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SAR motion target detection and speed estimation method

A moving target and speed estimation technology, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve problems such as large amount of computation

Active Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Existing methods cannot detect targets with only azimuth velocity. The speed estimation method of moving targets based on time-frequency analysis in a strong clutter background will generate a large amount of calculation. In order to overcome the shortcomings of the existing methods and realize the For target detection and speed estimation, it is necessary to improve the SAR moving target detection and speed estimation method

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Embodiment Construction

[0060] The present invention can be verified by means of simulation experiments, and all steps and conclusions are verified to be correct on the MATLABR2017b software. The specific implementation steps are as follows:

[0061] Step 1. Initialize BiDi SAR system parameters:

[0062] Initialize the bidirectional synthetic aperture imaging radar BiDiSAR system parameters, including: radar carrier wavelength λ=0.03m, radar platform antenna transmission signal bandwidth B=1.5×10 8 Hz, radar transmit pulse width T r =1×10 -6 s, radar sampling frequency F s =2.1×10 8 Hz, radar incidence angle φ=79.7°, radar pulse repetition frequency PRF=8000Hz, radar system range sampling points N r =2048, the number of radar system azimuth sampling points N a =16384, radar system azimuth frequency resolution Δf a =8000 / 16384, the initial position of the radar system’s forward main antenna P(0)=[0,0,20000]m, the azimuth oblique angle of the radar antenna transmitting the forward beam, denoted...

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Abstract

The invention discloses an SAR motion target detection and speed estimation method. Based on a bidirectional SAR imaging mode, correspondence between phase and time after imaging via a bidirectional wave beam backward projection algorithm is used, the principle that the interference phase and position offset of a motion target are decided by motion parameters is used, forward and backward SAR images after clutter cancellation are combined with the ATI technology to obtain the radial speed of the motion target, orientation offset, caused by forward and backward wave beam time delay and imagingmismatch, of the motion target in the two SAR images is used to detect the motion target, and finally, the orientation speed of the motion target is roughly estimated according to the orientation pixel offset of the motion target. The radial speed and orientation speed of the motion target are obtained in the data processing process, the disadvantage that the motion target whose frequency spectrumis immersed in the cluster spectrum cannot be detected by a traditional single-channel method is overcome, and the detection probability of the motion target is improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a bidirectional beam-based synthetic aperture radar moving target indication (Synthetic Aperture Radar-Ground Moving Target Indication, SAR-GMTI) method. Background technique [0002] Synthetic Aperture Radar Ground Moving Target Indication (SAR-GMTI) technology is an extension of Synthetic Aperture Radar (SAR) imaging technology, which mainly uses the echo difference between moving targets and stationary targets to realize the detection, positioning and parameter estimation of ground moving targets. It plays an increasingly important role in battlefield terrain surveying, monitoring the navigation of ships on the sea, and observing glacier movement. For details, please refer to the literature "Synthetic Aperture Radar Ground Moving Target Detection Method Research", Zheng Mingjie, Zhang Huansheng, Niu Xiaofeng, etc., Remote Sensing Technology and Application. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/58G01S7/41
CPCG01S13/9029G01S13/9023G01S13/586G01S13/589G01S13/588G01S7/415
Inventor 张晓玲鲍金宇唐欣欣贾淑培师君韦顺军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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