System for detecting intruders in a populated space

Details System for detecting intruders in a populated space System for detecting intruders in a populated space

2005-07-25

2008-12-16

Nguyen, Tai (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S540000, C340S541000, C340S528000, C340S545100, C340S556000, C340S572100, C340S572400, C340S573400, C340S005200, C340S686600, C340S870030

Reexamination Certificate

active

07466224

ABSTRACT:
A system for monitoring the presence of persons within a zone, the system comprising: one or more remotely detectable markers, each capable of being carried by a person; a first sensor arrangement capable of identifying the presence of the body of at least one person within the zone; a second sensor arrangement capable of identifying the presence of at least one marker within the zone; and a processing arrangement responsive to the first sensor arrangement and the second sensor arrangement to generate an alarm signal if the first sensor arrangement identifies the presence of a body without the second sensor arrangement identifying a marker corresponding in a first predetermined manner to that body.

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Michael D. Addlesse, et al. “The ORL Active Floor”IEEE Personal Communications, vol. 4, No. 5, Oct. 1997, pp. 35-41.

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