| 摘要 |
A system for use in guiding a vehicle on a roadway along an elongated guide member emitting a magnetic field includes an upper sensor and a lower sensor connected to the vehicle. The lower sensor detects a magnetic field emitted by the elongated guide member and an ambient magnetic field. The upper sensor detects only the ambient magnetic field. The signals produced by the detectors are processed to subtract the signal from the upper sensor of that of the lower sensor to produce a steering signal for transmission to an automatic steering system on the vehicle.
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