| 摘要 |
A system for beyond perimeter detection and early warning may comprise multiple sensors positioned in a first field, a number of reflectors positioned in a second field outside a first perimeter defined by the first field, and one or more transceivers. Each transceiver may comprise a transmitter to transmit radio frequency (RF) signals, a first and a second receiver to receive signals from some of a set of the of the multiple sensors and reflected signals from some/all of the reflectors in response to the transmitted RF signals. The transceiver may also include a monitor module to detect a perturbed signal resulting from the received sensor signals and reflected signals, and an alarm module to generate an early warning alarm signal based on the detection of the perturbed signal to indicate that an intruder has crossed a second perimeter defined by the second field.
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