Mountainous terrain deformation extraction method based on PSInSAR

An extraction method and deformation technology, applied in the field of synthetic aperture radar imaging, can solve the problem of inability to accurately extract terrain deformation in mountainous areas

Inactive Publication Date: 2018-12-18
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The invention provides a method for extracting mountain terrain deformation based on PSInSAR technol

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  • Mountainous terrain deformation extraction method based on PSInSAR
  • Mountainous terrain deformation extraction method based on PSInSAR
  • Mountainous terrain deformation extraction method based on PSInSAR

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[0046] The present invention will be further described below in conjunction with drawings and embodiments.

[0047] see figure 1 , a flow chart of a method for extracting mountain terrain deformation based on PSInSAR technology provided by an embodiment of the present invention, the method includes:

[0048] S100: Select a SAR image, where the SAR image includes a main image and an auxiliary image.

[0049] Selecting SAR images specifically includes:

[0050] Selecting n pieces of SAR images, using the comprehensive coherence method to select one of the SAR images as the main image, and the remaining n-1 pieces as the auxiliary images.

[0051] S200: Using the main image and the auxiliary image to register and perform interference processing to obtain a coherence coefficient map and an interferometric phase map.

[0052] S300: Selecting PS points on the coherence coefficient map by using a double threshold method of amplitude dispersion and coherence coefficient to obtain a...

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Abstract

The invention discloses a mountainous terrain deformation extraction method based on PSInSAR. The method comprises the following steps: acquiring multiple high-resolution SAR images through a space-borne satellite, and selecting n SAR images, selecting one as main image by adopting comprehensive coherent coefficient and other as auxiliary images; enabling the main image to register each auxiliaryimage and performing interference processing, and acquiring a coherent coefficient map and an interference phase map; selecting a PS point by adopting the corresponding amplitude deviation and coherent coefficient double threshold method according to the coherent coefficient map, and obtaining a PS point triangulation network; performing de-planarization filter on the interference phase map, and performing differential processing on the interference map by using external DEM data, thereby obtaining a differential interference map; and performing phase unwrapping on the differential interference map by using three three-dimensional irregular network phase unwrapping methods: a network adjustment method, a pseudo-3D phase unwrapping method and a Lambda algorithm, thereby obtaining a final deformation field.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar imaging, in particular to a method for extracting mountain terrain deformation based on PSInSAR technology. Background technique [0002] Synthetic Aperture Radar (SAR) has the advantages of all-weather and all-weather, and it is widely used in the field of earth observation at home and abroad, among which the application of Interferometric Synthetic Aperture Radar (InSAR) proposed in the 1980s is particularly important. [0003] PSInSAR (Permanent Scatterer Synthetic Aperture Radar Interferometry) to detect surface deformation is developed on the basis of DInSAR (Differential Interferometry), and the differential interferometric phase of PSInSAR is acquired by DInSAR method. DInSAR detection of surface deformation is developed on the basis of InSAR altimetry. By obtaining the complex image pair of the same area on the ground, according to the geometric relationship between the ta...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9023
Inventor 聂鼎黄然周仿荣赵现平沈志方明马仪
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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