Bidirectional bistatic radar perimeter intrusion detection system

摘要

An intruder detection system is provided including a pair of detection nodes 12,14, each node comprising wireless communication means for supporting a bidirectional wireless communication link across which each node is capable of sending a wireless signal to, and receiving a wireless signal from, the other paired node. The wireless signals create an electromagnetic field defining a detection zone 22 between the paired nodes. Each node analyses the wireless signal received from the other node to detect one or more characteristics of the received signal that is indicative of a disturbance in the electromagnetic field caused by the presence of a target 24 in the detection zone.