time, geometry and atmospheric decorrelation. Due to the low density and uneven distribution of PSs or coherent points, the traditional method has certain limitations in drawing mining subsidence maps, and most coal mining areas Located in the suburbs, man-made objects are too sparse to obtain enough PSI measurement points, therefore, the present invention proposes a method for early identification and monitoring of mine surface subsidence to solve the problems existing in the prior art

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  • A method for early identification and monitoring of mine surface subsidence
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  • A method for early identification and monitoring of mine surface subsidence

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Embodiment 1

[0033] according to figure 1 As shown, this embodiment provides a method for early identification and monitoring of mine surface subsidence, including the following steps:

[0034] Step 1. Selection and registration of the main image. According to the minimum criterion of the sum of the three baselines, the comprehensive correlation model method or the minimum criterion of the time baseline, N pieces of SAR images are selected and the main image is selected from them, and the selected main images are jointly registered. The amplitude / coherent image is used as the selected image of the PS point and the identification image of the DS point;

[0035] Step 2. Select the PS point, and use the time series amplitude information to measure the phase noise level, especially in the high signal-to-noise ratio pixel, use the amplitude stability of the pixel instead of the phase noise level to obtain the target point. For the SAR complex image, the real part and The imaginary part has a s...

Embodiment 2

[0059] according to figure 1 As shown, this embodiment provides a method for early identification and monitoring of mine surface subsidence, including the following steps:

[0060] Step 1. Selection and registration of the main image. According to the minimum criterion of the sum of the three baselines, the comprehensive correlation model method or the minimum criterion of the time baseline, N pieces of SAR images are selected and the main image is selected from them, and the selected main images are jointly registered. The amplitude / coherent image is used as the selected image of the PS point and the identification image of the DS point;

[0061] Step 2. Select the PS point, and use the time series amplitude information to measure the phase noise level, especially in the high signal-to-noise ratio pixel, use the amplitude stability of the pixel instead of the phase noise level to obtain the target point. For the SAR complex image, the real part and The imaginary part has a s...

Embodiment 3

[0085] according to figure 1 As shown, this embodiment provides a method for early identification and monitoring of mine surface subsidence, including the following steps:

[0086] Step 1. Selection and registration of the main image. According to the minimum criterion of the sum of the three baselines, the comprehensive correlation model method or the minimum criterion of the time baseline, N pieces of SAR images are selected and the main image is selected from them, and the selected main images are jointly registered. The amplitude / coherent image is used as the selected image of the PS point and the identification image of the DS point;

[0087] Step 2. Select the PS point, and use the time series amplitude information to measure the phase noise level, especially in the high signal-to-noise ratio pixel, use the amplitude stability of the pixel instead of the phase noise level to obtain the target point. For the SAR complex image, the real part and The imaginary part has a s...

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Abstract

The invention discloses a method for early identification and monitoring of mine surface subsidence. Firstly, the amplitude dispersion method is used to select PS, and then the classification information and the mathematical statistics method are combined to carry out DS point identification. Combining PS and DS, Delaunay triangulation is used and distance limitation is added. In principle, the selected measurement points are connected, and the atmospheric phase is removed by one of the atmospheric model method, high-pass filtering in the time domain and low-pass filtering in the space domain to reduce the atmospheric phase APS effect, DEM residual error and orbit error, and finally estimate DEM error and deformation rate; the present invention utilizes the robustness of PS and DS for deformation estimation technology, which can perform early identification of high-density surface subsidence in large-area mines, and can quickly and accurately obtain the surface in a large area of ​​mines Subsidence information, improving the identification rate, accuracy and monitoring density of subsidence areas, is of great significance to the early identification and monitoring of mine surface subsidence areas.

Description

technical field [0001] The invention relates to the technical field of surface deformation identification and monitoring, in particular to a method for early identification and monitoring of mine surface subsidence. Background technique [0002] With the rapid development of our country's economy, the demand for mining underground energy is increasing. The mining of underground coal usually leads to continuous land subsidence, which will pose a huge threat to the infrastructure and safety of coal mining areas. Subsidence is monitored and investigated to provide knowledge for disaster early warning systems. Traditional leveling and GPS data can produce reliable land subsidence measurements. However, these field surveys are time-consuming and laborious, and cannot provide deformation maps with high spatial sampling densities; [0003] Synthetic Aperture Radar (SAR) Interferometry (InSAR) is a powerful technique to obtain high-precision elevation angle and surface deformation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/418G01S13/9023G01S13/9094
Inventor 王慧妮李康伦涂美义王卓羽
Owner WUHAN INSTITUTE OF TECHNOLOGY