System for detecting intruders in a populated space
First Claim
1. A system for monitoring the presence within a zone of persons having bodies, 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 and of characterizing the location of said body within the zone;
a second sensor arrangement capable of identifying the presence of at least one marker within the zone and of characterizing the location of said 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 having a characterized location at which the body is identified.
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Accused Products
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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Citations
19 Claims
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1. A system for monitoring the presence within a zone of persons having bodies, the system comprising:
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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 and of characterizing the location of said body within the zone; a second sensor arrangement capable of identifying the presence of at least one marker within the zone and of characterizing the location of said 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 having a characterized location at which the body is identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for monitoring the presence within a zone of persons having bodies by means of one or more remotely detectable markers, the method comprising:
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identifying the presence of the body of at least one person within the zone and characterizing the location of said body within the zone; identifying the presence of at least one marker within the zone and characterizing the location of that marker within the zone; and generating an alarm signal if the first sensor arrangement identifies the presence of a body without the second sensor arrangement identifying a marker having a characterized location at which the body is identified.
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18. A system for detecting the presence of unauthorized persons within a zone, the system comprising:
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one or more remotely detectable markers, each capable of being carried by a person; a first sensor arrangement capable of identifying the presence of at least one person within the zone and of counting the number of persons identified within the zone; a second sensor arrangement capable of identifying the presence of at least one marker within the zone and of counting the number of markers identified 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 number of persons identified by the first sensor arrangement does not correspond to the number of markers identified by the second sensor arrangement. - View Dependent Claims (19)
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Specification