A hybrid chaos-Doppler radar for through-wall life detection

Abstract

We experimentally demonstrate a hybrid radar system that incorporates a wideband Boolean-chaos mode and a phase-based Doppler mode for human localization and life signal (respiration and heartbeat) monitoring. The measurement principle and signal-processing technology allow this radar to work simultaneously at two different modes for different purposes. The wideband Boolean-chaos mode is responsible for accurate range detection while the phase-based Doppler mode is utilized for life signal monitoring. Experimental results show that the proposed hybrid radar can realize the simultaneous detection for range and life signal with high-range resolution, high sensitivity, and large dynamic range. The down-range resolution and dynamic range for range detection behind a 20-cm-thick wall are 15 cm and 50 dB, respectively. Meanwhile, the dynamic ranges for heartbeat and respiration detection are 10 and 50 dB, respectively.

Keywords:

• Life-detection radar
• Boolean chaos
• correlation method
• micro-Doppler
• Michelson interference principle

Additional information

Funding

This work was supported by the Natural Science Foundation of China [grant number 61601319], [grant number 41604127], [grant number 41704147]; the Natural Science Foundation of Shanxi Province [grant number 201701D221114]; the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [grant number 2017136]; the Social Development Project of Shanxi Province Key Research Plan [grant number 201703D321037].