Zone detection locator

Details Zone detection locator Zone detection locator

2005-07-12

2005-07-12

Pope, Daryl C (Department: 2632)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S539110, C340S539130, C340S539210, C340S573400, C340S870030, C340S870030

Reexamination Certificate

active

06917290

ABSTRACT:
A method and apparatus for a zone detection system in which assets and personnel to be monitored are assigned a transmitter that emits a transmitter signal that includes a common code and a unique code. Processing requirements associated with restricted zone monitoring are reduced by scanning received signals for the single common code or a relatively small number of common codes. Processing requirements associated with locating an individual transmitter are reduced by scanning for a single transmitter signal. Transmitter signals are relayed by sub-sector RF-relays to a centralized sector signal processing computer. One or more signal processing computers interface with a system controller that supports a centralized user interface configurable to manage one or more sectors. CDMA matched filter techniques, power signature maps, and two-dimensional/three-dimensional convolution techniques are used to efficiently detect signals and to refine the estimated location a specific transmitter or a group of transmitters.

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