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Multi-target life detection method based on radar signal and detection radar

A life detection and radar signal technology, which is applied in the field of detection radar, can solve the problems of low detection accuracy and easy misjudgment of life targets, so as to improve the probability of target detection, reduce target misjudgment, and improve axial recognition The effect of accuracy

Active Publication Date: 2019-03-26
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-target life detection method and detection radar based on radar signals, so as to solve the problems in the prior art that the detection accuracy of the life target is not high, and misjudgment is prone to occur.

Method used

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  • Multi-target life detection method based on radar signal and detection radar
  • Multi-target life detection method based on radar signal and detection radar
  • Multi-target life detection method based on radar signal and detection radar

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Embodiment 1

[0061] This embodiment discloses a multi-target life detection method based on radar signals, such as figure 1 shown, including the following steps:

[0062] Step 1. Transmit the life detection radar signal and receive the original echo signal of the life detection radar;

[0063] In this embodiment, the life detection radar signal is reflected when it encounters an object to form the original radar echo signal. When the life detection radar signal encounters a static object, the original radar echo signal is a stable fixed value, but when When the life detection radar signal encounters a living body, the original echo signal of the radar will fluctuate, so the living body can be detected through these small fluctuations. The living body includes animals, human bodies and other objects containing life, but in this embodiment In , the life object refers to the human body, so the life body includes the life object.

[0064] The original radar echo signal R received by the biol...

Embodiment 2

[0123] This embodiment discloses a multi-target life detection radar, which is used to implement the multi-target life detection method described in Embodiment 1. The multi-target life detection radar includes an array antenna module, a radar main control module and a control display;

[0124] The array antenna module is connected with the radar main control module, and is used to transmit the life detection radar signal, and receive the original echo signal of the life detection radar after the life detection radar signal is reflected by the living body;

[0125] The radar main control module is connected with the control display, and is used for performing distance accumulation in the fast time direction on the original echo signal and then performing noise elimination to obtain a preprocessed echo signal;

[0126] The radar main control module is also used to perform time accumulation in the slow time direction on the preprocessed echo signal to obtain a first echo signal, a...

example

[0141] 1. Shrink detection mode

[0142] The contracted detection mode refers to the detection mode in which the first radar transmitting antenna 21, the second radar transmitting antenna 22, the third radar transmitting antenna 23 and the fourth radar transmitting antenna 24 are respectively placed around the radar transmitting antenna 1 and close to the radar transmitting antenna, Such as Figure 4 shown. Because the radar transmitting antenna and the radar receiving antenna shrink together to approximate the detection mode of transmitting and receiving, there is no attenuation caused by electromagnetic wave propagation delay between the transmitting and receiving units, so the contracted detection mode has strong penetrating ability and is suitable for penetrating thick media Detection and recognition of human targets under the condition.

[0143] 2. Expand the detection mode

[0144] The unfolded detection mode refers to a mode in which the first radar transmitting ante...

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Abstract

The invention discloses a multi-target life detection method based on a radar signal and a detection radar. Time accumulation is carried out on a pre-processed echo signal in a slow time direction toacquire a first echo signal. The first echo signal is subjected to inflection point envelope extraction to acquire a second echo signal. The average value of all amplitude signals other than M mark amplitude signals in the second echo signal is acquired. If the ratio of the mark amplitude signals to the average value is greater than a threshold value, a life target is at the radar detection distance corresponding to the mark amplitude signals. According to the life detection method provided by the invention, a normalization method is used to normalize the radar signal amplitude in the fast time (distance) dimension; the problem of energy attenuation caused by the increase of the radar signal with distance in the process of transmission is solved; the missed rate of a far-end target is effectively reduced; and the method of two inflection point envelope extraction is used to improve the multi-target axial recognition accuracy.

Description

technical field [0001] The invention relates to the field of life detection methods and devices, in particular to a radar signal-based multi-target life detection method and detection radar. Background technique [0002] Life detection radar is a combination of biomedical engineering technology and radar technology that can penetrate non-metallic media (wood, soil, brick, gravel, etc.) for non-contact and long-distance detection of human vital signs (mainly breathing signals). New type of radar. Life detection radar technology has no constraints on the measured object, no need for connection of contact electrodes, sensors, cables, etc., and can detect and identify the human body at a certain distance and through a certain medium, so it is widely used in disasters (earthquakes) , landslides, mine disasters, etc.), personnel search after the anti-terrorist struggle, wall monitoring and battlefield reconnaissance and other fields. Due to the strong penetrating ability of ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S7/41
CPCG01S7/411G01S13/888G01S13/003G01S7/2926G01S7/292
Inventor 张杨王健琪张自启吕昊薛慧君祁富贵
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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