Direction finder
First Claim
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1. An orientation finder for use on a moving vehicle, comprising:
- a terrestrial magnetism sensor mounted on said vehicle for detecting a pair of orthogonal components of a horizontal component of terrestrial magnetism to provide a pair of detection signals corresponding to said orthogonal components, respectively;
magnetization correction means for correcting said pair of detection signals with a pair of correction values necessary to cancel out an influence of a magnetic field produced by said vehicle itself and providing a pair of corrected detection signals; and
correction amending means for obtaining a perpendicular bisector of a line connecting two points corresponding to said pair of detection signals from said terrestrial magnetism sensor and said pair of corrected detection signals from said magnetization correction means on a rectangular coordinate system to amend said correction values on the basis of coordinates of a cross-point of said perpendicular bisector and a line extending perpendicularly from a point corresponding to said correction values to said perpendicular bisector.
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Abstract
A direction finder includes a terrestrial magnetism sensor, a magnetization correction means for correcting an output of the sensor with a magnetic field component produced by a vehicle itself on which the sensor is mounted and a correction amending means for amending a corrected output on the basis of coordinates of a cross point of a line extending perpendicularly from a coordinates corresponding to a correction amount produced by the magnetization correction means onto a perpendicular bisector of a line segment connecting two coordinates points obtained by the sensor at different time instances.
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Citations
5 Claims
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1. An orientation finder for use on a moving vehicle, comprising:
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a terrestrial magnetism sensor mounted on said vehicle for detecting a pair of orthogonal components of a horizontal component of terrestrial magnetism to provide a pair of detection signals corresponding to said orthogonal components, respectively; magnetization correction means for correcting said pair of detection signals with a pair of correction values necessary to cancel out an influence of a magnetic field produced by said vehicle itself and providing a pair of corrected detection signals; and correction amending means for obtaining a perpendicular bisector of a line connecting two points corresponding to said pair of detection signals from said terrestrial magnetism sensor and said pair of corrected detection signals from said magnetization correction means on a rectangular coordinate system to amend said correction values on the basis of coordinates of a cross-point of said perpendicular bisector and a line extending perpendicularly from a point corresponding to said correction values to said perpendicular bisector. - View Dependent Claims (2, 3)
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4. An orientation finder for use on a moving vehicle, comprising:
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a terrestrial magnetism sensor mounted on said vehicle for detecting a pair of orthogonal components of a horizontal component of terrestrial magnetism to provide a pair of electric signals corresponding to said orthogonal magnetic field components, respectively; initial correction means responsive to an output of said sensor for obtaining correction amounts; magnetization correction means for correcting said pair of electric signals with said correction amounts obtained by said initial correction means and providing a pair of corrected electric signals; correction amending means for obtaining a perpendicular bisector of a line connecting two points corresponding to said pair of detection signals from said terrestrial magnetism sensor and said pair of corrected signals from said magnetization correction means on a rectangular coordinate system to amend said correction amounts on the basis of coordinates of a cross point of said perpendicular bisector and a line extending perpendicularly from a point corresponding to said correction amounts to said perpendicular bisector; angle calculation means responsive to an output of said magnetization correction means for calculating an angle between a moving direction of said vehicle and a direction of said horizontal component of terrestrial magnetism; and display means for displaying said angle. - View Dependent Claims (5)
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Specification