LFMCW radar detection moving human body target method based on human body model

A human target and human body model technology, applied in the field of radar information detection, can solve problems such as aliasing, technical difficulty, and insufficient accumulation of target signal energy

Active Publication Date: 2017-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the detection of slow and weak targets on the ground such as people, the technical difficulty is very great. The bottleneck mainly lies in: 1) This type of targets are mostly located in complex strong ground clutter, and have the characteristics of small reflection coefficient and large RCS fluctuation. lead to a weak radar detection capability for such targets
2) There is a serious overlap between the human slow target and the ground clutter spectrum (espe

Method used

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  • LFMCW radar detection moving human body target method based on human body model
  • LFMCW radar detection moving human body target method based on human body model
  • LFMCW radar detection moving human body target method based on human body model

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Embodiment 1

[0102] The LFMCW radar system used in this patent test consists of a transceiver antenna, a transmitter, a receiver, a frequency synthesizer, a signal processor and a target display. The performance parameters of the radar machine are shown in Table 1:

[0103] Table 1 Radar machine performance parameters

[0104]

[0105]

[0106] The above radar is used to collect frequency domain data of people moving slowly at different distances. Among them, the person moves radially towards the radar, and the speed ranges from 0.8m / s to 1.8m / s. By performing direct MTD and phase compensation processing on the collected data, the changes in the target peak energy and noise average power and the improvement of SNR under the two methods are compared. In the phase compensation process, the gait frequency-initial phase is two-dimensional The plane is divided into P×Q points (76 for P and 72 for Q).

[0107] Table 2 and Table 3 are the results of collecting measured data and processin...

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Abstract

The invention provides an LFMCW radar detection moving human body target method based on a human body model. The method comprises the steps that analog-to-digital conversion is carried out on an LFMCW radar echo beat signal; FFT processing is carried out on each PRI echo beat datum to acquire the LFMCW radar echo beat signal frequency domain data when a human body slowly moves, and rearranging is carried out in a slow time-distance domain two-dimensional plane; a Boulic human body walking model is constructed; according to the human body moving gait frequency and an initial phase range, a number of human body trunk moving models with different parameters are constructed on a gait frequency-initial phase two-dimensional plane; an LFMCW radar echo nonlinear phase compensation signal is reconstructed, and phase compensation is carried out on the rearranged data; FFT processing is carried out to acquire a four-dimensional space processing result; whether a target is in a distance unit is judged through constant false-alarm detection processing; and the information of distance, velocity and gait frequency of the target are acquired in the presence of the target. According to the invention, the signal-to-noise ratio of LFMCW radar detection is improved, and the human body target detection performance in strong ground clutter is improved.

Description

technical field [0001] The invention belongs to the technical field of radar information detection, in particular to a method for detecting a moving human target by a human body model-based LFMCW radar. [0002] technical background [0003] In the radar system, target detection is one of the most important tasks. Linear Frequency Modulation Continuous Wave (LFMCW) radar has unique characteristics such as small size, light weight, high distance resolution, no distance blind zone and strong anti-intercept ability. Advantages, in ground reconnaissance scenarios, it can be used to detect moving targets such as enemy personnel, vehicles and tanks, and obtain information such as the distance, speed and orientation of the target. [0004] In the actual environment, due to the large radar cross section (Radar Cross Section, RCS) and fast movement speed of vehicles, tanks and other targets, LFMCW radar can be easily detected. However, for the detection of slow and weak targets on th...

Claims

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Application Information

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IPC IPC(8): G01S13/06G06F19/00
CPCG01S13/06G16Z99/00
Inventor 张仁李张稚梨盛卫星马晓峰韩玉兵
Owner NANJING UNIV OF SCI & TECH
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