基于方程误差最小二乘的制导航空炸弹高空气动参数辨识

Aerodynamic Parameters Identification of Aerial Guided Bomb Based on Equation Error Least Square in High Altitude Environment

针对制导航空炸弹在高空稀薄大气环境下气动模型不准的问题,首先通过设计激励输入和飞行数据采集方案,获取可辨识性的飞行源数据,随后基于动力学方程将飞行源数据转换为气动系数的方程输出,最后通过最小化方程输出误差平方和,提出了一种基于线性回归的气动参数辨识方法。该方法具备结构简单,工程可行性强等特点。通过制导航空炸弹六自由度非线性模型的飞行仿真数据对该方法进行了验证,结果表明,该方法能够较为准确地辨识出相应的气动数据。

This paper aims at the problem of inaccurate aerodynamic model of aerial guided bomb in high-altitude rarefied at-mosphere.By designing the excitation input and flight data acquisition scheme,the identifiable flight source data are obtained.Then,based on the dynamic equation,the flight source data is converted into the equation output of aerodynamic coefficient.Finally,by minimizing the sum of squares of equation output errors,an aerodynamic parameter identification method based on linear regression is proposed.This method has the characteristics of simple structure,easy implementation and strong engineer-ing feasibility.The method is verified by the flight simulation data of a six degree of freedom nonlinear model of an aerial guided bomb.The results show that this method can accurately identify the corresponding aerodynamic data.