Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-07-26
2005-07-26
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S554000, C340S555000, C340S556000, C340S557000, C340S506000
Reexamination Certificate
active
06922145
ABSTRACT:
Overlapping range rings from a pair of non-scanning radar or sonar transducers creates a grid structure within a surveillance area defined by their overlapping beam widths. Using PN coded transmission signals and doppler signal processing, intruder targets are detected, located, and tracked as they move throughout the grid structure. Intruders are identified by comparing their movement pattern to those of known intruders. Three dimensional surveillance areas can be monitored using three or more transducer sites.
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