Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Patent
1998-04-06
2000-08-15
Nguyen, Tan
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
701213, 701214, 342457, H04B 7185, G01S 502
Patent
active
061049786
ABSTRACT:
A communication method reduces both the asset energy requirements and communication channel occupancy in a reduced order GPS asset tracking system. The asset is provided with an indication of its position so as to allow detection of substantial movement of the asset at the asset. Reduced order GPS data derived at the asset, such as a railcar, is compressed to allow for shorter railcar data transmission times. This, in turn, reduces both the transmitter energy requirements and communication-channel occupancy, while allowing substantial railcar position changes to be conveniently detected at the railcar. This capability can be used to save further substantial railcar energy by, for example, reporting to the central station less frequently when the railcar position is unchanging.
REFERENCES:
patent: 5663735 (1997-09-01), Eshenbach
patent: 5682139 (1997-10-01), Pradeep et al.
patent: 5691980 (1997-11-01), Welles, II et al.
patent: 5752218 (1998-05-01), Harrison et al.
patent: 5883594 (1999-03-01), Lau
Harrison Daniel David
Welles II Kenneth Brakeley
General Electric Company
Nguyen Tan
Snyder Marvin
Stoner Douglas E.
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