Method and system for extracting micro-Doppler features of complex moving target

A feature extraction, complex motion technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems of poor curve separation effect and large amount of calculation, and achieve improved effect and correct processing. High performance, achieve the effect of de-overlapping

Active Publication Date: 2020-12-25
CENT SOUTH UNIV
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Problems solved by technology

However, this method is very poor for the separation of heavily overlapping curves, and it is necessary to detect all the curves every time, which requires a large amount of calculation.

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  • Method and system for extracting micro-Doppler features of complex moving target
  • Method and system for extracting micro-Doppler features of complex moving target
  • Method and system for extracting micro-Doppler features of complex moving target

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0045] Such as figure 1 , 2 As shown, the steps of the complex moving target micro-Doppler feature extraction method in this embodiment include:

[0046] Step S1. Radar signal processing: Obtain the radar echo signal detected by the moving target and convert it into a two-dimensional time-frequency image;

[0047] Step S2. Skeleton extraction: Skeleton extraction is performed on the time-frequency image to binarize the micro-Doppler curve to obtain micro-Doppler curves of different scattering points of the target;

[0048] Step S3. Curve estimation: Carry out curve estimation on the micro-Doppler curves of different scattering points of the target obtained in step S2, and separate the micro-Doppler curves of each single scattering point one by one, wherein whe...

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Abstract

The invention discloses a method for extracting micro-Doppler features of a complex moving target. The method comprises the steps of S1, acquiring a radar echo signal for detecting the moving target and converting the radar echo signal into a two-dimensional time-frequency image; S2, performing skeleton extraction on the time-frequency image to obtain micro-Doppler curves of different scattering points of the target; S3, performing curve estimation on the micro-Doppler curves of different scattering points of the target, separating out the micro-Doppler curves of each single scattering point one by one, judging an end point according to a curve change trend near an overlapping interval when the curve estimation with the overlapping interval exists, and estimating a value in the overlappinginterval by using an interpolation algorithm; and S4, performing modal decomposition on the micro-Doppler curves of each single scattering point obtained in the step S3, and extracting micro-motion features of each scattering point of the target. The method disclosed by the invention can realize micro-Doppler curve separation and feature extraction of the complex moving target, and has the advantages of simple implementation method, high extraction precision and efficiency, high flexibility and the like.

Description

technical field [0001] The invention relates to the technical field of radar target characteristic detection, in particular to a method and system for extracting micro-Doppler features of complex moving targets. Background technique [0002] Radar micro-Doppler is the Doppler modulation caused by the micro-motion of the target. Target fretting includes target precession and nutation, as well as rotation and swing of target structural components. As an important target feature, micro-motion features have important military and civilian values ​​in the field of target recognition, and can effectively extract features of sea, land, and air amphibious targets. With the rapid development of modern radars (such as SAR synthetic aperture, ISAR inverse synthetic aperture radar, etc.), the radar can detect more and more target information, and the information contained in the radar echo is becoming more and more complicated. Extracting and identifying radar The target information c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/88
Inventor 杨德贵彭正红王浩朱政亮陈溅来王行
Owner CENT SOUTH UNIV
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