为获得快速反射镜系统位置环的数学模型,对快速反射镜系统输入线性扫频信号,根据输入线性扫频信号后系统的频域响应输出数据,在频域内采用有理式逼近的方法,对系统的位置环进行了非参数辨识研究,得到了快速反射镜系统位置环的数学模型.最后,经验证表明:将线性扫频信号分别输入辨识得到的模型和实际系统,在0~1000 rad/s的范围内,两者输出响应之间的误差小于3 dB,通过频域内有理式逼近的非参数辨识的方法得到的快速反射镜系统位置环数学模型是精确、有效的.%In order to obtain mathematical model of fast-steering mirror system position loop, linear sweep signal was input into the system firstly. Then, according to the system frequency domain response data after linear sweep signal input, use rational approximation method in frequency domain and carry out non-parameter identification method for system position loop for obtaining the mathematical model of position loop. Finally, through verification, input the identified model and real system, the error between the mathematical model's response data and the real system's response data was less than 3 db when frequency was in the range of 0-1000rad/s, and it turned out that the mathematical model which acquired by rational approximation non-parameter identification method was accurate and valid.
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