Method and apparatus for using magnetic field
First Claim
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1. A method of using a magnetic field, comprising:
- measuring and storing magnetic field data indicating magnitudes of a magnetic field in different directions at each time by rotating sensors in different directions over a space, said magnetic field data forming one or more magnetic field trajectories;
checking whether a disturbance of the magnetic field exists, using an amplitude and an offset of at least one of the magnetic field trajectories;
determining a candidate location of a compass, moving the compass to the candidate location, measuring and storing the magnetic field data indicating the magnitudes of the magnetic field and checking whether the disturbance of the magnetic field exists, until it is determined that the disturbance of the magnetic field does not exist; and
when it is determined that the disturbance of the magnetic field does not exist, calculating the compass by using the stored magnetic field data.
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Abstract
Provided a method and apparatus for using a magnetic field. The method includes: measuring and storing magnetic field data indicating magnitudes of a magnetic field in different directions at each time by rotating sensors over a space; and checking whether a disturbance of the magnetic field exists, using curve fitting parameters such as amplitude and offset of at least one of magnetic field trajectories formed by the stored magnetic field data.
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Citations
21 Claims
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1. A method of using a magnetic field, comprising:
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measuring and storing magnetic field data indicating magnitudes of a magnetic field in different directions at each time by rotating sensors in different directions over a space, said magnetic field data forming one or more magnetic field trajectories; checking whether a disturbance of the magnetic field exists, using an amplitude and an offset of at least one of the magnetic field trajectories; determining a candidate location of a compass, moving the compass to the candidate location, measuring and storing the magnetic field data indicating the magnitudes of the magnetic field and checking whether the disturbance of the magnetic field exists, until it is determined that the disturbance of the magnetic field does not exist; and when it is determined that the disturbance of the magnetic field does not exist, calculating the compass by using the stored magnetic field data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for using a magnetic field, comprising:
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a magnetic field measurer which measures magnetic field data indicating magnitudes of a magnetic field at each time while rotating sensors in different directions over a space, said magnetic field data forming one or more magnetic field trajectories; a storage which stores the measured magnetic field data; a magnetic field disturbance checker which checks whether a disturbance of the magnetic field exists using an amplitude and an offset of at least one of magnetic field trajectories; a movement controller which determines a candidate location of a compass, moves the compass to the candidate location, measures and stores the magnetic field data indicating the magnitudes of the magnetic field and checks whether the disturbance of the magnetic field exists, until it is determined that the disturbance of the magnetic field does not exist; and a compass calibrator which calculates the compass by using the stored magnetic field data, when it is determined that the disturbance of the magnetic field does not exist. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification