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Many of sensing techniques have been applied on basic physiological signal detection for clinical diagnosis and home healthcare. Most known maturely developed sensing methods (EEG/ECG/EMG/Temperature/BP etc. al.) replied on contact way to obtain desired physiological information for further data analysis. However, those methods might cause some inconvenient and uncomfortable problems, and not easy to be used for affective analysis in interactive performing. To improve this issue, a novel technology based on low power radar technology (Nanosecond Pulse Near-field Sensing, NPNS) with 300MHz radio-frequency was proposed to detect humans´ pulse signal by the non-contact way for heartbeat signal extraction. In this paper, a NPNS based wearable sensor was also developed and applied on measuring the heartbeat signal from small artery at human head site. The proposed sensing technology is designed to continuously collect the humans´ physiological signal, and validated in a preliminary experiment with ECG measurement. As a result, the accuracy of heart rate measurement can be over 95% with activity.