System and method for compensating for magnetic disturbance of a compass by a moveable vehicle accessory
First Claim
1. A vehicle compass system for compensating for magnetic disturbances caused by a moveable vehicle accessory, the vehicle compass system comprising:
- a magnetic field sensor configured to determine an orientation of the magnetic field sensor with respect to the Earth'"'"'s magnetic field and to generate magnetic field data, the magnetic field sensor positioned at a distance from the moveable vehicle accessory; and
a control circuit coupled to the moveable vehicle accessory and the magnetic field sensor, the control circuit configured to receive a position signal from the moveable vehicle accessory indicating whether the moveable vehicle accessory is changing position, to receive magnetic field data from the magnetic field sensor, to compare first magnetic field data generated prior to the change in position of the moveable vehicle accessory to second magnetic field data generated after the change in position of the moveable vehicle accessory and to generate a correction value based on the comparison of the first magnetic field data and the second magnetic field data;
wherein the correction value is used to correct for the magnetic disturbance caused by the moveable vehicle accessory.
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Accused Products
Abstract
A vehicle compass system for compensating for magnetic disturbances caused by a moveable vehicle accessory includes a magnetic field sensor and a control circuit coupled to the moveable vehicle accessory and the magnetic field sensor. The magnetic field sensor is positioned at a distance from the moveable vehicle accessory and is configured to determine an orientation of the magnetic field sensor with respect to the Earth'"'"'s magnetic field and to generate magnetic field data. The control circuit is configured to receive a position signal from the moveable vehicle accessory indicating whether the moveable vehicle accessory is changing position, to receive magnetic field data from the magnetic field sensor, to compare first magnetic field data generated prior to the change in position of the moveable vehicle accessory to second magnetic field data generated after the change in position of the moveable vehicle accessory and to generate a correction value based on the comparison of the first magnetic field data and the second magnetic field data. The correction value is used to correct for the magnetic disturbance caused by the moveable vehicle accessory.
25 Citations
24 Claims
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1. A vehicle compass system for compensating for magnetic disturbances caused by a moveable vehicle accessory, the vehicle compass system comprising:
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a magnetic field sensor configured to determine an orientation of the magnetic field sensor with respect to the Earth'"'"'s magnetic field and to generate magnetic field data, the magnetic field sensor positioned at a distance from the moveable vehicle accessory; and a control circuit coupled to the moveable vehicle accessory and the magnetic field sensor, the control circuit configured to receive a position signal from the moveable vehicle accessory indicating whether the moveable vehicle accessory is changing position, to receive magnetic field data from the magnetic field sensor, to compare first magnetic field data generated prior to the change in position of the moveable vehicle accessory to second magnetic field data generated after the change in position of the moveable vehicle accessory and to generate a correction value based on the comparison of the first magnetic field data and the second magnetic field data; wherein the correction value is used to correct for the magnetic disturbance caused by the moveable vehicle accessory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for compensating for magnetic disturbances of a compass caused by a moveable vehicle accessory positioned a distance from a magnetic field sensor of the compass, the method comprising:
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determining if the moveable vehicle accessory is changing position; determining first magnetic field data prior to the change in position of the moveable vehicle accessory; determining second magnetic field data after the change in position of the moveable vehicle accessory; comparing the first magnetic field data and the second magnetic field data; generating a correction value based on the comparison of the first magnetic field data and the second magnetic field data; and updating at least one calibration value of the compass based on the correction value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for compensating for magnetic disturbances of a compass caused by a moveable vehicle accessory positioned a distance from a magnetic field sensor of the compass, the method comprising:
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determining if the moveable vehicle accessory is changing position; determining first magnetic field data prior to the change in position of the moveable vehicle accessory; determining second magnetic field data after the change in position of the moveable vehicle accessory; comparing the first magnetic field data and the second magnetic field data; generating a correction value based on the comparison of the first magnetic field data and the second magnetic field data; and correcting third magnetic field data determined after the change in position of the moveable vehicle accessory based on the correction value.
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21. A method for compensating for magnetic disturbances of a compass caused by a moveable vehicle accessory, the method comprising:
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receiving magnetic field data from a magnetic field sensor positioned a distance from the moveable vehicle accessory; recording the magnetic field data from the magnetic field sensor; receiving a first position signal indicating the moveable vehicle accessory has begun changing position; halting storage of the magnetic field data from the magnetic field sensor based on the first position signal; receiving a second position signal indicating the moveable vehicle accessory has ceased changing position; recommencing storing the magnetic field data from the magnetic field sensor based on the second position signal; and determining a correction value based on the magnetic field data stored before receipt of the first position signal and the magnetic field data stored after receipt of the second position signal. - View Dependent Claims (22, 23, 24)
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Specification