Method for improving earth surface shape change monitoring precision of InSAR (Interferometric Synthetic Aperture Radar) technology based on high-precision DEM (Digital Elevation Model)

Abstract

The invention discloses a method for improving earth surface shape change monitoring precision of an InSAR (Interferometric Synthetic Aperture Radar) technology based on a high-precision DEM (Digital Elevation Model). The method comprises five steps below: step 1, generating an interferogram by using radar data; step 2, generating a differential interference phase diagram; step 3, establishing error phases and performing feature analysis; step 4, establishing an error phase optimal function calibration model; step 5, recovering earth surface shape change information of a monitoring region based on results of steps 2 and 4. According to the invention, the error phases and elevation values or the error phases, the elevations and coordinate values along a distance / azimuth of different regions of a research region are extracted, the optimal function calibration models of the error phases of corresponding regions are established respectively based on a least square method, and a simulative error phase is finally removed from the differential interference phase diagram to further recover shape change information along a direction of a sight line of a radar in the monitoring region. The method for improving the earth surface shape change monitoring precision of the InSAR technology based on the high-precision DEM has practical value and wide application foreground in the application field of a satellite borne synthetic aperture radar monitoring technology for earth surface shape change.

Description

technical field [0001] The invention relates to a method for improving the precision of surface deformation monitoring by synthetic aperture radar interferometry (InSAR) technology based on high-precision digital elevation model (DEM), which belongs to the technical field of space-borne synthetic aperture radar monitoring surface deformation. Based on the radar data and external high-precision DEM, according to a certain functional relationship between the error phase and the elevation of the study area, the optimal error phase correction model of the study area is established, and the deformation information of the ground target in the study area along the radar line of sight is restored, thereby further Improve the ability of InSAR technology to monitor surface deformation. Background technique [0002] The core of InSAR technology monitoring surface deformation is to restore the geometric and deformation characteristics of ground monitoring targets by obtaining the phase ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing method does not consider the error caused by the track baseline and the inaccurate external DEM data, so that the accuracy of the InSAR technology monitoring surface deformation results is not high, and sometimes it is difficult to restore the surface deformation information in a short period of time. Provides a method based on high-precision DEM to improve the accuracy of InSAR technology monitoring surface deformation. It is a method to improve InSAR monitoring surface deformation by establishing an optimal function correction model between the error phase in the differential interferogram and the elevation of the research area to remove the error phase precision method

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