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Satellite-borne SAR field-free geometric calibration method and system based on symmetric geometric configuration constraint

A geometric configuration and geometric calibration technology, applied in radio wave measurement systems, instruments, etc., to achieve the effect of improving geometric quality and ensuring geometric quality

Active Publication Date: 2022-01-21
ANHUI UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the defect in the prior art that spaceborne SAR satellites need to rely on ground control data to realize the self-calibration of system error parameters, and to provide a field-free geometric calibration of spaceborne SAR based on symmetrical geometric configuration constraints. The standard method and its system to solve the above problems

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  • Satellite-borne SAR field-free geometric calibration method and system based on symmetric geometric configuration constraint
  • Satellite-borne SAR field-free geometric calibration method and system based on symmetric geometric configuration constraint
  • Satellite-borne SAR field-free geometric calibration method and system based on symmetric geometric configuration constraint

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[0092] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:

[0093] like figure 1 and figure 2 As shown, a kind of space-borne SAR field-free geometric calibration method based on symmetric geometric configuration constraint of the present invention comprises the following steps:

[0094] The first step is to obtain image pairs with symmetrical geometric configurations. Read the metadata file of the image set, filter the spaceborne SAR stereo image pairs that image the same area with different left and right side viewing directions, and the same lifting rail and incident angle, or obtain the same left and right side viewing direction and incident angle of the same area, but different vertical rails Imaged spaceborne SAR stereo image pair.

[0095] Traverse the SAR images taken in the same a...

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Abstract

The invention relates to a satellite-borne SAR field-free geometric calibration method and system based on symmetric geometric configuration constraint. Compared with the prior art, the defect that a satellite-borne SAR satellite can only realize system error parameter self-calibration under the condition of dependence of ground control data is overcome. The method comprises the following steps: acquiring a symmetric geometric configuration image pair; calculating parameters of the distance Doppler geometric positioning model; establishing a geometric positioning model; performing field-free geometric calibration preparation work; and completing the field-free geometric calibration of the spaceborne SAR. According to the method, high-precision geometric calibration of the satellite-borne SAR is realized without dependence of a geometric calibration field, and the precision equivalent to that of traditional geometric calibration of the satellite-borne SAR is realized.

Description

technical field [0001] The invention relates to the field of geometric processing of space-borne synthetic aperture radar images, in particular to a space-borne SAR field-free geometric calibration method and system based on symmetrical geometric configuration constraints. Background technique [0002] The traditional spaceborne SAR geometric calibration method is based on the range-Doppler geometric positioning model, and uses high-precision ground control data (such as corner reflectors, field measurement GPS control points) to calibrate the systematic errors that affect the geometric positioning model, so as to This improves the geometric quality of SAR images. In foreign countries, the traditional geometric calibration method is well developed. The COSMO-SkyMed satellite in Italy uses 4 calibration fields distributed in Italy and 1 calibration field in Argentina to carry out geometric analysis on its single-view oblique distance complex image products. Calibration and g...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 徐凯张军刘思远魏圆圆
Owner ANHUI UNIVERSITY
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