1.问题的提出: 随着导弹姿控系统设计难度的不断增长,线性校正方法暴露了其最大缺点:线性网络的幅值和相位特性存在着硬性关系.欲得到相位超前,同时会引起中高频幅值放大,影响弹性振动稳定性和系统抗干扰能力;欲得到幅值衰减,相位滞后又太大.因此,不得不探求非线性校正方法. 1. PROBLEM PROBLEMS: With the increasing difficulty of designing missile attitude control systems, the linear correction method reveals its biggest drawback: there is a rigid relationship between the amplitude and phase characteristics of the linear network. To obtain phase advance, it will also cause high-frequency Amplitude amplification, the impact of elastic vibration stability and anti-interference ability of the system; To get the amplitude attenuation, the phase lag is too large. So, have to explore non-linear correction method.