Calculation method for air data based on information from inertial navigation system and wind field

Aiming at air data measuring under high altitude, high mobility and high velocity for aerospace vehicles, a calculation method for air data based on information from inertial navigation system and wind field is proposed. This algorithm provides indirect measurements of air data without requiring extra hardware. On the base of the turbulence model (Dryden model), time domain model of turbulence is established from temporal spectrum. Exploiting the wind speed from the weather forecast, the mathematic relationship between INS, wind field and air data (including true air speed, angle of sideslip, and angle of attack) is established. Real-time estimation of air data is achieved using EKF. The simulation results show that, this method not only has high precision, favorable stability and robustness, but also improves the measurement range and reliability of air data system, which can effectively be used to measure the angle of attack, the angle of sideslip and true airspeed within full flight envelope.