System and methods for detecting change in a monitored...

Details System and methods for detecting change in a monitored... System and methods for detecting change in a monitored...

2006-10-05

2010-06-08

Goins, Davetta W (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S539220, C340S511000, C340S541000, C340S561000, C340S565000

Reexamination Certificate

active

07733220

ABSTRACT:
Systems and methods are provided for detecting changes in a monitored environment. One aspect of the invention relates to a system that comprises a plurality of radio frequency (RF) sensors distributed about the monitored environment, such that each RF sensor configured to respond to an interrogation signal with a unique identifier and a radio frequency (RF) interrogator that transmits interrogation sequences of interrogations signals over a plurality of different frequency bands at one or more power levels. The system also includes a response pattern analyzer that determines response patterns for each of the plurality of RF sensors to the interrogation sequences and transmits a change detection indicator if at least one of the determined response patterns vary outside a predetermined background baseline.

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