Radio frequency radar device and method for detecting vital information and humidity

Abstract

A method for detecting vital information and humidity using a radio frequency radar device is provided. In the method, an incident radar signal is transmitted to a field to detect a reflected radar signal reflected by an object to be measured and a reflected radar signal reflected by a humidity sensing tag. Therefore, vital information of the object to be measured and humidity information detected by the humidity sensing tag are obtained.

What is claimed is: 
     
         1 . A method for detecting vital information and humidity, comprising:
 transmitting an incident radar signal to a field and receiving a reflected radar signal corresponding to the field;   processing the reflected radar signal to obtain a body reflection signal of an object to be measured and a tag reflection signal of a humidity sensing tag;   obtaining vital information according to phase information of the body reflection signal; and   obtaining humidity information according to an energy intensity of the tag reflection signal.   
     
     
         2 . The method for detecting vital information and humidity according to  claim 1 , wherein the body reflection signal is obtained by demodulating the reflected radar signal according to a frequency corresponding to the incident radar signal, and the tag reflection signal is obtained by demodulating the reflected radar signal according to twice the frequency corresponding to the incident radar signal. 
     
     
         3 . The method for detecting vital information and humidity according to  claim 1 , wherein the body reflection signal and the tag reflection signal are obtained by demodulating the reflected radar signal according to a frequency corresponding to the incident radar signal. 
     
     
         4 . The method for detecting vital information and humidity according to  claim 3 , wherein the body reflection signal and the tag reflection signal are distinguished according to a phase oscillation frequency of the reflected radar signal. 
     
     
         5 . The method for detecting vital information and humidity according to  claim 1 , wherein the humidity information is determined according to a result of comparing the energy intensity of the tag reflection signal with a threshold. 
     
     
         6 . The method for detecting vital information and humidity according to  claim 1 , wherein the humidity information is determined according to a result of comparing a variation amount of the energy intensity of the tag reflection signal with a threshold. 
     
     
         7 . The method for detecting vital information and humidity according to  claim 1 , further comprising:
 distinguishing a type of the obtained vital information according to an oscillation frequency of the phase information.   
     
     
         8 . The method for detecting vital information and humidity according to  claim 1 , further comprising:
 transmitting another incident radar signal with a different frequency to the field.   
     
     
         9 . The method for detecting vital information and humidity according to  claim 8 , wherein the body reflection signal is obtained by demodulating the reflected radar signal according to a frequency corresponding to one of the two incident radar signals, and the tag reflection signal is obtained by demodulating the reflected radar signal according to a frequency corresponding to the other of the two incident radar signals. 
     
     
         10 . The method for detecting vital information and humidity according to  claim 8 , wherein the two incident radar signals are transmitted in a time-division duplex manner. 
     
     
         11 . A radio frequency radar device, comprising:
 a transmission unit, configured to transmit an incident radar signal to a field;   a receiving unit, configured to receive a reflected radar signal corresponding to the field;   a demodulation unit, coupled to the transmission unit and the receiving unit, and configured to process the reflected radar signal to obtain a body reflection signal of an object to be measured and a tag reflection signal of a humidity sensing tag; and   a processing unit, coupled to the transmission unit, the receiving unit, and the demodulation unit, and configured to obtain vital information according to phase information of the body reflection signal, and obtain humidity information according to an energy intensity of the tag reflection signal.   
     
     
         12 . The radio frequency radar device according to  claim 11 , wherein the demodulation unit comprises:
 a first demodulation circuit, coupled to the transmission unit and the receiving unit, receiving the incident radar signal from the transmission unit, and configured to demodulate the reflected radar signal according to a frequency corresponding to the incident radar signal, to obtain the body reflection signal; and   a second demodulation circuit, coupled to the transmission unit and the receiving unit, receiving the frequency-multiplied incident radar signal from the transmission unit, and configured to demodulate the reflected radar signal according to twice the frequency corresponding to the incident radar signal, to obtain the tag reflection signal.   
     
     
         13 . The radio frequency radar device according to  claim 11 , wherein the demodulation unit is a demodulation circuit, which receives the incident radar signal from the transmission unit, and is configured to demodulate the reflected radar signal according to a frequency corresponding to the incident radar signal. 
     
     
         14 . The radio frequency radar device according to  claim 13 , wherein the processing unit distinguishes the body reflection signal and the tag reflection signal according to a phase oscillation frequency of the reflected radar signal. 
     
     
         15 . The radio frequency radar device according to  claim 11 , wherein the processing unit determines the humidity information according to a result of comparing the energy intensity of the tag reflection signal with a threshold. 
     
     
         16 . The radio frequency radar device according to  claim 11 , wherein the processing unit determines the humidity information according to a result of comparing a variation amount of the energy intensity of the tag reflection signal with a threshold. 
     
     
         17 . The radio frequency radar device according to  claim 11 , wherein the processing unit distinguishes a type of the obtained vital information according to an oscillation frequency of the phase information. 
     
     
         18 . A radio frequency radar device, comprising:
 a transmission unit, configured to transmit two incident radar signals with different frequencies to a field;   a receiving unit, configured to receive a reflected radar signal corresponding to the field;   a first demodulation circuit, coupled to the transmission unit and the receiving unit, receiving the incident radar signal with a first frequency, and configured to demodulate the reflected radar signal according to the first frequency, to obtain a body reflection signal;   a second demodulation circuit, coupled to the transmission unit and the receiving unit, receiving the incident radar signal with a second frequency, and configured to demodulate the reflected radar signal according to the second frequency, to obtain a tag reflection signal; and   a processing unit, coupled to the transmission unit, the receiving unit, the first demodulation circuit, and the second demodulation circuit, and configured to obtain vital information according to phase information of the body reflection signal, and obtain humidity information according to an energy intensity of the tag reflection signal.   
     
     
         19 . The radio frequency radar device according to  claim 18 , wherein an antenna of the transmission unit comprises a millimeter-wave antenna and an ultra-high frequency band antenna. 
     
     
         20 . The radio frequency radar device according to  claim 18 , wherein the processing unit is configured to control the two incident radar signals to be transmitted alternately in a time-division duplex manner.