Patent ID: 6909370
Filing Date: 2005-06-21
Classification: G08B

Abstract:
1. An intruder detection method for detecting an object which enters detection areas covered by detection elements and outputting a detection signal to a monitoring station, said intruder detection method comprising: separating an entire detection area into a plurality of detection areas covered by a plurality of detection elements, respectively, with a separation system such that the detection areas do not overlap each other, wherein one of the detection elements covers a detection area which extends at least along an external periphery of the entire detection area; if an object is detected in one or more detection areas respectively by one or more of the detection elements, generating detection signals from the one or more respective detection elements; and on receiving the detection signals from the one or more respective detection elements, judging that the object is an intruder and outputting the detection signals, independently of each other, to the monitoring station, if the object is detected by the detection element which covers the detection area which extends at least along the external periphery of the entire detection area and the object is later detected by another of the detection elements which covers another detection area.