CPC A61B 5/0205 (2013.01) [A61B 5/725 (2013.01); A61B 5/7214 (2013.01); A61B 5/7257 (2013.01); A61B 5/7278 (2013.01); G01S 7/354 (2013.01); G01S 7/356 (2021.05); G01S 7/412 (2013.01); G01S 13/89 (2013.01); A61B 5/02444 (2013.01); A61B 5/0507 (2013.01); A61B 5/0816 (2013.01)] | 23 Claims |
1. A method of monitoring a plurality of subjects, the method comprising:
performing a first Fast Fourier Transform (FFT) on each frequency-modulated continuous wave millimeter wave (mm-wave) signal received by a respective virtual receiver of a virtual array of receivers to generate a plurality of outputs, each received mm-wave signal resulting from a unique transmitter-receiver pair of transmitter of a first plurality of transmitters and a receiver of a second plurality of receivers;
concatenating the plurality of outputs to generate a range-antenna plane, wherein the range-antenna plane includes signal magnitudes and phases for each virtual receiver of the virtual array of receivers;
performing a second FFT on the range-antenna plane to determine angle measurements of each subject of the plurality of subjects to generate a range-azimuth plane;
comparing and identifying each subject based upon a difference in the angle measurements between each subject;
and extracting a plurality of phase values in the range-azimuth plane that are each based on a range-angle bin associated with each subject.
|