Cancellation of background field using magnetic compass sensor for magnetometer based autonomous vehicle

In this paper, a cancellation method of background field using a magnetic compass sensor is proposed for a magnetometer based autonomous vehicle. The magnetic fields from sample magnets are first measured to determine the characteristics of the field patterns as the basis for detection and position identification. The properties of the earth's magnetic field on the recognition of magnet field patterns are discussed. Also presented in the paper is a discussion of a position sensing system with a cancellation of the earth's field. The position sensing technique was implemented in the guidance of autonomous vehicle. By the experiment, it is verified that the proposed cancellation method of background field can be useful for an autonomous vehicle.