Weighting-based two-dimensional compressive sensing SAR (Synthetic Aperture Radar) imaging and moving target detection method

A moving target detection, two-dimensional compression technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation and other directions, can solve the problem of not considering noise and the scene is not sparse, can not apply radar imaging and detection and other problems

Active Publication Date: 2013-11-20
XIDIAN UNIV
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Problems solved by technology

The radar system using compressive sensing technology can effectively solve this problem, so the radar imaging method based on compressive sensing has become the direction of development. The current rad

Method used

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  • Weighting-based two-dimensional compressive sensing SAR (Synthetic Aperture Radar) imaging and moving target detection method
  • Weighting-based two-dimensional compressive sensing SAR (Synthetic Aperture Radar) imaging and moving target detection method
  • Weighting-based two-dimensional compressive sensing SAR (Synthetic Aperture Radar) imaging and moving target detection method

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Embodiment 1

[0058] The invention is a weighted two-dimensional compressed sensing SAR imaging and moving target detection method, which is mainly used for airborne multi-channel radar. The currently used airborne multi-channel radar system includes antenna, transmitter, receiver, and radar signal processing Machine and terminal equipment. The usual airborne multi-channel radar system has at least 2 antennas. In this example, the radar system has 2 antennas, and the antenna spacing d is 2 meters, see figure 2 The radar transmitter transmits the chirp signal through the antenna 1, and the two antennas receive the signal at the same time. The present invention mainly solves the problem of improving the reconstruction accuracy and the performance of moving target detection when the scene is not sparse and the signal-to-noise ratio is low. According to the weighted two-dimensional compressed sensing SAR imaging and moving target detection method of the present invention, the radar echo received...

Embodiment 2

[0096] Two-dimensional compressed sensing SAR imaging and moving target detection method based on weight, same as embodiment 1

[0097] (1) Obtain the SAR echo signal vector S

[0098] Use as figure 2 The shown dual-channel SAR imaging system, the dual-channel SAR imaging system based on compressed sensing of the present invention, includes 2 antennas, 1 transmitter, 2 receivers and 1 radar signal processor. The radar platform moves along the azimuth direction at a speed of 100m / s, and the shortest distance between the radar and the center of the scene is 3000m. Antenna 1 and antenna 2 are separated by 2 meters. The transmitter of antenna 1 transmits a chirp signal with a carrier frequency of 1.5 GHz, and antennas 1 and 2 receive at the same time. The transmitter of antenna 1 transmits signals covering the scene, and the receivers of antenna 1 and 2 receive echoes from the scene, fast time t, slow time t m At time, the SAR echo data of channel 1 and channel 2 can be obtained as f...

Embodiment 3

[0133] The imaging and detection effects of the method of the present invention can be further illustrated by the following simulation results:

[0134] The two-dimensional compressed sensing SAR imaging and moving target detection method based on weighting is the same as that of embodiment 1-2

[0135] 1. Simulation conditions

[0136] The azimuth length of the scene is -30-30, and the distance length is 2970-3030. The two-dimensional scene is divided into 60×60 scattering points according to the distance resolution and the azimuth resolution. Set 10 static clutter, respectively (0, 3005), (0, 2995), (0, 3010), (0, 2990), (10, 3000), (-10, 3000), (0, 3020) ), (0, 2980), (20, 3000), (-20, 3000); 1 moving target (0, 3000), range speed vr = 0.1m / s, signal amplitude is 1 / of the clutter amplitude 2. Reference Figure 4 .

[0137] Speed ​​of light: c=3e8m / s; azimuth resolution: res_a=1m; range resolution: res_r=1m; radar working distance: Ra=3000m; carrier speed: va=100m / s; emission ban...

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Abstract

The invention discloses a weighting-based two-dimensional compressive sensing SAR (Synthetic Aperture Radar) imaging and moving target detection method. The implementation process of the method comprises the following steps: acquiring echo data through a dual-channel SAR model; constructing reconfiguration matrixes of the channel 1 and the channel 2; constructing a weighting-based restoration reconfiguration method; down-sampling the echo data and the reconfiguration matrixes according to the dual channels; obtaining scattering coefficients of the two channels by using the weighted restoration reconfiguration method and compensating fixed phase difference caused by channel space for the scattering coefficient of the channel 2; performing cluster suppression on the compensated scattering coefficient by using a DPCA (Data Processing Control Area) method to obtain the detected moving target SAR image. The method mainly solves the problems of large reconfiguration error and reduced moving target detection performance under the condition of non-sparse scene and lower signal-to-noise ratio, the reconfiguration accuracy of the SAR image can be improved under the conditions of non-sparse scene and lower signal-to-noise ratio, and the clutter suppression and the moving target detection performance are improved. The method is used for moving target detection of airborne multi-channel radar.

Description

Technical field [0001] The invention belongs to the field of radar detection technology, and mainly relates to signal processing in radar detection, including compressed sensing SAR imaging and moving target detection technology, specifically a weighted two-dimensional compressed sensing SAR imaging and moving target detection method, used in Under the condition that the scene is not sparse and the signal-to-noise ratio is low, the accuracy and robustness of the scatter coefficient of the compressed sensing reconstruction scene are improved, and the detection performance of the radar on the ground moving target is improved. Background technique [0002] With the continuous improvement of synthetic aperture radar image resolution, SAR-based radar moving target detection technology (SAR-GMTI) has been developed rapidly, especially for multi-channel SAR-GMTI, because redundant channels can be used to effectively suppress ground clutter. It is widely used in radar airspace surveillan...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 朱圣棋李金强廖桂生
Owner XIDIAN UNIV
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