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Remote measurement of breath and heartbeat is desirable in many situations. It avoids the discomfort result- ing from electrodes applied on the skin for long-term patients or during sports acvtivities. Also, surveillance of high secu- rity areas or finding survivors of disasters are interesting ap- plications. Common methods identify the movement of heart and thorax by using the range resolution provided by UWB pulse radar systems. In this paper a low-cost approach is pre- sented, that is based on detection of movement by means of Doppler radar sensors. Combining three sensors working in the ISM bands at 433 MHz, 2.4 GHz and 24 GHz, the pres- ence of persons was reliably detected and the frequency of breath and heartbeat was measured.

Multi-frequency sensor for remote measurement of breath and heartbeat