Bias estimating method, posture estimating method, bias estimating device, and posture estimating device
First Claim
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1. A method for calibrating a multi-axis acceleration sensor using an estimation of a bias of the multi-axis acceleration sensor, the method comprising:
- placing the multi-axis acceleration sensor in a calibration posture having an unknown actual posture angle where one axis of the multi-axis acceleration sensor is parallel to the vertical direction;
calculating a virtual posture angle of the multi-axis acceleration sensor placed in the calibration posture, whereinthe virtual posture angle is an estimation of the actual posture angle and is calculated through the use of acceleration detection values of a plurality of axes of the multi-axis acceleration sensor measured by the multi-axis acceleration sensor by assuming a zero bias in the acceleration detection values, andthe calculated virtual posture angle is different than the actual posture angle;
estimating a bias value contained in the acceleration detection value of each axis of the plurality of axes using the acceleration detection value of the corresponding axis and the virtual posture angle; and
calibrating the multi-axis acceleration sensor using the estimated bias value.
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Abstract
A bias estimating method includes: calculating a virtual posture angle which is a posture angle with a bias which is assumed to be zero by the use of detection values of a plurality of axes in a calibration posture where one axis of a multi-axis acceleration sensor is parallel to the vertical direction; and estimating a bias value contained in the detection value of the axis using the detection value of the axis and the virtual posture angle.
4 Citations
15 Claims
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1. A method for calibrating a multi-axis acceleration sensor using an estimation of a bias of the multi-axis acceleration sensor, the method comprising:
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placing the multi-axis acceleration sensor in a calibration posture having an unknown actual posture angle where one axis of the multi-axis acceleration sensor is parallel to the vertical direction; calculating a virtual posture angle of the multi-axis acceleration sensor placed in the calibration posture, wherein the virtual posture angle is an estimation of the actual posture angle and is calculated through the use of acceleration detection values of a plurality of axes of the multi-axis acceleration sensor measured by the multi-axis acceleration sensor by assuming a zero bias in the acceleration detection values, and the calculated virtual posture angle is different than the actual posture angle; estimating a bias value contained in the acceleration detection value of each axis of the plurality of axes using the acceleration detection value of the corresponding axis and the virtual posture angle; and calibrating the multi-axis acceleration sensor using the estimated bias value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for calibrating a multi-axis acceleration sensor using an estimation of a bias of the multi-axis acceleration sensor, the device comprising:
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a virtual posture angle calculating unit that calculates a virtual posture angle of a multi-axis acceleration sensor placed in a calibration posture having an unknown actual posture angle where one axis of the multi-axis acceleration sensor is parallel to the vertical direction, wherein the virtual posture angle is an estimation of the actual posture angle and is calculated by the use of acceleration detection values of a plurality of axes of the multi-axis acceleration sensor measured by the multi-axis acceleration sensor by assuming a zero bias in the acceleration detection values, and the calculated virtual posture angle is different than the actual posture angle; a bias estimating unit that estimates a bias value contained in the acceleration detection value of each axis of the plurality of axes using the acceleration detection value of the axis and the virtual posture angle; and a calibration unit that calibrates the multi-axis acceleration sensor using the estimated bias value. - View Dependent Claims (8)
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9. A device for calibrating a multi-axis acceleration sensor having a plurality of axes using an estimation of a bias of the multi-axis acceleration sensor, the device comprising:
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an instruction unit that instructs a user to place the device in a calibration posture where the actual posture angle is unknown; a calculating unit that calculates a virtual posture angle of a multi-axis acceleration sensor at the calibration posture using a detection value measured by a multi-axis acceleration sensor, wherein the calculated virtual posture angle is different than the actual posture angle; a bias estimating unit that estimates a bias value contained in the detection value using the virtual posture angle and the detection value; and a calibration unit that calibrates the multi-axis acceleration sensor using the estimated bias value. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification