Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1983-10-12
1985-09-10
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33363R, 33361, 33357, G01C 1738
Patent
active
045397600
ABSTRACT:
An electronic compass for vehicles comprising three magnetic sensors arranged in use to be respectively responsive to orthogonal 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, tilt sensor means responsive to vehicle tilt with respect to the horizontal plane, data processor and storage means arranged to store signals derived from the sensors as the vehicle is turned through 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 compensated signals related to the bearing appertaining to the heading of the vehicle in which the effects of the spurious magnetic field are compensated for and further processor means to which the compensated signals are applied and which is responsive to the tilt sensor means for modifying the compensated signals to produce output signals appertaining to vehicle heading in which the effects of tilt 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.
Foster Michael R.
Marchent Brian G.
Little Willis
Plessey Overseas Ltd.
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