Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1998-02-20
2000-08-22
Vo, Nguyen
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455101, 455507, H04B 1700
Patent
active
061085243
ABSTRACT:
An asymmetrical (inbound only) high frequency communication system for asset tracking is made up of a message preparation and transmitter subsystem, a receiving subsystem, and a system monitoring subsystem. A transmission channel is selected randomly or pseudorandomly. Prior to each transmission, the transmitter performs a radiometric measurement of a selected channel. If the measurement exceeds a predetermined threshold, transmission in the selected channel is canceled and another channel is selected. The transmission protocol achieves frequency diversity by sequentially transmitting a message on a plurality of different channels. The receiving subsystem has a plurality of spatially separated receiver sites at various geographical points, thereby providing spatial diversity. The receiver sites are linked to a common processing center. Onboard the asset and collocated with the transmitter, a system monitoring subsystem records and stores parameters related to the message preparation and transmitter subsystem. These parameters are useful in assessing efficacy of transmission frequency planning algorithms and the transmission protocol.
REFERENCES:
patent: 5203012 (1993-04-01), Patsiokas et al.
patent: 5239584 (1993-08-01), Hershey et al.
patent: 5588005 (1996-12-01), Ali et al.
patent: 5917433 (1999-06-01), Keillor et al.
Fergus Ross John Anderson
Hershey John Erik
Lester Howard LeRoy
Banks-Harold Marsha D.
Breedlove Jill M.
General Electric Company
Thompson John F.
Vo Nguyen
LandOfFree
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