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Feeble respiration signal detection method used for life detection radar

A breathing signal and detection method technology, applied in the field of weak breathing signal detection of life detection radar, can solve the problems of difficult detection and extraction, difficult task of vital sign signal detection, etc., and achieve the effect of meeting the needs of weak vital sign detection.

Active Publication Date: 2014-12-24
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

After removing the interference caused by static clutter such as direct waves, antenna coupled waves, and fixed backgrounds, it is very difficult to detect the vital signs contained in the radar echo signal matrix under the strong noise interference of the post-disaster rescue scene
Especially after disasters such as earthquakes and house collapses, the radar echo response of buried personnel is mainly caused by respiratory movement. It is very difficult to detect and extract these weak vital sign signals under low SNCR

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  • Feeble respiration signal detection method used for life detection radar
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  • Feeble respiration signal detection method used for life detection radar

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[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...

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Abstract

The invention provides a feeble respiration signal detection method used for life detection radar. The feeble respiration signal detection method comprises the following steps: establishing an M*N-dimensional distance slow time signal matrix S(m,n) by a radar echo signal; for each distance unit, performing autocorrelation processing on the slow time direction of the S(m,n) to obtain a signal matrix Rx(m,tau); performing FFT (fast Fourier transform) on each row vector of the Rx(m,tau) to obtain a distance frequency matrix mean-Rx(m,f); performing weighted accumulation on the distance direction of the mean-Rx(m,f) to obtain the frequency spectrum mean-Vw(f) of a respiration signal, and traversing each position of the mean-Vw(f) so as to seeking positions of which the energy ratio is greater than a preset threshold; if the number of the positions if greater than 0, judging that a lift body exists underground. According to the feeble respiration signal detection method provided by the invention, the enhancement, the detection and the extraction of the feeble respiration signal are realized, and the requirement of feeble life feature detection on buried personnel under the disaster assistance occasion and the like is met.

Description

technical field [0001] The invention relates to the technical field of weak signal processing, in particular to a weak breathing signal detection method for life detection radar. Background technique [0002] The ultra-wideband life detection radar system must work in a static state and obtain a two-dimensional original radar echo signal matrix within a certain period of time. After removing the interference caused by static clutter such as direct waves, antenna coupled waves, and fixed backgrounds, it is very difficult to detect the vital signs contained in the radar echo signal matrix under the strong noise interference of the post-disaster rescue scene. Especially after disasters such as earthquakes and house collapses, the radar echo response of buried personnel is mainly caused by respiratory movement. It is very difficult to detect and extract these weak vital sign signals under low SNCR. Contents of the invention [0003] (1) Technical problems to be solved [000...

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Application Information

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IPC IPC(8): A61B5/11
Inventor 吴世有陈洁孟升卫方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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