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Doppler radar has been used to search survivors buried under earthquake rubble by contact-free detection of respiration signals. However, the respiration signals were minute and easy to be polluted by noise from moving-object around the survivor such as swing of flowers, leaves and bushes. In order to restrain the noise and improve the signal-to-noise ratio (SNR), the Adaptive Line Enhancer (ALE)...
This paper proposed a LMS adaptive harmonic cancellation algorithm, in order to effectively separate the breathing and heartbeat signal from biological radar, so that the physiological characteristic parameter (respiration rate and heart rate) can be real-time monitored. The harmonic combination of the respiratory signal is regarded as reference input of the model, and the bio-radar body motion signal...
It has been proven that the cardiopulmonary signs, including respiration and heartbeat signal, can be contact-free measured via a Doppler radar. However, the heartbeat signal cannot be identified when the human subject does not hold his or her breath. To resolve the problem, the adaptive noise canceller (ANC) based on recursive-least square (RLS) algorithm is presented to simultaneously measure the...
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