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An airborne SAR high-resolution tomography method

A tomographic imaging and high-resolution technology, which is applied in the direction of instruments, measuring devices, and re-radiation, can solve the problems of SAR image observation angle difference and tomographic imaging resolution decline, etc., and achieve tomographic imaging and high-resolution Tomography, avoiding inaccurate effects of deskewing

Active Publication Date: 2021-07-16
XIDIAN UNIV
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Problems solved by technology

[0004] However, the above method can only obtain high-resolution tomographic imaging results when the baselines of different passes are not significantly different, and the coherent speckle noise in the SAR image is not obvious. , and when there is coherent speckle noise in the SAR image, the resolution of the tomography is reduced

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  • An airborne SAR high-resolution tomography method
  • An airborne SAR high-resolution tomography method

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Embodiment 1

[0076] At present, the existing SAR tomography method is under the scenario of multiple voyages of the baseline, large differences in observation angles, and large influence of coherent speckle noise, because there is a serious deterioration of the elevation to the side lobe, and all homologous points in the SAR image cannot Inaccurate deflection of deflection when accurate registration and elevation focus are performed simultaneously at the same pixel (pixel of the same name), resulting in a decrease in tomographic resolution.

[0077] Based on the above problems, please refer to figure 1 , figure 1 It is a schematic flowchart of an airborne SAR high-resolution tomography method provided by an embodiment of the present invention. This embodiment provides an airborne SAR high-resolution tomography method, the method comprising:

[0078] Step 1. Obtain N pieces of two-dimensional SAR images, where N is an integer greater than 1;

[0079] Step 2, performing registration proce...

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Abstract

The invention discloses an airborne SAR high-resolution tomography method. The method comprises: acquiring a two-dimensional SAR image; registering the two-dimensional SAR image to obtain a registered two-dimensional SAR image; The two-dimensional SAR image after phase correction is corrected for the phase error of the three-dimensional SAR image; the target pixel point and its coordinates in the earth-centered and ground-fixed coordinate system are obtained from the phase-corrected two-dimensional SAR image; according to the target pixel point, coordinate Construct the imaging grid in the elevation direction; find out the pixels with the same name from the phase-corrected two-dimensional SAR image according to the imaging grid in the elevation direction and the target pixel; perform focus imaging according to the target pixel and the pixel with the same name to obtain the three-dimensional SAR image . The present invention performs tomographic imaging on different voyages, which not only overcomes the problem of serious deterioration of the elevation sidelobe when the vertical effective baseline is unevenly distributed, but also avoids the defect of inaccurate deflection during elevation focusing, so as to achieve high-resolution Tomography.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an airborne SAR high-resolution tomographic imaging method. Background technique [0002] Tomosynthetic aperture radar imaging technology is a cutting-edge technology in modern radar remote sensing measurement. The essence of this imaging technology is to make multiple observations of the same scene or ground object from different perspectives in the elevation direction. A single observation forms a two-dimensional synthetic aperture radar image, and multiple observations form a synthetic aperture in the elevation direction, focusing along the elevation direction to achieve elevation upward scatterer resolution, thereby realizing high-resolution three-dimensional imaging of the target. Compared with two-dimensional SAR images, tomosynthetic aperture radar imaging technology can accurately estimate the height position and scattering intensity of differ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9005G01S13/9004
Inventor 李真芳唐繁乙解金卫王志斌
Owner XIDIAN UNIV
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