Application of GPS to a railroad navigation system using two sat

Details Application of GPS to a railroad navigation system using two sat Application of GPS to a railroad navigation system using two sat

1996-10-23

1999-02-02

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

701217, 701221, H04B 7185, G01S 502

Patent

active

058671226

ABSTRACT:
A method for determining the location of a vehicle whose movement is constrained to a route whose location is fixed and known, such as a train. An initial estimate of location is made based upon information contained in a route database based on distance traveled from a reset point. The accuracy of the estimated vehicle location is improved through use of just two global positioning satellites.

REFERENCES:
patent: 5129605 (1992-07-01), Burns et al.
patent: 5541845 (1996-07-01), Klein

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