SAR (Synthetic Aperture Radar) image geometrical registration method based on elevation correction
A technology of geometric registration and elevation correction, which is applied in the field of microwave remote sensing, can solve the problems of local mismatch of geometric registration method and mismatch of two-dimensional function method, and achieve the effect of improving registration accuracy
Active Publication Date: 2018-09-21
NAT UNIV OF DEFENSE TECH
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[0006] The technical problem to be solved by the present invention is to provide a SAR image geometric registration method based on elevation correction, which can effectively solve the local mismatch problem of the existing geometric registration method, and the two-dimensional function method can be used in complex terrain areas and long baselines. local mismatch phenomenon
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[0013] figure 1 It is a schematic flow chart of the principle of the present invention. Combine below figure 1 Describe in detail.
[0014] Step 1: Extract the elevation of the main SAR image from the DEM. Substitute the geographic coordinates (B, L, H) (longitude, latitude, elevation) of each point on the DEM geographic grid into the range-Doppler model under the conditions of the main image orbit and imaging parameters. For specific methods, refer to the paper "Utilization of Spaceborne SAR Data for Mapping" (IEEETransactions on geoscience and remote sensing, Vol.22, No.2, March 1984, pages 107 to 108) to obtain the corresponding position of each grid point of the DEM in the main SAR image , so as to obtain the elevation of the main SAR image.
[0015] Step 2: Simulate a SAR magnitude image by using the DEM and the orbital parameters of the main SAR image.
[0016] First, use the DEM corresponding to the main image scene to fit a plane on each DEM data grid point, and c...
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The invention provides an SAR (Synthetic Aperture Radar) image geometrical registration method based on elevation correction. According to the technical scheme, the method comprises the following steps: firstly, calculating an elevation of a main SAR image according to main SAR image track data and a DEM (Digital Elevation Model); simulating an SAR amplitude image with an elevation matched with that of the main SAR image by using the main SAR image track data and the DEM; registering the simulated SAR amplitude image with the main SAR image, and acquiring corresponding relationship functions of the simulated SAR amplitude image and the main SAR image; correcting the elevation of the main SAR image by using the corresponding relationship functions; finally, completing SAR image registrationby using a geometrical registration method on the basis of the corrected elevation of the main SAR image. By adopting the method, the problem that partial registration precision is seriously degradedbecause of elevation errors of main SAR images when the geometrical registration method is used is solved, and the registration precision of SAR images in complex terrain regions and long base line situations can be improved.
Description
technical field [0001] The invention relates to the field of microwave remote sensing technology, in particular to a method for geometric registration of SAR images based on elevation correction. Background technique [0002] InSAR (Interferometry Synthetic Aperture Radar, Synthetic Aperture Radar Interferometry) is a new earth observation technology, which uses two or more SAR complex image data acquired by radar satellites under different observation geometries as the information source, through interference The three-dimensional information of the surface is obtained by processing the inversion. SAR image registration is an important step in the InSAR processing flow. High-precision registration of SAR images is a prerequisite for obtaining high-quality interferometric phases. Usually, the registration accuracy is required to reach the sub-pixel level. [0003] In SAR image registration, two SAR images are generally used, one of which can be selected as the main image, a...
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IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 余安喜甘本对孙造宇董臻张永胜何峰何志华金光虎张启雷李德鑫
Owner NAT UNIV OF DEFENSE TECH