VEHICLE GUIDANCE SYSTEMS

摘要

A vehicle guidance system in which a vehicle may be guided to follow accurately any one of a number of paths laterally offset different predetermined distances from a single guide wire using a magnetic sensing head arrangement which does not have to operate from a null position above the guide wire. Preferably the vehicle is guided along a path determined by a selected value of the ratio between the effective gradient and the vertical component of the electromagnetic field and the strength of the vertical component of the electromagnetic field at the vehicle, the selection of the desired path offset a predetermined distance from the guide member being made by the use of a variable electrical device such as a potentiometer.