Bi-static synthetic aperture radar time-domain fast imaging method

A technology of synthetic aperture radar and imaging method, applied in the field of radar, can solve the problems of poor focusing accuracy, inability to achieve accurate focusing of bistatic SAR, and large computational load.

Active Publication Date: 2014-04-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to address the defects of the background technology, research and design a bistatic SAR time-domain fast imaging processing method, and solve the problem that the bistatic SAR frequency-domain imaging method is limited by the unknown accurate spectrum and the existing bistatic SAR time-domain imaging method Due to the large amount of calculation or poor focusing accuracy, it is impossible to achieve precise focusing of bistatic SAR

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[0083] The present invention mainly adopts the method of simulation experiment to verify, and all steps, conclusions are verified correctly on Matlab2010, and the bistatic synthetic aperture radar system structural diagram that implementation mode adopts is as follows figure 2 As shown, the method of the present invention will be further described in detail below with regard to specific embodiments, and the schematic flow chart is as follows figure 1 shown.

[0084] Step 1: For any target in the imaging area, calculate the distance history of the receiving station and the distance of the transmitting station, generate BSAR point target simulation echo data, denoted as S(t,τ;x,y), and set this matrix as a square matrix , the parameters required for simulation such as image 3 As shown, the target scenario is as Figure 5 shown. The black dots in the picture are 3×3 9 point targets arranged on the ground. These 9 points are spaced 400 meters apart along the x-direction (cut...

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Abstract

The invention discloses bi-static synthetic aperture radar time-domain fast imaging method. The bi-static synthetic aperture radar time-domain fast imaging method comprises the specific steps of adopting low-order approximation of a green function in a back-projection integral function to finish subaperture full view imaging, performing aperture synthesis and view division through iteration, synthesizing subaperture images at an upper-layer stage into synthetic aperture images at each iteration stage, finally finishing full-aperture imaging and accordingly achieving bi-static SAR accurate focusing. The bi-static synthetic aperture radar time-domain fast imaging method is characterized in that a method for block iteration projection from a signal space to an image space is adopted to achieve time-domain imaging, the rough sub-picture focusing is finished by utilizing the low-order approximation characteristic of the green function, and the focusing accuracy is gradually improved through the iteration.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a bistatic SAR imaging method in the synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] SAR is an all-day, all-weather modern high-resolution microwave remote sensing imaging radar. played an increasingly important role. [0003] Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain the non-backscatter information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, since the bistatic SAR receiver does not contain high-power devices, it has low power consumption, small size, and light weight, and is easy to carry on various types of aircraft, and its cost is low. In a word, bistatic SAR, as a new means of space observation of the earth, has a broad space for development in both civilian and military fields. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S7/41G01S13/90G01S13/9017G01S13/9058
Inventor 武俊杰李中余宋雷权黄钰林杨建宇包毅
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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