Compass

Details Compass Compass

1983-10-12

1985-10-15

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33361, 33363R, G01C 1738

Patent

active

045465509

ABSTRACT:
An electronic compass for vehicles comprising at least two magnetic sensors arranged in use to be respectively responsive to orthogonal horizontal components of a magnetic field which includes the earth's magnetic field and a spurious magnetic field which is associated with the vehicle, for producing electrical signals corresponding to said components, data storage means arranged to store signals derived from the sensors as the vehicle is rotated in the horizontal plane during a compass setting cycle, and signal processor means responsive to electrical signals produced by the sensors after the setting cycle has been completed and to the signals stored during the setting cycle, for providing output signals indicative of the bearing appertaining to the heading of the vehicle in which the effects of the spurious magnetic field are compensated for.

REFERENCES:
patent: 3991361 (1976-11-01), Mattern et al.
patent: 4143467 (1979-03-01), Erspamer et al.
patent: 4179741 (1979-12-01), Rossani
patent: 4300390 (1981-11-01), Shimizu
patent: 4412387 (1983-11-01), Lenko
patent: 4413424 (1983-11-01), Sasaki et al.
patent: 4414753 (1983-11-01), Moulin et al.
patent: 4429469 (1984-02-01), Tsushima et al.

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