In view of the attitude calculation of a small quadrotor
the inertial device is easily affected by the acceleration of non-gravity during taking-off and landing. A new attitude calculation algorithm of quadrotor with adaptive error quaternion unscented Kalman filter is proposed. Following the traditional unscented Kalman filter algorithm
this algorithm combines the gyroscope drift error model and chooses the error quaternion to construct the state equation of the unscented Kalman filter. The measurement equation of the unscented Kalman filter is constructed by using the output signal of accelerometer and magnetometer. Adjusting the noise covariance matrix adaptively
the influence of non-gravity acceleration on attitude calculation is reduced. Experiment shows that when the quadrotor has non gravity acceleration
the algorithm can effectively reduce the influence of non-gravity acceleration shadow on the attitude calculation.
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