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A DEM-aided SAR image registration method with high accuracy

A high-precision, image-based technology, applied in the field of microwave remote sensing

Active Publication Date: 2018-12-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a DEM-assisted SAR image high-precision registration method, which effectively solves the partial registration of the existing SAR image two-dimensional function registration method in the case of long baselines and complex terrain areas. Low precision phenomenon

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  • A DEM-aided SAR image registration method with high accuracy
  • A DEM-aided SAR image registration method with high accuracy
  • A DEM-aided SAR image registration method with high accuracy

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Embodiment Construction

[0011] figure 1 It is a schematic flow chart of the principle of the present invention. Combine below figure 1 Describe in detail.

[0012] Step 1: Calculate the elevation corresponding to each pixel of the main image through the orbital parameters of the main image and the corresponding DEM. The geographic coordinates (B, L, H) (longitude, latitude, elevation) of each point on the DEM geographic grid are substituted into the range-Doppler model under the conditions of the main image orbit parameters and imaging parameters for processing. For specific methods, refer to the paper " Utilization of Spaceborne SAR Data for Mapping" (IEEE Transactions on geoscience and remotesensing, Vol.22, No.2, March 1984, pages 107 to 108), it is possible to obtain the corresponding grid points of the DEM geographic grid in the main image , so as to obtain the corresponding elevation h(i, j) of each pixel (i, j) of the main image (i is the azimuth coordinate, and j is the distance coordinate...

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Abstract

The invention provides a DEM-aided SAR image registration method with high accuracy. The technical scheme is as follows: for two SAR images obtained from the same scene, the elevation corresponding toeach pixel of the main image is calculated; then an appropriate number of pixels are selected as control points in the main image, the pixel positions of the control points in the auxiliary image areobtained by correlation coefficient method, and the azimuth registration offset and the distance registration offset between the main image and the auxiliary image at the control points can be obtained. Then a polynomial related to pixel coordinates and pixel elevation is fitted by least square fitting. Finally, the parameters of each pixel of the main image are substituted into the polynomial toobtain the azimuth and range offset between the pixel of the main image and the corresponding pixel of the auxiliary image, and the SAR image registration is completed. The invention solves the problem of low local registration accuracy of the existing SAR image two-dimensional function registration method under the condition that the long baseline is in the long baseline and the complex terrainarea.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, in particular to a DEM (Digital Elevation Model)-assisted SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) image high-precision registration method. Background technique [0002] InSAR (Interferometry Synthetic Aperture Radar, Synthetic Aperture Radar Interferometry) is an earth observation technology, which obtains three-dimensional information of the earth's surface by interfering with multiple SAR complex images acquired by radar satellites under different observation geometries. SAR image registration is the first step in the InSAR processing flow. The accuracy of SAR image registration is crucial to the subsequent processing steps and the final InSAR product. Usually, the accuracy of SAR image registration is required to reach the sub-pixel level. [0003] In SAR image registration, two SAR images are generally used, and one of the images can be selected arbitrarily ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/33G06T17/05
CPCG06T17/05G06T2207/30181G06T7/33
Inventor 甘本对余安喜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