US 12,465,234 B2
Method and system for contactless vital sign monitoring via calculating displacement signal by applying adaptive nonlinear least squares method
Gabriel Tedgue Beltrao, Belvaux (LU); Wallace Alves Martins, Auzeville-Tolosane (FR); Bhavani Shankar Mysore Rama Rao, Luxembourg (LU); Mohammad Alaeekerahroodi, Luxembourg (LU); Udo Schröder, Föhren (FR); and Dimitri Tatarinov, Trier (DE)
Assigned to IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., Echternach (LU); and UNIVERSITÉ DU LUXEMBOURG, Luxembourg (LU)
Appl. No. 18/879,775
Filed by IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., Luxembourg (LU); and UNIVERSITE DU LUXEMBOURG, Luxembourg (LU)
PCT Filed Jun. 27, 2023, PCT No. PCT/EP2023/067534
§ 371(c)(1), (2) Date Dec. 29, 2024,
PCT Pub. No. WO2024/003086, PCT Pub. Date Jan. 4, 2024.
Claims priority of application No. 502427 (LU), filed on Jun. 30, 2022; and application No. 503103 (LU), filed on Nov. 24, 2022.
Prior Publication US 2025/0160671 A1, May 22, 2025
Int. Cl. A61B 5/05 (2021.01); A61B 5/00 (2006.01); A61B 5/0245 (2006.01); A61B 5/11 (2006.01); A61B 5/113 (2006.01)
CPC A61B 5/05 (2013.01) [A61B 5/0245 (2013.01); A61B 5/1126 (2013.01); A61B 5/113 (2013.01); A61B 5/7228 (2013.01); A61B 5/725 (2013.01); A61B 5/7257 (2013.01); A61B 5/7275 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for vital sign monitoring using a radar sensor system,
the radar sensor system comprising a transmitter, a receiver and processing device, wherein:
the transmitter irradiates at least one body region of an object with radar radiation;
the receiver generates a receiver signal from reflected radiation from the at least one body
region; and
the processing device generates, for each of a plurality of processing windows that represent time intervals, a displacement signal based on the receiver signal, which displacement signal characterizes a body motion comprising, as oscillating motions, a breathing motion and a heartbeat motion, and calculates an estimated fundamental frequency for at least one oscillating motion,
wherein the processing device combines single-bin displacement signals from a plurality of position bins, depending on a correlation of these single-bin displacement signals, to obtain an aggregate displacement signal, wherein the processing device, based on the aggregate displacement signal, applies an adaptive Nonlinear Least Squares method to calculate a plurality of frequency estimates, each of which corresponds to one of a plurality of harmonics of a first oscillating motion, and wherein the processing device uses an individual search region for each frequency estimate, adapts at least one search region for at least one processing window, and calculates a first estimated fundamental frequency for the first oscillating motion based on the frequency estimates wherein at least one of the breathing motion or the heartbeat motion of the object is monitored.