基于调制函数的导弹弹体模型辨识

Identification of Missile Body Models Based on Modulating Functions

针对动力系数法计算弹体传递函数受小扰动假设约束的问题,文中提出了一种新的基于Hartley调制函数和最小二乘的导弹弹体模型辨识方法,通过阶跃、方波等信号的输入响应辨识了某型反坦克导弹的滚转通道和俯仰通道传递函数模型,并在六自由度弹道仿真模型中得到验证。结果表明:该方法得到的弹体模型比通过动力系数计算得到的模型更为准确,且不受小扰动假设约束,可以广泛应用于轴对称弹体。

As models calculated by dynamic coefficients are constrained by small disturbance assumption, a new method of identifying missile body models is proposed. This method is based on Hartley modulating functions and Least Squares. According to the response for several kinds of signal, the transfer functions of an anti-tank missile are identified in roll and pitch channels and are later validated by 6-degree-of freedom trajectory simulation model. The results show that models obtained by the new method are more accurate than that calculated by dynamic coefficients, and are not constrained by small disturbance assumption. This method can be widely used in axial symmetric missiles.