Patent ID: 8754770

Claim:
A system for beyond perimeter detection and early warning, comprising: a plurality of sensors positioned in a first field, each sensor of the plurality of sensors identified by a unique identifier; a plurality of reflectors positioned in a second field; and one or more transceivers, each transceiver comprising: a transmitter configured to transmit radio frequency (RF) signals, a first receiver configured to receive sensor signals from at least some of a set of the plurality of sensors in response to the transmitted RF signals, a second receiver configured to receive reflected signals from at least some of a set of the plurality of reflectors in response to the transmitted RF signals, a monitor module configured to detect a perturbed signal resulting from the received sensor signals and reflected signals, an alarm module configured to generate an alarm signal based on the detection of the perturbed signal, wherein: a) the second field is outside a first perimeter defined by the first field, b) the alarm signal is an early warning alarm signal indicating that an intruder has crossed a second perimeter defined by the second field, c) the detection of the perturbed signal is performed by making a comparison with a reference signal.