Patent ID: 6289269
Filing Date: 2001-09-11
Classification: B62D,G05D

Abstract:
Apparatus for use in guiding a vehicle on a roadway along an elongated guide member emitting a magnetic field, said apparatus comprising, in combination:a first sensor attached to the vehicle for detecting both the magnetic field emitted by the elongated guide member and an ambient magnetic field not emitted by the elongated guide member, said first sensor producing a primary signal representative of the detected magnetic field emitted by the elongated guide member and the ambient magnetic field;a second sensor attached to the vehicle for detecting the ambient magnetic field but not a substantial portion of the magnetic field emitted by the elongated guide member, said second sensor producing a reference signal representative of the ambient magnetic field; anda signal processor for processing the primary and reference signals to subtract the reference signal from the primary signal and produce a steering signal for transmission to an automatic steering system on said vehicle.