Train navigator with integral constrained GPS solution and...

Details Train navigator with integral constrained GPS solution and... Train navigator with integral constrained GPS solution and...

2006-05-03

2009-10-27

To, Tuan C (Department: 3663)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C700S029000, C700S033000, C700S055000, C700S078000

Reexamination Certificate

active

07610152

ABSTRACT:
The present invention provides a new set of algorithmic solutions to accommodate track inaccuracy information in track databases. Navigation and measurement aiding processes are defined by a stochastic mode relative to a moving rail frame defined so that it is aligned with the heading of the compensated track database at the current along track-position. Filtering generates long and short wavelength track alignment disturbances commensurate with track grade to compensate for track database errors; a stochastic error model is defined as the difference between the deterministic implementation and the actual stochastic processes Bayesian estimation of the error variables is implemented via a digital Kalman filter with the navigation, database, and measurement errors removed by subtracting the filter estimates.

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