INFRARED INTRUDER RECOGNITION METHOD AND APPARATUS

摘要

A method for determining whether to raise an alarm in response to an intruder that trespasses a security zone of a Passive Infra-Red (PIR) system comprising: collecting IR radiation from said security zone; providing an intruder signal responsive to said collected IR radiation; determining at least one pulse interval characteristic of said intruder signal; determining a characteristic voltage for said intruder signal; determining a signal threshold for said characteristic voltage responsive to said at least one pulse interval; and generating an alarm if said characteristic voltage is greater than said signal threshold.