Estimation Method for Angle-of-Attack and Sideslip Angle Based on Information Fusion at High Angle of Attack

The angle of attack and sideslip angle are important parameters of flight control system and navigation system.Considering that the angle of attack and the sideslip angle cannot be measured accurately when high-performance aircraft was at high angle of attack,a flight dynamics model was introduced in this paper.An Extended Kalman Filter(EKF) was constructed by taking the attitude,attitude angular rate,flow angle and velocity as state vectors,the attitude,attitude angular rate and acceleration provided by inertial navigation system(INS) as the observation vector.The filter combined the solving of flight dynamics model with the process of state estimation,and could obtain the accurate estimates of angle of attack and sideslip angle in real-time.Flight simulation data based on X-Plane was used to validate the feasibility and effectiveness of the estimation method.The simulation results show that the proposed method can not only has better accuracy,stability and robustness,but also improve the measurement range and reliability of air data system,which can measured angle of attack and sideslip angle at high angle of attack efficiently.