Dynamic attitude measurement method and apparatus
First Claim
1. A method for correcting a predicted attitude of an accelerating object, the method comprising:
- receiving external aiding data;
calculating an inertial speed from the external aiding data;
adjusting a sensor correction factor in response to the inertial speed; and
,correcting the predicted attitude of the accelerating object in response to the adjusted sensor correction factor.
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Abstract
A method and system senses the attitude of an accelerating object by measuring acceleration with accelerometers in three orthogonal axes and measuring angular rate with angular rate sensors disposed about each such axis to compute attitude of the object accurately relative to a vertical axis. A processor updates a quaternion representation of attitude based upon the angular rate of the object, and a corrective rate signal is determined from level frame acceleration as a reference for a Kalman filter in calculating the attitude of the object. When velocity or airspeed is available from an external source, an aiding algorithm is employed to provide accurate attitude representations throughout all flight regimes.
84 Citations
13 Claims
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1. A method for correcting a predicted attitude of an accelerating object, the method comprising:
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receiving external aiding data; calculating an inertial speed from the external aiding data; adjusting a sensor correction factor in response to the inertial speed; and
,correcting the predicted attitude of the accelerating object in response to the adjusted sensor correction factor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for correcting a predicted attitude of an accelerating object, comprising:
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a processor for receiving external aiding data and computing an inertial velocity; and
,an adaptive filter, coupled to the processor, comprising a sensor correction factor adjusted in response to the inertial velocity, for predicting the attitude of the accelerating object. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification