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Open AccessTechnical Note

Heart ID: Human Identification Based on Radar Micro-Doppler Signatures of the Heart Using Deep Learning

Key Laboratory of Radar Imaging and Microwave Photonics (Nanjing Univ. Aeronaut. Astronaut.), Ministry of Education, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Street, Nanjing 211100, China
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(10), 1220;
Received: 1 April 2019 / Revised: 15 May 2019 / Accepted: 16 May 2019 / Published: 23 May 2019
PDF [7300 KB, uploaded 23 May 2019]
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Human identification based on radar signatures of individual heartbeats is crucial in various applications, including user authentication in mobile devices, identification of escaped criminals, etc. Usually, optical systems employed to recognize humans are sensitive to ambient light environments, while radar does not have such a drawback, since it has high penetration and all-weather capability. Meanwhile, since micro-Doppler characteristics from the heart of different people are distinct and not easy to fake, it can be used for identification. In this paper, we employed a deep convolutional neural network (DCNN) and conventional supervised learning methods to realize heartbeat-based identification. First, the heartbeat signals were acquired by a Doppler radar and processed by short-time Fourier transform. Then, predefined features were extracted for the conventional supervised learning algorithms, while time–frequency graphs were directly inputted to the DCNN since the network had its own feature extraction part. It is shown that the DCNN could achieve average accuracy of 98.5% for identifying four people, and higher than 80% when the number of people was less than ten. For conventional supervised learning algorithms when identifying four people, the accuracy of the support vector machine (SVM) was 88.75%, and the accuracy of SVM–Bayes was 91.25%, while naive Bayes had the lowest accuracy of 80.75%. View Full-Text
Keywords: human identification; micro-Doppler; heartbeat; DCNN; SVM; NB; SVM–Bayes fusion human identification; micro-Doppler; heartbeat; DCNN; SVM; NB; SVM–Bayes fusion

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Cao, P.; Xia, W.; Li, Y. Heart ID: Human Identification Based on Radar Micro-Doppler Signatures of the Heart Using Deep Learning. Remote Sens. 2019, 11, 1220.

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