Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2005-04-19
2005-04-19
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C342S387000
Reexamination Certificate
active
06882315
ABSTRACT:
An RF object locating system and method that uses or includes a set of N (N>2) receivers (monitoring stations) located at fixed positions in and/or about a region to be monitored, one or more reference transmitters that transmit a timing reference, a location processor that determines object location based on time-of-arrival measurements, and at least one object having an untethered tag transmitter that transmits RF pulses, which may additionally include object ID or other information. Free-running counters in the monitoring stations, whose phase offsets are determined relative to a reference transmitter, are frequency-locked with a centralized reference clock. Time-of-arrival measurements made at the monitoring stations may be stored and held in a local memory until polled by the location processor. The invention permits rapid acquisition of tag transmissions thereby enabling the monitoring of large numbers of objects, and also provides a unique approach to data correlation in severe multipath environments.
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Ameti Aitan
Fontana Robert J.
Perino Donald V.
Richley Edward A.
McIntyre Harbin & King
Mull F H
Multispectral Solutions, Inc.
Tarcza Thomas H.
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