轴对称型飞行器气动参数辨识研究

本文针对轴对称海防型号飞行器的特点，尝试在弹道坐标系内建立了气动参数估计的数学模型，较之传统的体系内建立的数学模型，其非线性程度小，方程间的耦合程度大大减弱，考虑到轴对称气动特点，使特估参数大大减少，有效地提高了估计效率。文中同时对气动参数可性做了一定的分析。某民导弹的模拟辨识结果表明所建立的数学模型及估计过程正确，有效。最后采用某次飞行打靶的实测数据进行了气动参数的辨识，弹道重构的结果令人满意。

AERODYNAMIC COEFFICIENTS IDENTIFICATION FOR A AXIS-SYMMETRIC FLIGHT VEHICLE

Considering the characteristics of axis-symmetric flight vehicle,a mathmatical model used for aerodynamic coefficients identification is set up in trajectory-axis frame. The model has small nonlinearity and weak coupling among state equations by comparing with traditional model that has been set up in body-axis frame,and the number of parameters being estimated is reduced greatly. The efficiency of Extend Kalman filter is improved greatly. In the meanwhile,this paper gives a detailed analysis to the parameters identifiability. The results of simulated identification of an axis-symmetric missile shows that the mathematical model and estimation method are correct and valid. Finally the above procedure has been applied to measured flight test data and the results of trajectory reconstruction is satisfied. The all procedure is very suitable for axis-symmetric flight vehicle.