Importance

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Abstract

A method for determining the direction of the earth field, the north direction and the travelling direction of a vehicle by way of a magnetometer mounted in the vehicle is based on dynamic compensation or updating of interfering field changes. For this purpose, a resultant vector (v.sub.K) is formed from the magnetic field vector (V.sub.M) effective at the magnetometer, the previous hard-magnetic interfering field vector (H.sub.H) and the nominal vector (V.sub.P) determined from the circle diagram (O) of the magnetic field, as interfering field change in accordance with the equation v.sub.K =V.sub.M -v.sub.B -H.sub.H and this vector is weighted with a factor (k<1). The weighted resultant vector (K.times.v.sub.K) is then added to the previous interfering field vector (H.sub.H). Using the new hard-magnetic interfering field vector (H.sub.H'), thus determined, the direction of the earth field is then calculated in known manner and evaluated for navigation.

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First Claim