自抗扰技术在卫星姿态模拟系统中的应用

建立了高精度卫星姿态模拟系统用于光通信地面仿真试验,针对卫星轨迹特点,设计了一种改进的自抗扰控制算法。介绍了自抗扰控制技术的特点和控制原理,提出改进的伺服算法,为自抗扰算法引入了选择性积分项。针对系统±10″动态误差要求,设计了多阈值非线性函数,并添加状态判断模块实时更改非线性函数参数。同时,给出了算法主要参数的整定原则。然后,基于控制器开放伺服功能,给出了自抗扰控制的实现方法和计算流程。实验结果表明:系统具有良好的连续加减速能力,跟踪斜坡信号的动态误差为±6″;经对比,在跟踪卫星姿态轨迹时,自抗扰控制的抗干扰能力优于PID控制,跟随误差达到±7″,满足高精度姿态仿真要求。

Application of active disturbances rejection control technique in satellite attitude simulation system

Established the high-precision satellite attitude simulation system for ground-based optical communication experiment. For the features satellite trajectory, design an improved auto-disturbance-rejection control algorithm. First, introduced the characteristics and principle of auto disturbance rejection control technology. Then, proposed the improved servo algorithm, added selective integration item for ADRC algorithm. To satisfy ± 10" dynamic error requirements of system, designed multi threshold non-linear function, and then added state determine module to change non-linear function parameters in real time. At the same time, given the setting principle of the algorithm parameters. Then, based on the open servo functions of controller, the realization of the method and process was design for improved ADRC algorithm. The experimental results showed that? the dynamics following error of tracking ramp signal was ± 6 ", the system had a good capacity for acceleration and deceleration. By contrast, in the satellite attitude trajectory tracking, the auto-disturbance-rejection control of anti-interference ability is superior to PID, and the following error was ± 7 ". Auto disturbance rejection control algorithm met the requirements of high-precision attitude simulation and also had stability and strong anti-interference ability.