Acceleration compensated inclinometer
First Claim
Patent Images
1. An inclinometer, comprising:
- a speedometer to determine a forward speed;
an accelerometer to measure a forward acceleration;
a yaw rate sensor to measure a yaw angle rate;
a yaw distance compensator configured to use said yaw angle rate with a linear position offset of said accelerometer respective to a turn radius line to determine a position offset error; and
an incline angle calculator configured to use said acceleration, said yaw angle rate, said position offset error and said speed to calculate an incline angle.
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Abstract
An inclinometer using a speedometer and a forward-looking accelerometer for measuring inclination angle.
45 Citations
28 Claims
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1. An inclinometer, comprising:
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a speedometer to determine a forward speed; an accelerometer to measure a forward acceleration; a yaw rate sensor to measure a yaw angle rate; a yaw distance compensator configured to use said yaw angle rate with a linear position offset of said accelerometer respective to a turn radius line to determine a position offset error; and an incline angle calculator configured to use said acceleration, said yaw angle rate, said position offset error and said speed to calculate an incline angle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An inclinometer, comprising:
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a speedometer to determine a forward speed; an accelerometer to measure a forward acceleration; a yaw rate sensor to measure a yaw angle rate; a yaw alignment compensator configured to use said yaw angle rate with said speed and a yaw alignment angle of said yaw rate sensor respective to a forward direction to determine a yaw alignment error; and an incline angle calculator configured to use said acceleration, said yaw alignment error and said speed to calculate an incline angle. - View Dependent Claims (8)
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9. An inclinometer, comprising:
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a speedometer to determine a forward speed; an accelerometer to measure a forward acceleration; a restart bias detector to estimate an accelerometer bias at a restart of motion after a dormant time period, said estimate based on a last incline angle before said dormant time period; and an incline angle calculator configured to use said acceleration, said accelerometer bias and said speed to calculate a new said incline angle.
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10. An inclinometer, comprising:
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a speedometer to determine a forward speed; an accelerometer to measure a forward acceleration; a DR altitude calculator to use said speed and said acceleration to calculate an altitude change; a Kalman filter configured to filter said altitude change with at least one external altitude fix to estimate an accelerometer bias; and an incline angle calculator configured to use said acceleration, said accelerometer bias and said speed to calculate an incline angle. - View Dependent Claims (11, 12)
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13. An inclinometer, comprising:
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a speedometer to determine a forward speed; an accelerometer to measure a forward acceleration; an incline angle calculator to calculate incline angle based on said measured acceleration and rate of change of said speed; a GNSS receiver to determine a GNSS-based position and a three dimensional GNSS-based heading including a GNSS-based incline angle; a yaw rate sensor to measure a yaw angle rate; and
wherein;the incline angle calculator is configured to use said yaw angle rate, said GNSS-based position, said speed rate and said measured acceleration to determine a dead reckoning incline angle with a better accuracy than said GNSS-based upward heading. - View Dependent Claims (14)
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15. A method for determining incline angle, comprising:
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determining a forward speed; measuring a forward acceleration; measuring a yaw angle rate; using said yaw angle rate with a linear position offset respective to a turn radius line for determining a position offset error; and using said acceleration, said position offset error and said speed for calculating an incline angle. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for determining incline angle, comprising:
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determining a forward speed; measuring a forward acceleration; measuring a yaw angle rate; using said yaw angle rate with said speed and a yaw alignment angle of said yaw rate sensor respective to a forward direction; and using said acceleration, said yaw alignment error and said speed for calculating an incline angle. - View Dependent Claims (22)
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23. A method for determining incline angle, comprising:
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determining a forward speed; measuring a forward acceleration; at a restart of motion after a dormant time period, estimating an accelerometer bias based on a last said incline angle before said dormant time period; and using said acceleration, said accelerometer bias and said speed for calculating an incline angle.
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24. A method for determining incline angle, comprising:
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determining a forward speed; measuring a forward acceleration; using said speed and said acceleration for calculating an altitude change; and Kalman filtering said altitude change with an external altitude fix to estimate said accelerometer bias; and using said acceleration, said accelerometer bias and said speed for calculating an incline angle. - View Dependent Claims (25, 26)
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27. A method for determining incline angle, comprising:
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determining a forward speed; measuring a forward acceleration; calculating an incline angle based on said measured acceleration and a rate of change of said speed; determining a GNSS-based position and a three dimensional GNSS-based heading including a GNSS-based incline angle; measuring a yaw angle rate; and
wherein;calculating said incline angle includes using said yaw angle rate, said GNSS-based position, said speed rate and said measured acceleration for providing a dead reckoning incline angle having a better accuracy than said GNSS-based incline angle. - View Dependent Claims (28)
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Specification