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Bistatic forward-looking synthetic aperture radar ground moving target detecting method and imaging method

A moving target detection and bistatic technology, applied in the field of radar, can solve the problems of ground moving target detection and imaging not involved in SAR

Active Publication Date: 2015-07-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] In the literature: "Moving Target Imaging A1gorithm for SAR Data", S.Wemess, IEEE Trans.on Aerospace and Electronic Systems, vol.26, no.1, pp.57-67, 1990, in the literature: "Ground Moving Targets Imaging A1gorithm for Synthetic Aperture Radar", S.Zhu, G.Liao, Y.Qu, Z.Zhou, and X.Liu, IEEE Trans. on Geoscience and Remote Sensing, vol.49, no.1, pp.462-477, 2011 and literature: "Theory of Synthetic Aperture Radar Imaging of a Moving Target," J.K.Tao, IEEE Trans.on Geoscience and Remote Sensing, vo1.39, no.9, pp.1984-1992, 2001. Research on ground moving target detection and imaging of bistatic front-looking and side-looking SAR, not involving research on ground moving target detection and imaging of bistatic forward-looking SAR

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  • Bistatic forward-looking synthetic aperture radar ground moving target detecting method and imaging method

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[0101] The present invention mainly adopts the mode of simulation experiment to verify, and the simulation verification platform is Matlab2012. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0102] The schematic flow chart of BFSAR moving target detection method of the present invention is as figure 1 As shown, the specific process is as follows:

[0103] Step 1: Imaging system parameter initialization

[0104] The BFSAR geometric structure figure that the specific embodiment of the present invention adopts is as figure 2 As shown, the BFSAR system parameter table used is as follows image 3 As shown, the target scene diagram used in the implementation of the present invention is as follows Figure 4 As shown, point P in the figure is the ground moving target, P 1 , P 2 , P 3 , P 4 are stationary targets. The initial position coordinates of the BFSAR receiving station platform ...

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Abstract

The invention discloses a bistatic forward-looking synthetic aperture radar ground moving target detecting method and imaging method. The detecting method includes the steps of firstly, utilizing Bulk-Deramp filtering to eliminate Doppler blurs and reducing space variations of the Doppler rate; secondly, utilizing first-order Keystone conversion to complete range migration correction of a static target and a ground moving target; then, utilizing extended orientation nonlinear frequency modulation and frequency scaling operation to equilibrate the Doppler rate of the static target; meanwhile, enabling the Doppler rate of the ground moving target to be different from the Doppler rate of the static target; finally, building a second-order fuzzy function product, completing detection on the ground moving target and estimating the Doppler rate of the ground moving target. The problem that the moving target and the static target are hard to distinguish when BFSAR is under a background with strong clutter is solved. According to the imaging method, after the detection on the ground moving target is completed, an echo of the moving target is focused by using the estimated Doppler rate of the ground moving target, and then imaging the ground moving target is completed.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a bistatic forward-looking SAR moving target detection and imaging method in synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in the fields of terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of small changes in the earth's crust. However, due to the limitation of its own working system, the existing single-base SAR cannot realize high-resolution imaging of the forward-looking area of ​​the aircraft, so that the SAR ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 杨建宇李中余武俊杰黄钰林杨海光
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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