Magnetic sensor and accelerometer calibration techniques
First Claim
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1. A method for calibrating sensors of an apparatus, comprising the steps of:
- sampling at least four data points to obtain measured field values;
performing a mathematical operation to obtain offset values; and
correcting the measured field values with the offset values to calibrate the apparatus.
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Abstract
The invention relates, in general, to the field of magnetic sensors and accelerometers and the utilization of the same as magnetometers, magnetic compasses, range finders, navigational systems and other applications. More particularly, the invention relates to effective, simplified and highly accurate techniques for calibration of magnetic sensors and accelerometers.
15 Citations
24 Claims
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1. A method for calibrating sensors of an apparatus, comprising the steps of:
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sampling at least four data points to obtain measured field values; performing a mathematical operation to obtain offset values; and correcting the measured field values with the offset values to calibrate the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a plurality of sensors; and a controller coupled to the plurality sensors, wherein the plurality of sensors is capable of being calibrated by sampling at least four data points to obtain measured field values;
performing a mathematical operation to obtain offset values; and
correcting the measured field values with the offset values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An apparatus, comprising:
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a plurality of magnetic sensors to measure a magnetic field; a plurality of accelerometers to measure a gravitational field; and a controller coupled to the plurality of magnetic sensors and the plurality of accelerometers, wherein the plurality of magnetic sensors and the plurality of accelerometers are capable of being calibrated by sampling at least four data points from the plurality of magnetic sensors to obtain measured magnetic field values and sampling at least four data points from the plurality of accelerometers to obtain measured gravitational field values, wherein the controller is capable of performing a mathematical operation to obtain offset values corresponding to each of the measured magnetic field values and measured gravitational field values, and wherein the plurality of magnetic sensors and accelerometers are capable of being calibrated with the offset values for each of the measured magnetic field values and measured gravitational field values with the offset values. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification