Non-contact detection of Doppler bio-signals based on gradient decent and extended DACM algorithms

In this paper, we present a Doppler radar sensor based approach capable of detecting both small- and large-scale biological motions. To fully recover the time domain motion information from backscattered microwave signals, the gradient descent and the extended DACM algorithms are utilized to solve the problems caused by DC offset and phase wrapping issues. Experimental results show that both Doppler bio-signals of the small-scale human cardiac motion and the large-scale human walk can be accurately detected. The proposed approach provides a generalized method for detecting different Doppler bio-signals in biomedical and healthcare applications.