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Falling is a primary public problem which will cause serious injuries, especially for senior people aged over 65. Therefore, various fall detection systems are designed and developed. However, in existing researches, very few researchers use wearable radio frequency device to monitor the signature of human leg and detect fall event. In this paper, a feasibility study of all-time gait monitoring using wearable K-band Doppler radar is presented. In the experiment, a radar sensor was mounted on the subject's right ankle or right knee to capture the Doppler frequency. Experiment results are compared to show different features of Doppler information in different movements. Measurement results demonstrate the feasibility of fall detection using wearable onboard radar system.
Tang et al. (2016) studied this question.