Patent ID: 7573384
Filing Date: 2009-08-11
Classification: G01V,G08B

Abstract:
1. A method for detecting and classifying signals as deriving from an environmental disturbance or as deriving from an attempt at malicious action at an installation under surveillance, based on signals provided by a plurality of sensors distributed near the installation, comprising: receiving a first signal from by a first sensor of the plurality of sensors in reply to an external event; filtering the received first signal with a first filter having a first pass band overlapping a first portion of spectrum to obtain a first intensity value, the first portion of the spectrum typically occupied by signals from the sensors in reply to attempts at malicious action; filtering the received first signal with a second filter having a second pass band overlapping a second portion of spectrum to obtain a second intensity value, the first portion of the spectrum typically occupied by signals from the sensors in reply to environmental disturbances; comparing the first and second filtered signals; classifying the received first signal as deriving from an environmental disturbance in response to the first filtered signal having the first intensity value lower than the second intensity value; classifying the received first signal as deriving from a malicious action in response to the first filtered signal having the first intensity value greater than the second intensity value; and in response to determining that the first signal is derived from the malicious action,