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A Method of Obtaining Three-Dimensional Movement of Earth's Surface from SAR Data of Two Parallel Tracks

A technology of surface movement and movement, which is applied in the field of seismic synchronous mobile monitoring and mine surface settlement monitoring, which can solve the problems of low practical application value, unrealistic, and large accuracy gap.

Active Publication Date: 2020-08-04
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

Due to the large difference in accuracy between the two, the actual application value is low
[0008] Method 3 combines the results of synthetic aperture radar interferometry and global positioning system observations to solve the three-dimensional component of surface movement. Since the spatial resolution of SAR images is usually between 1.0 and 30.0 meters, and in the entire monitoring range or It is unrealistic to arrange such a high density of GPS stations in the SAR image range

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  • A Method of Obtaining Three-Dimensional Movement of Earth's Surface from SAR Data of Two Parallel Tracks
  • A Method of Obtaining Three-Dimensional Movement of Earth's Surface from SAR Data of Two Parallel Tracks
  • A Method of Obtaining Three-Dimensional Movement of Earth's Surface from SAR Data of Two Parallel Tracks

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[0056] like figure 1 As shown, the present invention is a flow chart of the method for obtaining the three-dimensional movement amount of the ground surface from two adjacent parallel orbit SAR image pairs, and the specific implementation steps are as follows:

[0057] Step 1: Data collection and selection: collect single-view complex SAR data from two adjacent parallel orbits, one scene before and after ground movement, respectively. Selection principle: The time between the two SAR images and the surface movement is as short as possible, and the spatial vertical baseline of the two is as short as possible. In addition, collect digital elevation data (Digital Elevation Model, DEM) with the same coverage area as the SAR image;

[0058] Step 2: Data preprocessing: Cut the SAR images of the two differential image pairs to obtain the image data of the two SAR differential image pairs covering the overlapping area respectively. At the same time, the DEM data is trimmed according...

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Abstract

The invention relates to a method for acquiring surface three-dimensional movement amount from two parallel orbits SAR data. The method comprises the following steps: Respectively collecting data of asingle complex look (SLC) synthetic aperture radar (SAR) from two adjacent parallel orbits before and after the surface movement occurs, and digital elevation model data having the same coverage areaas the SAR image; cutting the SAR images of two differential image pairs to respectively obtain two SAR differential image pair image data covering an overlapping area; carrying out multi-aperture interference measurement processing or offset tracking processing on the two SAR differential image pairs respectively so as to obtain two moving amounts of the surface point in the orbit direction (azimuth direction), and obtaining the moving amount of the surface point with higher precision in the azimuth direction by taking the average value of the two moving amounts of the surface point; respectively calculating the moving amounts of the surface point in the overlapping area in the vertical direction, the east direction and the north direction, the horizontal moving amount of the surface point and the total moving amount of the surface point. The method for acquiring surface three-dimensional movement amount from two parallel orbits SAR data can accurately acquire the three-dimensional movement amount of the surface point in the overlapping area of the parallel orbit SAR image.

Description

technical field [0001] The present invention relates to the fields of obtaining land surface subsidence information in space-to-earth observation, geodetic surveying, engineering surveying and geological disaster monitoring, especially the synchronous mobile monitoring of earthquakes, mobile monitoring of volcanic eruptions, monitoring of surface subsidence in mining areas caused by underground mining, iceberg (river) Mobile monitoring and other fields. The present invention provides a method for accurately obtaining the three-dimensional movement amount of the surface point in the above-mentioned technical field. Background technique [0002] In the use of synthetic aperture radar (synthetic aperture radar, SAR) interferometry to obtain surface (ground) movement information, whether conventional differential radar interferometry (D-InSAR, Differential synthetic radar interferometry) and multi-temporal synthetic aperture radar interferometry ( Multi-temporalsynthetic apertu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 常占强李小娟祝杰钱淑君王延巧
Owner CAPITAL NORMAL UNIVERSITY
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