Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1986-10-23
1988-09-20
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33361, G01C 1728
Patent
active
047715472
ABSTRACT:
A correction apparatus for an azimuth calculation system which includes an azimuth sensor mounted on a moving body for producing two mutually perpendicular magnetic field components relative to the earth's magnetism acting thereon, and wherein the azimuth sensor is moved in a full circle so that an azimuth circle is formed by the two magnetic field components. The correction apparatus is arranged to store a plurality of interspaced X-axis lines in parallel with the abscissa of a right-angled coordinate and a plurality of interspaced Y-axis lines in parallel with the ordinate of the coordinate, to determine maximum and minimum values respectively defined by intersections of the azimuth circle with the X-axis lines and maximum and minimum values respectively defined by intersections of the azimuth circle with the Y-axis lines, to determine first and second center values of the azimuth circle based on each mean value of the first-named maximum and minimum values and the second-named maximum and minimum values, to correct the magnetic field components respectively in accordance with the first and second center values, and to calculate a direction of the moving body on a basis of the corrected magnetic field components.
REFERENCES:
patent: 4413424 (1983-11-01), Sasaki et al.
patent: 4416067 (1983-11-01), Scherer et al.
patent: 4480226 (1984-10-01), Kuno et al.
patent: 4555761 (1985-11-01), Matsumoto et al.
Akutsu Kazushi
Ichikawa Hitoshi
Martin, Jr. William D.
Nippondenso Co. Ltd.
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