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We have assembled, programmed, and demonstrated a robot-mounted motion-detection radar suitable for through-wall operation. Our radar, which employs pulse-Doppler techniques, is designed to look through building walls and locate moving targets. The radar's signal-processing algorithms use both time-domain and frequency-domain clues to classify detected motion as arising from: (1) the ambient background; (2) mechanical motion; or (3) human activity. In the case of human motion, our routines also attempt to identify the occupant's particular activity, e.g., resting, walking, talking.

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