Air Force Medical University

The Fourth Military Medical University

Zhao Li

Yang Zhang

Jianqi Wang

Ziqi Zhang

Teng Jiao

Huijun Xue

Hao Lv

Xiao Yu

Fulai Liang

Xijing Jing

Yanfeng Li

Hao Lu

A non-contact method for detecting and distinguishing a human and an animal based on IR-UWB bio-radar signals includes: step 1, transmitting a radar pulse to a target by a transmitting antenna of an IR-UWB bio-radar; and obtaining, by a receiving antenna of the IR-UWB bio-radar, a radar echo signal E(n,m) generated from the radar pulse reflected on the target; step 2: performing signal preprocessing on the radar echo signal E(n,m) obtained in step 1, to obtain a first energy signal E(l); step 3: removing a direct wave from E(l) obtained in step 2 to obtain a second energy signal E(l), and obtaining a maximum amplitude Eof E(l) and a position lcorresponding to the maximum amplitude in a slow time direction; step 4: calculating a peak-to-background ratio Vof E(l), calculating an average correlation coefficient r, and determining a type of the target through a target detection and distinction rule.

Non-contact method for detectiing and distinguishing human and animal based on IR-UWB bio-radar signal

Provided is a multi-target life detection method based on radar signals. The method includes: performing time accumulation in a slow time direction on a preprocessed echo signal to obtain a first echo signal; performing an envelope extraction of inflection points on the first echo signal to obtain a second echo signal; calculating an average value of all amplitude signals in the second echo signal other than M marked amplitude signals; and in response to a ratio of a marked amplitude signal to the average value being greater than a threshold, determining that a living target exists at a radar detection distance corresponding to the marked amplitude signal. According to the life detection method of the present disclosure, a normalization method is adopted to normalize signal amplitudes of the radar in a dimension of fast time (distance). In addition, two envelope extractions of inflection points may be performed.

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

A multichannel UWB-based radar life detector includes a transmitting antenna and three receiving antennas for forming three radar echo signal channels. A 2-dimensional positioning method thereof includes: a1) amplifying weak life signals of stationary human by the channels, providing an 8-point integration method with an interval of 4 points to radar echo signals by distance; then breaking the integrated signals for decomposition and reconstruction in such a manner that target echo signals and three distance signals are formed; providing digital filtering and differential to the target echo signals for amplifying the weak but useful life signals; a2) 1-dimensionally distinguishing the signals by distance, analyzing spatial frequency according to the filtered and differentiated target echo signals as well as the distance signals for obtaining three target projection signals in the three channels; and a3) identifying the 2-dimensional position information of the targets according to the projection signals, forming an image.

Multichannel UWB-based radar life detector and positioning method thereof

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Xi'an, China

Zhao Li