Harmonics Cancellation in Noncontact Microwave Doppler Radar Cardiopulmonary Sensing
نویسندگان
چکیده
This paper addresses the challenge of respiration harmonics cancellation in microwave Doppler radar cardiopulmonary sensing. A new signal processor based on adaptive noise cancellation is proposed. When the heartbeat signal is easily overwhelmed by the respiration harmonics, the traditional band-pass filters are used to separate heartbeat signal from the respiration signal, then the LMS-based multi-notch filter is implemented to filter the respiration harmonics. Experimental results from a 2.4GHz continuous wave Doppler radar show that the respiration harmonics can be effectively removed and more accurate measurement of heartbeat rates can be obtained.
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