FIELD: information technology.
SUBSTANCE: intrusion detection system for monitoring a territory includes at least one optical cable, which includes at least one optical fibre and passes along the boundary of the territory, where the optical time-domain reflectometry apparatus is operationally connected to the opposite first and second ends of at least one optical fibre. Said optical reflectometry apparatus includes a first signal processing circuit which analyses a back-scatter signal received through the first end of at least one optical fibre for detecting intrusion on the territory, and a second signal processing circuit which analyses a back-scatter signal received from the second end of at least one optical fibre for detecting intrusion on the territory. The system also includes apparatus for detecting disruption in at least one fibre, for determining the location of the disruption, for informing the user on the location of the disruption, and for triggering an alarm signal signalling the disruption.
EFFECT: high reliability of detecting intrusion with determination of the position of the disruption.
15 cl, 6 dwg
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