System for detecting intruders

• US 6,529,130 B2
• Filed: 02/16/2001
• Issued: 03/04/2003
• Est. Priority Date: 02/16/2001
• Status: Expired due to Fees

• Current Assignee: General Phosphor
• Original Assignee: General Phosphorix LLC
• Inventors: Pakhomov, Alex
• Primary Examiner(s): Wu, Daniel J.
• Assistant Examiner(s): Huang, Sihong
• Application Number:
  US09/788,235
• Publication Number:
  US 20020113698A1
• Time in Patent Office: 746 Days
• Field of Search: 340/541, 340/566, 340/567, 340/565, 340/552, 340/544
• US Class Current: 340/566
• CPC Class Codes: G08B 13/00 Burglar, theft or intruder alarms
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components

Abstract

Detection of an intruder includes 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 with this portion 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 of an 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, as well as other parameters, and making a decision about a presence of an intruder from the thusly determined parameters.

Claims

1. 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.

2. A method as defined in claim 1;

and further comprising, before making portions of signals from separate steps closer to one another, filtering of the signal in order to filter out an influence of seismic-acoustic and vibration noise.

3. A method as defined in claim 1, wherein said obtaining an enveloping line includes obtaining by a method selected from the group consisting of a digital detecting of the signal, an average square averaging of the amplitudes of the signal, and both.

4. A method as defined in claim 1, wherein said making a decision based on corresponding parameters includes determination of whether a deviation of a corresponding parameter is above or below a certain threshold and within a certain range.