Reliable security system by triangulation

Details Reliable security system by triangulation Reliable security system by triangulation

2011-07-12

2011-07-12

Hunnings, Travis R (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S565000

Reexamination Certificate

active

07978069

ABSTRACT:
The present invention is a security system and a method for reliably detecting an intruder without false alarms. The security system includes at least three motion detectors and processor circuitry adapted to collect a plurality of location samples and analyze them to determine if a target has transitioned from a first region to a second region, and when the target has transitioned from a first region to a second region, initiating a predetermined action. Each location sample is determined by: detecting motion from a target with each of the three motion detectors, determining the distance to the target for each of the three motion detectors, and triangulating the three determined distances to produce a two-dimensional location. The security system determines if a target has transitioned from a first region to a second protected region by comparing the plurality of location samples to perimeter location data stored in memory. Different modes of operation cause the security system to take different actions before and after the transition, such as generating an alarm or a warning signal. The security system may also include a display to show the location of one or more targets, which may be the intruder or the occupants of the premises.

REFERENCES:
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patent: 6307475 (2001-10-01), Kelley
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patent: 7084761 (2006-08-01), Izumi et al.
patent: 2004/0032326 (2004-02-01), Nakamura et al.
patent: 2007/0120667 (2007-05-01), Mainini et al.

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