Amultifrequency radar system for detecting humans and classifying their activities at short and long ranges is described.The shortrange\nradar system operates within the S-Band frequency range for through-wall applications at distances of up to 3m. It utilizes\ntwo separate waveforms which are selected via switching: a wide-band noise waveform or a continuous single tone. The long-range\nradar system operating in the W-Band millimeter-wave frequency range performs at distances of up to about 100m in free space\nand up to about 30m through light foliage. It employs a composite multimodal signal consisting of two waveforms, a wide-band\nnoise waveformand an embedded single tone, which are summed and transmitted simultaneously.Matched filtering of the received\nand transmitted noise signals is performed to detect targets with high-range resolution, whereas the received single tone signal is\nused for the Doppler analysis. Doppler measurements are used to distinguish between different human movements and gestures\nusing the characteristic micro-Doppler signals. Our measurements establish the ability of this system to detect and range humans\nand distinguish between different human movements at different ranges.
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