Importance

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Abstract

A navigation technique for a vehicle employs an inertial reference system to derive a first position indication and a first velocity value. A first receiver processes signals of a global positioning system from which a second position indication and a second velocity value are derived. A second receiver processes signals from a plurality of distance measuring equipment stations at fixed positions on the earth and determines the distance between the vehicle and each of those stations. A third position indication is derived from those distances. A Kalman filter function is applied to the first, second and third position indications and to the first and second velocity values to compensate for uncertainty in the first position indication and in the first velocity value and thereby produce a vehicle position estimate and a vehicle velocity estimate.

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First Claim