COMPASS CALIBRATION SYSTEM AND METHOD
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Accused Products
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.
74 Citations
42 Claims
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1. -21. (canceled)
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22. A processor for use in a system comprising a compass and a receiver configured to communicate with a positioning system, the processor being configured to communicate with the compass and the receiver, the processor comprising:
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a first input for receiving a first signal associated with the compass; a second input for receiving a second signal associated with the positioning system; wherein the processor is configured to calculate a compass error factor based on a deviation analysis, and wherein the deviation analysis is based on the first signal and the second signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. An in-vehicle compass system, including a compass, a transceiver configured to communicate with a positioning system, and a processor configured to communicate with the compass and the transceiver, the in-vehicle compass system comprising:
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a control circuit configured to communicate with the processor; a memory device configured to store an in-vehicle compass system configuration, at least one magnetic field model compass error factor and configured to communicate with the control circuit; wherein the in-vehicle compass system configuration includes a magnetic field model utilization parameters and a deviation analysis utilization parameters; wherein the control circuit utilizes a magnetic field model compass error factor based on the magnetic field model utilization parameters being triggered; and wherein the control circuit utilizes a compass error factor from a deviation analysis based on the deviation analysis utilization parameters being triggered. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A method for calibrating an electronic compass system, the method comprising:
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calculating a location based on a positioning system location signal; calculating a deviation analysis based on the positioning system location signal and a compass signal; calculating a compass error factor based on the deviation analysis; and utilizing the compass error factor to adjust the electronic compass system. - View Dependent Claims (38, 39, 40, 41)
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42. A method for calibrating an electronic compass system, the method comprising:
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determining a longitude position and a latitude position; determining a magnetic field strength utilizing a magnetic field model based on the longitude position and the latitude position; determining a vehicle heading based on a positioning signal; and determining a magnetic heading correction factor based on the magnetic field strength and the vehicle heading.
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Specification