Radar-Based Noncontact Measurement of Heartbeat of Humans and Chimpanzees Using Millimeter-Wave Radar with Topology Method

TL;DR

This paper introduces a radar-based noncontact method using the topology approach to accurately measure heartbeats in humans and chimpanzees, effectively filtering out respiratory signals with minimal error.

Contribution

It develops a novel filter parameter setting technique for the topology method, enabling precise heartbeat measurement in both humans and chimpanzees using millimeter-wave radar.

Findings

Measurement errors as low as 4.43 ms for humans

Measurement errors as low as 2.55 ms for chimpanzees

Effective noncontact heartbeat monitoring demonstrated

Abstract

This study proposes a method to determine the filter parameters required for the topology method, which is a radar-based noncontact method for measurement of heart inter-beat intervals. The effectiveness of the proposed method is evaluated by performing radar measurements involving both human participants and chimpanzee subjects. The proposed method is designed to enable setting of the filter cutoff frequency to eliminate respiratory components while maintaining the higher harmonics of the heartbeat components. Measurements using a millimeter-wave radar system and a reference contact-type electrocardiogram sensor demonstrate that the smallest errors that occur when measuring heart inter-beat intervals using the proposed method can be as small as 4.43 and 2.55 ms for humans and chimpanzees, respectively. These results indicate the possibility of using noncontact physiological measurements to monitor both humans and chimpanzees.