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Self-adaptive static human body target positioning method based on EMD for through-wall radar

A technology of through-wall radar and human target, applied in the field of stationary target detection and positioning, it can solve the problems of not involving target positioning, unable to automatically select signal components, etc., and achieve the effect of improving image quality

Active Publication Date: 2018-11-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to know the prior location of the target, and cannot automatically select the decomposed signal components. In addition, this method does not involve target positioning
Judging from the published literature, there is no EMD-based adaptive positioning method for through-wall targets

Method used

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  • Self-adaptive static human body target positioning method based on EMD for through-wall radar
  • Self-adaptive static human body target positioning method based on EMD for through-wall radar
  • Self-adaptive static human body target positioning method based on EMD for through-wall radar

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Experimental program
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Effect test

Embodiment Construction

[0063] Step 1: Decompose echo distance image steps

[0064] Step 1-1: The MIMO radar continuously transmits step frequency signals and receives target echo signals at the same time. Suppose the MIMO radar is composed of M transmitting antennas and N receiving antennas. The mth transmitting antenna, m=1,2,...,M, the transmitted step frequency signal can be expressed as:

[0065]

[0066] Among them, f 0 is the initial frequency, Δf is the frequency step, Ω is the number of frequency points, T 0 is the duration of each frequency point. Therefore, the nth receiving antenna, .., receives the target echo as:

[0067]

[0068] Among them, |Γ|e jφ Represents the complex reflection coefficient of the target, τ(t)=2r(t) / c represents the target propagation delay, and c represents the electromagnetic wave propagation velocity. r(t) represents the real-time distance between the target and the radar array. For a stationary human body, the average distance from the chest surface...

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Abstract

The invention discloses a self-adaptive static human body target positioning method based on EMD for a through-wall radar, relates to a through-wall radar technology, in particular to a static targetdetecting and positioning technology for the through-wall radar, and provides a static target positioning algorithm suitable for the MIMO through-wall radar. The method comprises the steps that received multi-cycle data is subjected to fast time dimension Fourier transform so as to obtain multi-cycle range profiles; then the multi-cycle range profiles are divided into a plurality of column vectorsaccording to range cells, and each column vector data is processed by using an EMD algorithm; the processed range profiles are converted into a frequency domain through slow time dimension Fourier transform, and the range profiles containing the target information are selected in a self-adaptive mode; and finally, fast imaging is carried out through a BP imaging algorithm, and noise and clutter are further inhibited by combining with a PCF algorithm. The method has the advantages that the positioning precision is high, the capability of adaptively processing data can be achieved, and the method can be directly applied to through-wall radar equipment.

Description

technical field [0001] The invention relates to the technology of through-wall radar, in particular to the technology of detecting and locating stationary targets of through-wall radar. Background technique [0002] Through-the-wall radar is a special equipment that uses electromagnetic waves of specific frequency bands to penetrate buildings and receive scattered echo data from targets such as human bodies behind buildings to achieve imaging detection and tracking of hidden targets. In recent years, it has been used in anti-terrorism, street fighting, disaster rescue and other military and civil applications are becoming more and more widely used. Due to the existence of the building wall, the direct echo of the wall in the radar echo is very strong, resulting in a low signal-to-noise ratio of the target. The performance of the moving target filter (MTI) commonly used in through-wall radar will be limited when dealing with stationary targets, because the fretting range of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/89G01S7/41
CPCG01S7/414G01S7/418G01S13/888G01S13/89
Inventor 崔国龙曹凌霄陈国浩郭世盛李虎泉孔令讲杨晓波易伟张天贤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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