Wall-across human body motion detection method based on short-time Fourier transform

Abstract

The invention discloses a wall-across human body motion detection method based on short-time Fourier transform. The method comprises the following steps: firstly, receiving a signal waveform, which is pre-coded by virtue of a transmitter, by virtue of a receiver; then, segmenting the received signal into various sections of signals, and conducting short-time Fourier transform on each section of the signal so as to obtain a transformation matrix; then, computing a variance vector of the transformation matrix; and finally, by computing the range of the variance vector and comparing the computed range with a threshold, detecting whether human body motion occurs behind a wall or not. The detection method disclosed by the invention can solve the problem on weak target detection in a strong noise environment through the short-time Fourier transform, and the detection method can effectively detect whether the human body motion occurs behind the wall or not, so that the accuracy of detecting the human body motion is greatly improved.

Description

technical field [0001] The invention relates to a method for detecting human motion on a partition wall, in particular to a method for detecting human motion on a partition wall based on short-time Fourier transform. Background technique [0002] Human body detection within the general line of sight can be detected using optoelectronic devices such as infrared cameras and cameras. These techniques are commonly used in intrusion detection in art galleries and banks. However, these technologies have great limitations and cannot be used to detect objects behind non-transparent walls (or shelters) such as stone, wood, concrete, etc., so the detection technology used must have a perspective effect. At present, detection technologies with perspective effects are commonly based on X-rays and ultrasonic echoes, but none of these perspective technologies can well meet the current needs for human body detection through walls. X-rays are high-energy rays. Although they can penetrate ...

AI Technical Summary

Problems solved by technology

[0004] Although the traditional wall-penetrating ultra-wideband radar can detect human movement in the partition wall, it occupies a large amount of bandwidth, has a large transmission power, and has a very large antenna array.

However, it is very challenging to use wireless communication devices with small bandwidth, low transmission power, and small size to detect human motion in partition walls. It is necessary to detect weak targets under strong noise.

At present, the technology of the detection method of human body movement on the partition wall realized by this portable device needs to be further studied and discussed.

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