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US 10,295,559 B2Granted
Accelerometer calibration in a rotating member
AssigneeNXP USA, Inc.
InventorsChad S. Dawson, John Wertz
Life of this patent
Estimating the term…
Abstract
To calibrate an accelerometer, a rotating member is rotated over multiple periods, thereby causing the accelerometer attached to the rotating member to repeatedly turn over. A processor obtains acceleration measurements as the accelerometer turns and determines a set of local minima and maxima of the acceleration measurements. Based on these local minima and maxima, the processor determines a sensitivity of the accelerometer. The processor stores the sensitivity for use in adjusting subsequent accelerometer measurements, thus calibrating the accelerometer.
Claims10
A method comprising:
- flipping an accelerometer attached to a rotating member from a first position to a second position as the rotating member rotates through multiple rotation periods;
- receiving a first set of measurements from the accelerometer attached to the rotating member as the rotating member rotates through multiple rotation periods at the first position and the second position;
- calibrating the accelerometer based on the first set of measurements corresponding to the first position and the second position of the accelerometer, wherein calibrating the accelerometer comprises:
- determining a first difference between a first local maximum and a first local minimum of the first set of measurements;
- determining a second difference between a second local maximum and the first local minimum of the first set of measurements;
- determining a sensitivity value of the accelerometer based on an average of the first difference and the second difference;
- and
- adjusting a second set of measurements based on the sensitivity value;
- and
- localizing the rotating member based on the adjusted second set of measurements.
7 more elements
A method, comprising:
- rotating a member through a plurality of rotation periods, the member being attached to an accelerometer;
- flipping the accelerometer from at least a first position to a second position while rotating;
- determining, at the first position and the second position of the accelerometer, a first plurality of acceleration measurements over the plurality of rotation periods;
- calibrating the accelerometer based on the first plurality of acceleration measurements, wherein calibrating the accelerometer comprises:
- determining a first difference between a first local maximum and a first local minimum of the acceleration measurements;
- determining a second difference between a second local maximum and the first local minimum of the acceleration measurements;
- and
- adapting a second plurality of acceleration measurements based on an average of the first difference and the second difference;
- and
- localizing the member based on the calibrated accelerometer.
7 more elements
Dependencies are inferred from the claim text.