Life sign radar sensor using wireless network signals
A technology for wireless network signals and vital signs, which can be used in radio wave measurement systems, radio wave reflection/re-radiation, sensors, etc., and can solve problems such as difficulty in extracting Doppler phase shifts
Pending Publication Date: 2022-06-21
SUN YAT SEN UNIV
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Problems solved by technology
However, since the communication modulation in the wireless network signal makes it difficult to extract the Doppler phase shift in the reflected signal, the prior art uses the channel state information (Channel State Information, CSI) or error vector magnitude (Error Vector Magnitude) of the communication network ) to evaluate the degree of Doppler effect in the received environmental wireless network signal to indirectly estimate the vital signs of the target. In any case, these previous technologies cannot directly quantify the Doppler caused by vital signs like ordinary Doppler radars. phase shift
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[0052] see figure 1 , which is an embodiment of the present invention, a circuit diagram of a vital sign radar sensor 100 using a wireless network signal, which includes a first splitter 110, an injection-locked oscillator 120, a second splitter 130, a first splitter A demodulation unit 140 , a receiving antenna 150 , a second demodulation unit 160 and a calculation unit 170 .
[0053] The first splitter 110 receives the wireless network signal S via the first low noise amplifier LNA1 w , and the first splitter 110 connects the wireless network signal S w into two paths, where the wireless network signal S w It can be an uplink signal or a downlink signal generated by a wireless network device, and the first splitter 110 can receive the wireless network signal S via wired or wireless transmission. w . At the same time the wireless network signal S w is also transmitted to the target T, and when the wireless network signal S w When touching the target T, a reflected signa...
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The invention relates to a life sign radar sensor using wireless network signals. The life sign radar sensor detects life signs by using wireless network signals, and comprises a first demodulation unit and a second demodulation unit which respectively demodulate direct and reflection path wireless network signals from two different receiving channels to obtain a first demodulation signal and a second demodulation signal, the combined use of the first demodulated signal and the second demodulated signal can eliminate the influence of communication modulation on the process of extracting life signs, and in addition, the life sign radar sensor does not emit signals, so that interference on a wireless network in the environment is avoided.
Description
technical field [0001] The present invention relates to a vital sign radar sensor, in particular to a vital sign radar sensor using a wireless network signal. Background technique [0002] Generally, the Doppler radar transmits a wireless signal to the target and receives the reflected signal reflected by the target, and then extracts the Doppler phase shift caused by the relative displacement between the target and the Doppler radar in the reflected signal, and can measure the target's relative displacement. Vital signs such as breathing and heartbeat. However, the wireless signal transmitted to the target will interfere with the wireless communication network in the environment. If the passive Doppler radar can only receive the wireless network signal in the environment without transmitting the wireless signal, the vital signs of the target can be detected, and the interference can be avoided. Problems with wireless communication networks. However, since the communicatio...
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IPC IPC(8): G01S13/88H04B15/00
CPCG01S13/88H04B15/00G01S7/352G01S7/415G16H40/67A61B5/0507A61B5/0205A61B5/1135A61B5/021G01S13/583
Inventor 洪子圣赖奕辰林睿彦
Owner SUN YAT SEN UNIV