COMPASS CALIBRATION SYSTEM AND METHOD
First Claim
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1. A device for use with a compass, the device comprising:
- an input for receiving signals from the compass;
a memory device; and
a processing circuit configured to determine magnetic compass headings using the signals received from the compass;
wherein the processing circuit is further configured to determine true headings;
wherein the processing circuit is configured to calculate a deviation for each of a plurality of headings, each deviation comprising a difference between a magnetic compass heading and a true heading;
wherein the processing circuit is configured to use the deviations for each of the plurality of headings to calculate a plurality of compass deviation coefficients representative of different types of noise sources; and
wherein the processing circuit is configured to store the deviation coefficients in memory and to at least one of calibrate the compass and adjust an output from the compass using the compass deviation coefficients.
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Abstract
An in-vehicle compass system and method that is calibrated based on a magnetic field model and/or a deviation analysis based on a location signal received from a positioning system.
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Citations
19 Claims
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1. A device for use with a compass, the device comprising:
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an input for receiving signals from the compass; a memory device; and a processing circuit configured to determine magnetic compass headings using the signals received from the compass; wherein the processing circuit is further configured to determine true headings; wherein the processing circuit is configured to calculate a deviation for each of a plurality of headings, each deviation comprising a difference between a magnetic compass heading and a true heading; wherein the processing circuit is configured to use the deviations for each of the plurality of headings to calculate a plurality of compass deviation coefficients representative of different types of noise sources; and wherein the processing circuit is configured to store the deviation coefficients in memory and to at least one of calibrate the compass and adjust an output from the compass using the compass deviation coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for calibrating a compass using a processing circuit, the method comprising:
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receiving signals from the compass at the processing circuit; using the processing circuit to determine magnetic compass headings based on the signals received from the compass; determining true headings using the processing circuit; using the processing circuit to calculate a deviation for each of a plurality of headings, each deviation comprising a difference between a magnetic compass heading and a true heading; using the processing circuit to calculate a plurality of compass deviation coefficients based on the deviations for each of the plurality of headings, the plurality of compass deviation coefficients representative of different types of noise sources; and using the processing circuit to at least one of calibrate the compass, adjust an output from the compass, or calibrate the compass and adjust the output from the compass using the compass deviation coefficients. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification