Magnetic course detector
First Claim
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1. A magnetic course detector for detecting the bearing of the course of a traveling body, comprising:
- a magnetic bearing sensor mounted in the traveling body and adapted to detect the direction of terrestial magnetism and generate output voltages Vx, Vy proportional to the magnetic field intensity;
an offset correcting means adapted to apply a bias to the said outputs of the magnetic bearing sensor so that the biased outputs V'"'"'x and V'"'"'y are V'"'"'x =Vx -O'"'"'x and V'"'"'y =Vy -O'"'"'x where O'"'"'x and O'"'"'y are respective offset correction components determined in a calibration mode for the magnetic course detector;
a sensitivity correcting means adapted to regulate the output levels of the magnetic bearing sensor so that the absolute values of the biased outputs V'"'"'x and V'"'"'y are equal in all directions; and
a sensor rotating means adapted for rotation of the magnetic bearing sensor such that the magnetic sensor coincides with the direction of the highest magnetic permeability of the traveling body.
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Abstract
Disclosed is a magnetic course detector capable of accurately detecting the bearing of the course of a traveling body independently of the position a magnetic bearing sensor is installed in the traveling body through rotatably mounting the magnetic bearing sensor and making corrections for the offset and sensitivity of its output.
45 Citations
10 Claims
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1. A magnetic course detector for detecting the bearing of the course of a traveling body, comprising:
- a magnetic bearing sensor mounted in the traveling body and adapted to detect the direction of terrestial magnetism and generate output voltages Vx, Vy proportional to the magnetic field intensity;
an offset correcting means adapted to apply a bias to the said outputs of the magnetic bearing sensor so that the biased outputs V'"'"'x and V'"'"'y are V'"'"'x =Vx -O'"'"'x and V'"'"'y =Vy -O'"'"'x where O'"'"'x and O'"'"'y are respective offset correction components determined in a calibration mode for the magnetic course detector;
a sensitivity correcting means adapted to regulate the output levels of the magnetic bearing sensor so that the absolute values of the biased outputs V'"'"'x and V'"'"'y are equal in all directions; and
a sensor rotating means adapted for rotation of the magnetic bearing sensor such that the magnetic sensor coincides with the direction of the highest magnetic permeability of the traveling body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a magnetic bearing sensor mounted in the traveling body and adapted to detect the direction of terrestial magnetism and generate output voltages Vx, Vy proportional to the magnetic field intensity;
Specification