A multi-angle SAR elevation measurement method and system based on three-dimensional grid projection
A technology of elevation measurement and three-dimensional grid, which is applied in radio wave measurement system, height/level measurement, measuring device, etc., can solve the problem that high-precision elevation information cannot be obtained, and achieve the effect of improving acquisition efficiency
Active Publication Date: 2022-07-29
BEIJING INST OF SPACECRAFT SYST ENG
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[0005] The technical solution of the present invention is to provide a multi-angle SAR elevation measurement method based on three-dimensional grid projection to solve the problem that high-precision elevation information cannot be obtained by using phase information when the azimuth angle between SAR images is relatively large. Projection relationship to extract the true elevation of the target
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[0047] The invention relates to the technical field of spaceborne synthetic aperture radar detection, in particular to target elevation measurement for SAR multi-azimuth observation. In the case of precise elevation information, the target elevation can be accurately measured by combining multi-angle SAR image sequences.
[0048] The ultimate purpose of the present invention is to extract the true elevation of the target by using the multi-azimuth observation projection relationship. Aiming at the problem that high-precision elevation information cannot be obtained by using phase information when the azimuth angle between SAR images is relatively large, an elevation measurement method based on 3D grid projection is proposed. In this method, a main image is selected in a multi-angle SAR image sequence, and the target elevation is searched in a three-dimensional grid to perform geometric registration of other images with the main image. Using the geometric registration results ...
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The invention discloses a multi-angle SAR elevation measurement method based on three-dimensional grid projection. The method includes selecting a main image in a multi-angle SAR image sequence; The sequence is geometrically registered to determine the registration offset of each auxiliary image; the multi-angle SAR image sequence is obtained according to the registration offset; the joint correlation coefficient is calculated to obtain the relationship between the joint correlation coefficient and the target elevation; The search target elevation when the coefficient takes the maximum value realizes the elevation measurement of the target. The invention can realize the acquisition of the elevation information of the single-track multi-angle SAR target, and can be applied to the detailed investigation, surveying and mapping of military targets and the like.
Description
technical field [0001] The invention relates to a multi-angle SAR elevation measurement method based on three-dimensional grid projection, and belongs to the technical field of spaceborne synthetic aperture radar detection. Background technique [0002] Spaceborne synthetic aperture radar has the characteristics of all-day and all-weather operation, and is an effective means of space-to-earth observation. During a single transit, the spaceborne SAR system uses the beam azimuth to scan the target, the scanning angle range can reach ±45°, and the observation time can reach hundreds of seconds. Obtain the 3D geometric information of the target. The three-dimensional geometric information of the target obtained by the multi-azimuth observation can be further used for super-resolution imaging and high-precision positioning of the target, so as to realize the refined description of the scene, which has important application value. [0003] For the establishment of digital elevat...
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IPC IPC(8): G01C5/00G01S13/90
CPCG01C5/00G01S13/9005
Inventor 王志斌张润宁张庆君刘杰匡辉李真芳周超伟于海锋吕争李堃徐明明
Owner BEIJING INST OF SPACECRAFT SYST ENG