A simple non-contact vital sensing method using Doppler sensors applicable to multiple targets

Abstract

This paper proposed a new very simple method for non-contact vital sensing using Doppler sensors. It is emphasized that the proposed method can cope with multiple bodies even if they are closely located. The proposed method enables us to estimate (1) The number of signal (NOS), (2) the fundamental waveform, (3) the period, and (4) Direction of arrival (DOA), for each of the incoming signals. In addition, the proposed method is computationally effective so that it is advantageous for the hardware implementation. Some numerical examples are provided for performance verification.

Automatically Generated Data Mining Tools for Complex System Operator's Condition Detection Using Non-Contact Vital Sensing

“…Nowadays, there are various technologies that can be used for condition monitoring of operators of different complex systems. A Doppler sensor [4] is a device that allows us to realize a non-contact vital sensing, namely the vital sensing Copyright c 2021 The Institute of Electronics, Information and Communication Engineers without needing electrodes to be put on a body surface. It enables us to measure heartbeats, breathing and body motion without causing any stress which would affect the measurement [4].…”

“…A Doppler sensor [4] is a device that allows us to realize a non-contact vital sensing, namely the vital sensing Copyright c 2021 The Institute of Electronics, Information and Communication Engineers without needing electrodes to be put on a body surface. It enables us to measure heartbeats, breathing and body motion without causing any stress which would affect the measurement [4]. This technology is expected to enhance the performance of machine learning techniques used for the condition detection of the corresponding complex systems' operators and to improve their management.…”

“…However, in reality there are hardly any conventional works on the non-contact monitoring of heartbeats capable of coping with multiple bodies. Therefore, a new scheme to cope with multiple bodies was proposed in [4].…”

“…This can be done by standard sensors. However, for higher efficiency the non-contact vital sensing using the Doppler sensors introduced in [4] was applied for human condition monitoring. It was done because of their low computational complexity, which allows implementing them with smallscale processors so that the battery life can be extended, and it is one of the most important factors in the IoT context.…”