| CPC G01S 7/354 (2013.01) [G01S 7/415 (2013.01); A61B 5/05 (2013.01); G01S 7/356 (2021.05)] | 23 Claims |
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1. A frequency modulated continuous wave (FMCW) radar, comprising:
a transmitter configured to transmit a plurality of chirp signals; and
a receiver configured to receive reflected chirp signals, generate a plurality of digital signals corresponding to the chirp signals, superpose the digital signals to obtain an output signal, and calculate a moving speed or a periodic-movement frequency of a to-be-detected object by performing Doppler Fourier transform according to the output signal so as to obtain movement information or physiological information of the to-be-detected object;
wherein the receiver is further configured to:
performing a Distance Fourier transform on a plurality of the output signal to obtain a plurality of frequency domain detection signals;
reshaping the plurality of frequency domain detection signals into a two-dimensional array, each row of the two-dimensional array includes one of the plurality of frequency domain detection signals;
generating statistical information by calculating statistical values of each column of the two-dimensional array;
normalizing the frequency domain detection signals according to the statistical information;
determining, according to a machine learning model, whether the to-be-detected object is present; and
performing the Doppler Fourier transform on the two-dimensional array to obtain the movement information or the physiological information of the to-be-detected object, when determining that the to-be-detected object is present.
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