Life detection radar system and method based on random code modulation sine wave signal

Abstract

The invention relates to a life detection radar system and method based on a random code modulation sine wave signal. The life detection radar system comprises a radar host and a hand-held terminal, the radar host comprises a power module, a central processing unit, a transmitting unit, a receiving unit, a transmitting antenna, a receiving antenna and a communication unit, the hand-held terminal transmits a life detection command to the radar host, the system generates the random code modulation sine wave signal after receiving the command, the random code modulation sine wave signal is transmitted by the transmitting antenna after being amplified by a power amplifier to perform life detection on a target area, an echo signal received by the receiving antenna is demodulated by a quadraturedemodulator after being amplified by a low noise amplifier, and a data collection module collects the demodulated signal, outputs the signal to the central processing unit to extract life informationand position information, and transmits an analysis and judgment result to the hand-held terminal for display. The system introduces a random code signal into the traditional Doppler life detection radar, so that the reaction is sensitive, the resolution is high, and the anti-interference ability is high.

Description

technical field [0001] The invention relates to the field of human target life detection equipment, in particular to a life detection radar system and method based on random code modulated sine wave signals, which can simultaneously obtain life information and position information of a human target. Background technique [0002] In my country, natural disasters such as earthquakes and mudslides occur frequently. How to quickly find survivors after disasters has become the key to improving search and rescue efficiency. The life detector is an instrument that determines whether there are signs of life in a specific area by detecting life information such as heartbeat, blood pressure, body temperature, and respiration of the human body. The life detectors currently on the market mainly include audio life detectors, video life detectors, infrared life detectors, gas sensitive life detectors and radar life detectors. Audio, video, infrared, and gas-sensitive life detectors are e...

AI Technical Summary

Problems solved by technology

[0003] In the late 1990s, the CW (single-frequency continuous wave) radar developed by the Georgia Institute of Technology in the United States used the phase change of the single-frequency continuous wave echo signal to detect the life information of human targets. The single-frequency continuous wave radar is sensitive. The structure is simple, but it can only detect the life information of the human target and cannot obtain the position of the target; IJImmoreev and others in Russia have developed a UWB (ultra-wideband pulse) radar for emergency rescue. It has the advantages of strong penetrating ability, high distance resolution and strong clutter suppression ability, but the signal processing process is relatively complicated and there is a gap between the maximum detection distance and resolution. irreconcilable contradictions

In 2005, the Turkish ILHT (International Laboratory for High Technology) laboratory developed a step frequency continuous wave life detection radar system. The step frequency continuous wave life detection radar uses the frequency difference between the step frequency continuous wave echo signal and the transmitted signal Detection of life information and position information of human targets with phase changes overcomes the shortcomings of Doppler radar that cannot be positioned poor

In 2012, Narayanan Ram.M. of the University of Pennsylvania in the United States proposed a new type of life detection radar system based on ultra-wideband noise and sinusoidal continuous wave. Broadband noise is used to locate the target behind the wall, and the sine continuous wave is used to detect the life information of the target. This system solves the shortcoming that the single frequency continuous wave cannot measure the target position, but the hardware structure is relatively complicated, and the signal amplitude of the noise signal is small , it is difficult to carry out long-distance life detection

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