linear time invariant system meaning in Chinese

常参数线性系统
线性时不变系统

In this dissertation , a kind of linear time invariant systems with unmodeled dynamics and nonlinear uncertainties are considered by using backstepping approach and variable structure control algorithm . also another kind of linear time varying systems are studied based on the same method
本文主要利用backstepping方法与变结构控制方法，研究了有未建模动态及不确定非线性项的线性时不变系统，以及输入通道带有干扰的线性时变系统的控制器设计问题
The current control approaches are based on frequency domain methods such as pid control which assumes linear time invariant system dynamics . the advantages of these approaches are simplicity and ease of stability and robustness analysis . however , the decrease in performanc e and poor efficiency translates to additional payload and cannot meet the demand of current spacecraft control
当前飞行器主要的控制方法是基于近似时不变线性系统的频域分析法(如pid控制) ，这种方法的优点是简单且易于稳定性和鲁棒性分析，但它所达到的低性能和低效率却转化成了飞行器控制过程的附加载荷，还远不够满足当前飞行器控制的要求。