Communications: directive radio wave systems and devices (e.g. – Determining distance – With remote cooperating station
Reexamination Certificate
2005-08-30
2008-08-19
Lobo, Ian J (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With remote cooperating station
C342S127000, C340S572100, C340S870030
Reexamination Certificate
active
07414571
ABSTRACT:
An apparatus and method for low frequency asset tracking includes a low frequency transmitter tag associated with a cargo container or other high value commodity, a plurality of receivers that detect low frequency signals, and a microprocessor that uses algorithms and/or data pertaining to the propagation characteristics of the signal to locate the position of the container or high value commodity. The tag may include sensors to monitor container properties or conditions, such as temperature, motion, intrusion, RF fields, or other properties of interest. Sensor data may be modulated on the low frequency transmitter signal.
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DePierre Robert E.
Schantz Hans Gregory
Lobo Ian J
Q-Track Corporation
Richards James
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