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Multichannel multi-human body target two-dimensional positioning method based on UWB (Ultra Wide Band) radar type life detector

A life detector and two-dimensional positioning technology, which is applied in the field of two-dimensional positioning of multiple human targets, and can solve problems such as identification and two-dimensional positioning of multiple stationary human targets that have not yet been solved.

Inactive Publication Date: 2011-05-25
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recognition and 2D localization of multiple stationary human targets has not been addressed in this field so far

Method used

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  • Multichannel multi-human body target two-dimensional positioning method based on UWB (Ultra Wide Band) radar type life detector
  • Multichannel multi-human body target two-dimensional positioning method based on UWB (Ultra Wide Band) radar type life detector
  • Multichannel multi-human body target two-dimensional positioning method based on UWB (Ultra Wide Band) radar type life detector

Examples

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Effect test

Embodiment 1

[0041] In this embodiment, a certain channel in the multi-channel is taken as an example for illustration. figure 1 It is a schematic block diagram of a single-channel ultra-wide-spectrum radar life detector system. First, the pulse oscillator generates a pulse signal, which triggers the electromagnetic pulse generator to generate a narrow pulse, which is radiated through the transmitting antenna. The reflected signal is sent to the sampling integrator through the receiving antenna, and the signal generated by the pulse oscillator passes through the delay circuit to generate a range gate to select the received signal. The signal passes through the sampling integration circuit, and after thousands of pulses are accumulated, the weak signal It is detected, amplified and filtered, and then sent to the computing unit after being sampled by a high-speed acquisition card. The computing unit analyzes, processes and recognizes the collected signal, and finally calculates the target di...

Embodiment 2

[0050] In this embodiment, one channel in the multi-channel is taken as an example to illustrate the weak signal enhancement method of a static target.

[0051] To realize the recognition of stationary human targets, the weak life signals of stationary human bodies should be enhanced first. In this embodiment, according to the characteristics of the UWB radar echo signal, the weak biomedical signal processing method is used to process the signal after high-speed sampling and enhance the useful signal to improve the signal-to-noise ratio and realize the basic recognition of human targets .

[0052] Use 8-point 4-point integration method to integrate the signal in the distance; then break up the signal for decomposition and reconstruction, and synthesize the target echo signal and distance signal; digitally filter and digitally differentiate the target echo signal to achieve Enhancement of weak useful signals.

[0053] 2.1 Integration of signals

[0054] The sampling rate of ...

Embodiment 3

[0089] In this embodiment, a certain channel in the multi-channel is taken as an example to illustrate the one-dimensional distance distinction method and the spatial frequency analysis method:

[0090] After the weak signal enhancement of the static target is completed, it is necessary to distinguish the distance of the human target. Because the range signal is an ultra-low frequency signal that reflects the distance information of the target, the present embodiment constructs a joint distribution function of space and frequency, and adopts the joint analysis method of space frequency (reformed Time-frequency analysis) analyzes the distance signal, describes the energy density and intensity of the signal at different distances and frequencies, and then gives the distance information of each human target.

[0091]Time-frequency analysis shows the change of the signal spectrum on the time axis. When the time variable is changed into a distance variable, the time-frequency analy...

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Abstract

The invention discloses a multichannel multi-human body target two-dimensional positioning method based on a UWB (Ultra Wide Band) radar type life detector. The life detector comprises a transmitting antenna and three receiving antennas which respectively form three radar echo signal channels. The two-dimensional positioning method comprises the following steps of: A1. enhancing a weak life signal of a static human body by all channels and integrating a radar echo signal in distance by all the channels through adopting a method for integrating eight points at an interval of four points; scattering the integrated signal for decomposing, reconstructing and synthesizing a target echo signal and a distance signal; carrying out digital filtration and digital differentiation on the target echo signal and realizing the enhancement of the weak available signal; A2. distinguishing one-dimensional distance, carrying out space frequency analysis according to the target echo signal obtained afterdigital filtration and digital differentiation and the distance signal by all the channels and respectively obtaining three projecting signals of a target in the three channels; and A3. confirming the two-dimensional position information of the target according to the three projecting signals and forming a display image.

Description

technical field [0001] The invention relates to the technical field of non-contact life parameter detection, in particular to a two-dimensional positioning method for multiple human targets of a multi-channel UWB-based radar life detector. Background technique [0002] Radar life detector is a kind of integrated radar technology and biomedical engineering technology that can penetrate non-metallic media (brick walls, ruins, etc.) An emerging special radar. The radar life detector technology is an emerging technology that takes life as the detection target, and is recognized by the international scientific and technological circles as a very important frontier technology field. Since this technology has no constraints on the measured object, it does not require the connection of contact electrodes, sensors, cables, etc., and it can measure the human body at a certain distance and through certain media (such as clothes, gauze, brick walls, ruins, etc.). Identification and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/04G01S13/88A61B5/113
Inventor 张杨王健琪荆西京吕昊李钊李岩峰于霄
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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