Granted Patent
B2
US 12,274,527 · App. 17/435,580 · Granted Apr 15, 2025
Radar cardiography: a precise cardiac data reconstruction method
A61B5/0015A61B5/0044A61B5/02405A61B5/0507A61B5/0816A61B5/1128A61B5/1135A61B5/16A61B5/7207A61B5/7257G01S7/415G01S13/0209G01S13/18G01S13/89
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Abstract
A precise cardiac data reconstruction method is provided, which may also be referred to herein as radar cardiography (RCG). RCG can reconstruct cardiac data, such as heart rate and/or electrocardiogram (ECG)-like heartbeat waveform signals wirelessly by using advanced radar signal processing techniques. For example, heartbeat and related characteristics can be monitored by isolating cardiovascular activity from strong respiratory interference in spatial spaces: azimuth and elevation. This results in significant improvements to pulse signal-to-noise-ratio (SNR) compared to conventional approaches, facilitating heart-rate variability (HRV) analysis.
Claims (20)
1. An unmanned aerial vehicle (UAV), comprising:
a radar sensor; and
a signal processor configured to:
receive a first radar signal from the radar sensor;
locate a potential human subject in the first radar signal;
receive a second radar signal from the radar sensor focused to the potential human subject; and
extract a vital sign signal of the potential human subject using the second radar signal, wherein extracting the vital sign signal using the second radar signal comprises:
monitoring first reflections of the second radar signal in radar image pixels, each radar image pixel of the radar image pixels being associated with a different three dimensional (3-D) region in space;
locating a region of interest based on the first reflections of the second radar signal; and
continuing to monitor second reflections of a proper subset of the radar image pixels associated with the region of interest to extract a heartbeat waveform from the region of interest.
2. The UAV of claim 1 , wherein extracting the vital sign signal comprises:
determining background noise in the second radar signal; and
suppressing the background noise.
3. The UAV of claim 1 , wherein extracting the vital sign signal comprises:
estimating motion interference in the second radar signal; and
suppressing the motion interference to extract the vital sign signal.
4. The UAV of claim 1 , wherein the signal processor is further configured to cause the UAV to move toward the potential human subject in response to locating the potential human subject.
5. The UAV of claim 4 , wherein extracting the vital sign signal comprises:
estimating motion interference from the UAV in the second radar signal; and
suppressing the motion interference to extract the vital sign signal.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Sep 1, 2021
From: BLISS, DANIEL W.; RONG, YU
To: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY
Reel/Frame 057358/0371 →
Continuity (2)
Provisional Application
62821119
· Mar 20, 2019
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