两维转镜的等效动态控制误差模型辨识

两维转镜的动态控制误差是影响激光制导武器对抗闭环半实物仿真试验精度的重要误差源，建立准确的控制误差模型是系统精度分析的基础。对于转镜的动态控制误差分析建模问题，常采用经典的频域设计法建立控制系统的传递函数来分析其控制误差，建模过程复杂且难以建立准确的模型，提出了一种过程辨识的方法，分析了辨识原理、辨识输入信号设计、模型阶次及模型参数的辨识方法等，在使用行列式比定阶法确定模型阶次的基础上，采用递推最小二乘法建立了转镜的等效动态控制误差模型。然后，根据转镜控制系统指标设计等效正弦信号对该模型进行了验证，结果表明:动态控制误差模型估计输出与实际仿真输出基本相同，估计误差均值为0，最大值仅为13，说明了建模的准确性，同时也为激光制导武器对抗闭环半实物仿真试验系统中其他仿真设备的建模提供了方法支持。

Identification of equivalent dynamic control error model for two-dimensional mirror

Dynamic control error of precise two-dimensional mirror was the important influencing error factor on simulation precision of the laser guided weapon countermeasure simulation system, the accurate error model was the foundation for precision analysis of the simulation system. At present classical frequency method was adopted to analyze the control error by setting up the transfer function of the servo system, the modeling process was complex and accurate model was not easy to build. Then the paper gave the principle of the identification method, the design approach of input LFM signal, the ranks and parameters of the equivalent control error model which was built by using RWLS method. The proposed model was verified by simulative test by inputting the sine signal according to the performance index of the mirror. The result showed that the estimate output was consistent with the simulation output: the estimate average error and maximum error were 0and 13 respectively, which explained the accuracy of the control error model and provided the support for modeling the dynamical control error of other simulation equipment in the simulation system.