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A Fast BP Imaging Method for Parallel Bibasic Bunch SAR

A BP imaging and fast technology, applied in the field of SAR imaging, can solve problems such as reducing the amount of calculation, and achieve the effect of reducing the amount of calculation and improving the efficiency of the calculation.

Active Publication Date: 2022-07-29
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

[0005] In view of the problems and deficiencies in the prior art, the purpose of the present invention is to propose a new fast BP imaging algorithm on the basis of the parallel bistatic spotlight SAR mode and the FFBP imaging method to solve the problem of sub-image coherent accumulation. The contradiction between computational efficiency and imaging accuracy caused by two-dimensional interpolation enables the algorithm to greatly reduce the amount of computation and improve computational efficiency while reconstructing high-quality SAR images

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  • A Fast BP Imaging Method for Parallel Bibasic Bunch SAR
  • A Fast BP Imaging Method for Parallel Bibasic Bunch SAR
  • A Fast BP Imaging Method for Parallel Bibasic Bunch SAR

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Embodiment Construction

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] see figure 1 , the fast BP imaging method of the parallel double-base spotlight SAR of the present invention comprises the following steps:

[0035] Step 1: Refer to figure 2 The geometric model of the parallel bistatic spotlight SAR imaging is shown, and the full-aperture echo signal is obtained. Without loss of generality, assume that the oblique viewing angle θ s ≠0. The radar transmitter and receiver follow parallel tracks with velocity v t and v r at distance H t and H r Make a uniform linear motion at the height. Let the instantaneous coordinates of the radar transmitter and receiver be (x t ,y t ,z t ) and (x r ,y r ,z r ), where z t =H t ,z r ...

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Abstract

The invention relates to a fast BP imaging method for parallel bistatic beamforming SAR, which includes: acquiring full aperture echo data of parallel bistatic beamforming SAR; dividing the full aperture data into a plurality of non-overlapping sub-aperture data blocks, using The bibasic BP integral projects the range-compressed sub-aperture data into the global rectangular coordinate system to obtain the initial resolution image of the first-level sub-aperture; uses the spectrum compression function to compress the sub-aperture image spectrum; azimuth the compressed data Upsampling to multiple times; using the conjugate form of the spectral compression function to restore the original signal form of the sub-aperture image; coherently stacking the restored sub-aperture image to obtain a sub-aperture image with improved resolution; Repeat steps S30 to S60 until a full resolution image is obtained. Compared with the imaging algorithm, the present invention can obtain high-quality images, and at the same time, the calculation amount is greatly reduced, and the calculation efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical field of SAR imaging, and in particular relates to a fast BP imaging method for parallel double-base beamforming SAR. Background technique [0002] The dual-base Synthetic Aperture Radar (SAR) system has the advantages of convenient operation, long operating range, many receiving methods, rich information acquisition, good security and anti-interference, and has become an important research direction in the field of radar imaging in recent years. . The parallel dual-base SAR transmitter and receiver are placed on different platforms, respectively, and fly in a straight line at a constant speed along parallel trajectories. Because this mode is relatively simple, it is widely used. The imaging method of dual-base SAR has been tested in succession, and relevant data have been collected and imaging processing has been completed, and a good focusing effect has been obtained. [0003] Imaging algorithm is the core con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9058G01S13/9052G01S13/9017
Inventor 丁晶吴玉峰张红波
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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