Patent ID: 6529130
Filing Date: 2003-03-04
Classification: G08B

Abstract:
A method of detecting an intruder, comprising the steps of providing a sensor which senses an action generated by an intruder and produces a signal; determining portions of the signal from individual steps and making values of the signal within these portions closer to one another; determining a main amplitude threshold; obtaining an enveloping line of initial data of the signal; determining maximum values of amplitudes of the enveloping line and time points corresponding to the maximum amplitudes; determining an average value of time intervals between neighboring maximums of amplitudes and an average square value of the intervals from the average value; making more accurate the average value of time intervals between neighboring maximums of amplitudes of the enveloping line and average squared deviation of the time intervals from an average value; and making a decision about a presence of an intruder from the thusly determined values.