Vehicle compass with automatic continuous calibration

Details Vehicle compass with automatic continuous calibration Vehicle compass with automatic continuous calibration

1987-05-27

1990-09-04

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33361, 364184, G01C 1730

Patent

active

049533053

ABSTRACT:
A vehicle compass includes a magnetic field sensor for mounting within a vehicle and providing two output channels of information representing orthogonal direction sensing of the earth's magnetic field within the vehicle. The sensor is coupled to an electrical circuit including a microprocessor for sampling the data from each of the two channels and providing a plurality of tests to determine if the rate of change of data is within a prescribed limit thereby indicating valid data is being received. Further, the data is tested to determine the maximum and minimum signal levels during movement of the vehicle through a completed 360.degree. path of travel and for calculating therefrom the compass compensation information used to provide a corrected heading display.

REFERENCES:
patent: 3807666 (1974-04-01), Devlin
patent: 4555761 (1985-11-01), Matsumoto et al.
patent: 4622754 (1986-11-01), Chujo et al.
patent: 4672565 (1987-06-01), Kuno et al.
patent: 4685053 (1987-08-01), Hattori

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