Investigation On Methods Of Characteristic Parameters Identification Using Filght Data For Projectiles

To research the projectile flight experiment data which take the application of aerodynamic parameter calculation results.The application of this article in view of the flight characteristics generally projectile, on the basis of system identification theory and the projectile flight test data identification calculation the missile aerodynamic parameters.In the design process of a projectile, aerodynamic parameter determines the projectile flight ballistic trajectory and stability, in engineering practce.According to the flight test data identification method of aerodynamic parameter calculation is the most accurate, which is the most realistic projectile’s method for calculating the aerodynamic characteristics. As identification algorithm based on the maximum likelihood algorithm, depending on the play arrow flight test data to select four degrees of freedom rigid body trajectory equations and six degrees of freedom rigid body trajectory calculating aerodynamic parameter identification equations as state equation.First of all, the master’s thesis based on the generalized kalman filter theory, which is applied to the nonlinear dynamic system, and set up complete of aerodynamic parameter estimation formula of maximum likelihood identification algorithm is constructed; Secondly,based on the play arrow flight characteristics, missiles and space motion mathematical model is established, Applying maximum likelihood identification algorithm among them, the established missiles and mathematical model of aerodynamic parameter identification. Finally, the application of the model calculation missiles and aerodynamic parameter identification,.the accuracy of ballistic initial point.The results meet the requirements of engineering practice, and to think that this method is feasible.