US 11,850,027 B2
Multi-person vital signs monitoring using millimeter wave (mm-wave) signals
Dan Wang, Allen, TX (US); June Chul Roh, Allen, TX (US); and Adeel Ahmad, Plano, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Aug. 8, 2022, as Appl. No. 17/883,028.
Application 17/883,028 is a continuation of application No. 15/717,756, filed on Sep. 27, 2017, granted, now 11,412,937.
Claims priority of provisional application 62/478,297, filed on Mar. 29, 2017.
Prior Publication US 2022/0378313 A1, Dec. 1, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/0507 (2021.01); G01S 13/89 (2006.01); G01S 7/35 (2006.01); G01S 7/41 (2006.01); A61B 5/0205 (2006.01); A61B 5/08 (2006.01); A61B 5/024 (2006.01)
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
OG exemplary drawing
 
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.