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Dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging method

A technology of synthetic aperture radar and imaging method, applied in the field of radar

Active Publication Date: 2014-06-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to design a shift-variable bistatic forward-looking synthetic aperture radar frequency-domain imaging processing method for the defects existing in the existing technology, and solve the shift-variable bistatic imaging method that cannot be handled by the traditional SAR imaging method and the existing bistatic imaging method. The two-dimensional space-varying problem of forward-looking SAR, thus realizing the precise focus of shift-variant bistatic forward-looking SAR

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Embodiment Construction

[0071] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2012.

[0072] The geometric structure figure of the embodiment of the present invention is as figure 1 As shown, the present invention will be further described in detail below in conjunction with specific embodiments.

[0073] Step 1: For any target in the imaging area, calculate the distance history of the receiving station and the distance of the transmitting station, and generate a TV-BFSAR point target simulation echo matrix, which is denoted as S(t,τ). The parameters required for the simulation are as follows: image 3 As shown, the target scenario is as Figure 4 shown. The black dots in the picture are 7 point targets arranged on the ground. These 7 points are spaced 350 meters apart along the x direction (cut track), and the coordinates are (-54.6576,350) meters, (-443.4703,350) meters, (-872.9143,350) meters, (707...

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Abstract

The invention discloses a dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging method. According to the problems of strong distance orientation coupling and two-dimensional spatial-variant properties in dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging, the method comprises the steps of firstly, adopting improved Keystone conversion to remove two-dimensional spatial-variant RCM and complete distance compression, then adopting an extended nonlinear CS algorithm to balance Doppler mass centers of target points of the same distance unit and the slope of frequency modulation, and finally obtaining an imaging result through orientation compression. According to the dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging method, the problem of two-dimensional spatial-variant under the transfer variation bistatic forward-looking mode is effectively solved, and therefore accurate focusing of a variation bistatic forward-looking synthetic aperture radar is achieved; the dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging method better solves the problems of spatial-variant range migration and Doppler parameters, and can be used for dual-flight transfer variation bistatic forward-looking synthetic aperture radar imaging.

Description

technical field [0001] The invention belongs to the field of radar technology, and relates to a shift-variable bistatic forward-looking SAR (TV-BFSAR) imaging method in synthetic aperture radar (SAR) imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) can provide high-resolution images of the observation area all day and all weather. Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain non-backscattering information of targets and has a range of It has the characteristics of long distance, concealment and strong anti-interference. It can be divided into fixed transmitting station mode, shift-invariant mode and double-fly shift mode. Compared with the previous two modes, the bistatic SAR in the dual-fly mode provides greater freedom and mobility for the transmitting station and the receiving station, so it is more suitable for actual flight conditions and complex application requirements. [0003] In ...

Claims

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Application Information

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IPC IPC(8): G01S13/90G06F19/00
CPCG01S13/904G01S13/9043G01S13/9011G01S13/9058
Inventor 武俊杰孙稚超黄钰林杨建宇李中余杨海光
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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