add reference for the quaternion

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libing64 2016-03-22 20:18:37 +08:00
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@ -24,3 +24,4 @@ Extented Kalman filter for attitude estimation using imu and magnetic filed.
# reference: # reference:
https://pixhawk.org/_media/firmware/apps/attitude_estimator_ekf/ekf_excerptmasterthesis.pdf https://pixhawk.org/_media/firmware/apps/attitude_estimator_ekf/ekf_excerptmasterthesis.pdf
http://web.cs.iastate.edu/~cs577/handouts/quaternion.pdf