Patent ID: 7342493

Claim:
A motion-monitoring apparatus comprising: at least one antenna fixed within a barrier, the at least one antenna transmitting at least one first radio-frequency signal through the barrier to at least one volume outside the barrier, the at least one first radio-frequency signal reflecting from at least one object in the at least one volume to produce a plurality of second radio-frequency signals, the plurality of second radio-frequency signals being received by the at least one antenna; at least one sensing circuit sensing the plurality of second radio-frequency signals, the at least one sensing circuit generating a plurality of time-domain output signals; at least one processor receiving the plurality of time-domain output signals, the at least one processor comparing at least one successive time-domain output signal to at least one previous time-domain output signal to estimate at least one characteristic of the at least one object, the at least one characteristic including a motion of the at least one object; and at least one monitor device remotely disposed from the at least one antenna, the at least one monitor device monitoring the at least one characteristic.