Strong reflection clutter elimination method based on double-source IR-UWB (Ultra-Wideband) bioradar

A biological radar and strong reflection technology, which is applied in the direction of radio wave reflection/re-radiation, use of re-radiation, radio wave measurement system, etc., can solve the misjudgment of the identification process, waste of rescue time and resources, increased radar false alarm rate, etc. problem, to achieve the effect of improving the accuracy

Inactive Publication Date: 2016-11-09
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sometimes this kind of strong reflection clutter is very similar to the breathing signal of the human body, and it is difficult to remove it with ordinary bio-radar detection technology, resulting in misjudgment during the identification process, resulting in an increase in the radar false alarm rate, wasting precious rescue time and resources

Method used

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  • Strong reflection clutter elimination method based on double-source IR-UWB (Ultra-Wideband) bioradar
  • Strong reflection clutter elimination method based on double-source IR-UWB (Ultra-Wideband) bioradar
  • Strong reflection clutter elimination method based on double-source IR-UWB (Ultra-Wideband) bioradar

Examples

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Effect test

Embodiment 1

[0070] In a certain wall penetration scene, the effectiveness of the method of the present invention is verified:

[0071] Such as Figure 4 As shown, the thickness of the two parallel brick walls in the room is both 24cm, and the dual-source IR-UWB bio-radar system is placed behind one of the walls to detect the unoccupied room. After the detection was completed, a healthy adult man stood close to another wall and faced the radar, breathing calmly, keeping his body still, and the distance between the radar and the human target was about 3m, and then detected it.

[0072] In order to identify the breathing signal of the human target and its location more intuitively, the variance of the point signal at each distance is calculated for the processed radar echo data along the slow time direction, and the energy spectrum of the radar echo signal is obtained.

[0073] Figure 5 with Image 6 Respectively, the energy spectra of radar echo data obtained by using the common IR-UWB ...

Embodiment 2

[0076] The effectiveness of the method of the present invention is verified in a certain ruin scene:

[0077] Such as Figure 9 As shown, the height of the simulated ruins is about 3m, including two 10cm thick concrete prefabricated slabs, two brick piles with a thickness of about 1m, and a ruin cavity with a height of about 80cm. The IR-UWB radar system is placed on the top of the simulated ruins, facing downwards for detection. After the detection was completed, a healthy adult man lay flat in the hollow of the ruins, his chest wall was facing the radar, he breathed calmly, his body remained still, and the distance between the radar and the human target was close to 3m to detect it.

[0078] Figure 10 with Figure 11 are the energy spectra of radar echo data obtained by the common IR-UWB biological radar processing method when there is no human target and human target, respectively. The energy waveforms of the two pictures are very similar, and there are many strong ene...

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Abstract

The invention discloses a strong reflection clutter elimination method based on a double-source IR-UWB (Ultra-Wideband) bioradar. Antennas of two different central frequencies are utilized to perform detection at the same time. Firstly, radar echo signals of two different frequencies are subjected to intra-channel pretreatment respectively, including distance accumulation in a space domain, and normalization, linear trend elimination and low pass filtering in a time domain, so as to achieve enhancement of weak life signals of human bodies; and then the radar echo signals of two different frequencies are subjected to inter-channel treatment after pretreatment, the self-adaption clutter elimination technique is adopted to eliminate interference of strong reflection clutter in a radar echo, thereby improving the radar detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of radar life detection, and relates to a method for eliminating strong reflection clutter based on a dual-source IR-UWB biological radar. Background technique [0002] Ultra-Wideband (UWB) bio-radar combines radar technology and biomedical engineering technology, through the emitted electromagnetic waves to penetrate non-metallic media (wooden boards, walls, ruins, etc.), to detect the movement of living objects, or Micro-movement of the body surface caused by vital signs such as breathing and heartbeat, and based on this to detect and identify living body targets. Compared with detection technologies based on infrared, optics and ultrasound, UWB biological radar can be widely used in medicine, military affairs, anti-terrorism, etc. It has irreplaceable advantages especially in the emergency rescue after disasters such as earthquakes and landslides. [0003] The current UWB bio-radar technology mostly use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/88
CPCG01S7/023G01S13/887G01S13/888
Inventor 李钊王健琪梁福来安强张杨吕昊张华
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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