US 12,440,117 B2
FMCW radar target detection method for vital signal detection
Sung Ho Lee, Seoul (KR); Min Geon Shin, Seongnam-si (KR); and Yong Chul Jung, Seoul (KR)
Assigned to Korea Electronics Technology Institute, Seongnam-si (KR)
Filed by Korea Electronics Technology Institute, Seongnam-si (KR)
Filed on Dec. 21, 2022, as Appl. No. 18/085,817.
Claims priority of application No. 10-2021-0187049 (KR), filed on Dec. 24, 2021.
Prior Publication US 2023/0200672 A1, Jun. 29, 2023
Int. Cl. A61B 5/05 (2021.01); A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61B 5/024 (2006.01); A61B 5/08 (2006.01)
CPC A61B 5/05 (2013.01) [A61B 5/0205 (2013.01); A61B 5/7203 (2013.01); A61B 5/7246 (2013.01); A61B 5/725 (2013.01); A61B 5/7257 (2013.01); A61B 5/024 (2013.01); A61B 5/0816 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for detecting vital signals by using radar, the method comprising:
converting radar signals which are pre-processed after being reflected and received from a human body into a plurality of range bins;
tracking a peak range bin among the plurality of range bins;
extracting phase signals of the plurality of range bins comprising the peak range bin;
extracting magnitude signals of the plurality of range bins comprising the peak range bin;
unwrapping the phase signals based on an adaptive reference value;
selecting one range bin from the plurality of range bins based on a correlation coefficient between signals of the selected range bin, with respect to the phase signals and the magnitude signals,
wherein the adaptive reference value is adaptively determined based on a distance change or displacement between the radar and the human body caused by a motion other than the vital signals and a sampling frequency for the phase signals; and
detecting the vital signals by using the unwrapped phase signals regarding the selected range bin.