In-vehicle living body detection method and device using phase matching
A living body detection and phase matching technology, applied in the direction of using re-radiation, measuring devices, re-radiation of sound waves, etc., can solve the problems of prone to false alarms, troublesome users, etc., achieve low probability of missed alarms, and reduce the probability of false alarms Effect
Active Publication Date: 2022-05-24
NANJING CHUHANG TECH CO LTD
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This method is very prone to false alarms when there are shaking objects in the detection area or the car body itself is shaking (such as the shaking of the car body caused by the trailer, the shaking of the accessories hanging behind the driver's seat, etc.), such false alarms will be cause great trouble to users
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[0058] The present invention will be further illustrated below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0059] like figure 1 As shown, the embodiment of the present invention provides a method for detecting liveness in a vehicle using phase matching, including:
[0060] Send a radar detection signal to the car and receive the echo signal. The radar detection signal includes a millimeter wave radar detection signal or an ultrasonic radar detection signal. Taking the millimeter-wave radar signal as an example, the intermediate frequency signal after the millimeter-wave radar is mixed is expressed as:
[0061]
[0062]
[0063] in, is the radar carrier frequency, for the first ...
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The invention discloses an in-vehicle living body detection method and equipment using phase matching. The method comprises the following steps: sending a radar detection signal into a vehicle, receiving an echo signal, and sampling phase information of a radar slow time dimension in a selected detection area to obtain phase information of a radar echo slow time dimension; carrying out amplitude normalization processing on the phase information of the slow time dimension to obtain amplitude normalized phase information, carrying out matched filtering by utilizing a preset filter coefficient and the amplitude normalized phase information to obtain a correlation spectrum function, and taking a maximum value of the correlation spectrum function in the slow time to obtain a maximum value of the correlation spectrum function; and comparing the maximum value of the correlation general function in the slow time with a set threshold value, and if the maximum value of the correlation general function in the slow time is greater than the set threshold value, judging that a living body exists in the vehicle. In-vehicle living body detection can be realized through the single millimeter-wave radar, and the false alarm probability is reduced under the condition of low missed alarm probability.
Description
technical field [0001] The invention relates to the technical field of living body detection, in particular to a method and equipment for detecting living body in a vehicle using phase matching. Background technique [0002] With the popularization of automobiles, vehicles are used more and more frequently in people's lives. However, parents leave infants or children in the car, and owners leave pets in the car, which eventually lead to tragic events from time to time, causing great pain to many families. Therefore, it is imminent to realize the function of in-vehicle living body detection and alarm. [0003] The traditional way of thinking is to install a camera in the car, and use image technology or video technology to detect whether there is a living body in the car. The interior of the car is a private space, and the installation of cameras in the car threatens personal privacy. Therefore, a sensor with stronger privacy is needed to replace the camera to detect the li...
Claims
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IPC IPC(8): G01S13/88G01S15/88G01S7/41G01S7/539G06F17/15
CPCG01S13/88G01S15/88G01S7/41G01S7/539G06F17/153
Inventor 王一鸣顾超徐明成谷邦杰
Owner NANJING CHUHANG TECH CO LTD