A Secondary Azimuth Focusing Method of Synthetic Aperture Radar Image
A synthetic aperture radar, secondary focusing technology, applied in radio wave reflection/re-radiation, special data processing applications, using re-radiation, etc.
Inactive Publication Date: 2017-01-04
XIDIAN UNIV
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[0005] Aiming at the problem that the traditional SAR imaging processing algorithm fails to consider the influence of the ground elevation on the equivalent velocity, which causes defocusing in some areas of the high-resolution SAR image, the invention proposes a secondary focusing method for the azimuth of the synthetic aperture radar image
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[0045] The present invention will be further described below in conjunction with accompanying drawing:
[0046] refer to figure 1 , is a flow chart of a secondary focusing method for azimuth of a synthetic aperture radar image of the present invention. The azimuth secondary focusing method of the synthetic aperture radar image comprises the following steps:
[0047] Step 1, obtain the SAR echo data, perform SAR imaging processing on the SAR echo data, obtain the SAR image, and obtain a priori digital elevation model that can cover the imaging area. Specifically, in Step 1, in While obtaining the SAR image, the auxiliary parameters of SAR imaging processing (including pulse repetition frequency PRF, radar carrier frequency fc, azimuth signal bandwidth Ba, signal bandwidth Br, and range sampling rate Fr) must also be obtained.
[0048] Step 2, divide the SAR image into N image blocks of the same size, where N is a natural number greater than 1. In the embodiment of the present...
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The invention belongs to the technical field of synthetic aperture radar image azimuth focusing, in particular to a synthetic aperture radar image azimuth secondary focusing method. The present invention comprises the following steps: step 1, obtain the SAR image after imaging processing; step 2, divide the SAR image into a plurality of image blocks of the same size; when i=1, execute step 3; step 3, set iteration parameters When j=1, execute step 4; step 4, obtain the elevation of the target point corresponding to the given pixel point, the given pixel point is the jth pixel point of the i-th image block of the N image blocks; calculate the given The radar equivalent velocity corresponding to the pixel point; construct the quadratic phase error compensation function corresponding to the given pixel point; perform phase compensation on the given pixel point of the i-th image block of the N image blocks; judge all image blocks Whether the phase compensation process of the pixel is completed, and if it is completed, all the image blocks after phase compensation are merged into a SAR image after secondary focusing in azimuth.
Description
technical field [0001] The invention belongs to the technical field of synthetic aperture radar image azimuth focusing, in particular to a synthetic aperture radar image azimuth secondary focusing method. The present invention first establishes a polynomial model among radar equivalent velocity, target azimuth, distance and elevation position, then uses the polynomial model and target positioning results to quickly calculate radar equivalent velocity, and constructs Doppler domain equivalent velocity space The variable error compensation function is used to perform azimuth secondary focusing on the traditional SAR imaging results. Background technique [0002] Synthetic Aperture Radar (SAR) has been widely used in military and civilian fields due to its all-weather and all-weather high-resolution earth observation capabilities, such as battlefield reconnaissance, ocean monitoring, agricultural census and topographic mapping. [0003] The traditional SAR imaging processing a...
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IPC IPC(8): G01S13/90G06F19/00
Inventor 索志勇李真芳蔡丽美刘艳阳王志斌李锦伟
Owner XIDIAN UNIV