Wireless motion sensor using ultra-wideband impulse-radio

Ultra-wideband impulse-radio (UWB-IR) has lately attracted considerable attention because of high range-resolution, penetration against blanket and clothes, low power spectral emission and so on. In medical care or geriatric health care facilities, therefore it is expected to detect the small movement of a resident such as breathing with a remote non-contact approach which is unique as compared with conventional sensors such as infra-red and narrow-band radio. This paper suggests a wireless motion sensor using UWB-IR, which detects various movements of a resident vacating a bedside, room or designated area. It can also monitor the resident´s respiration rate in bed. In this paper the measurement was conducted for several scenarios and the usefulness is investigated. As a result, it is found to be useful for ant-wandering and respiratory monitoring.