摘要
在卫星姿控任务中,经常需要估计卫星姿态角速度。常用方法有导数法和估计法。该文提出了一种新的高增益角速度观测器。基于Lyapunov分析,给出了它在有观测噪声下的精度上界。分析了其精度和增益的关系,确立了增益选择的原则。相比其他方法,该观测器的稳定性和精度有理论保证,计算简便,无需参数调整。仿真表明,观测精度优于0.003(°)/s,将其结果用于反馈,能够恢复状态反馈的系统轨迹和性能。该高增益角速度观测器将在卫星姿控任务中得到广泛应用。
Accurate estimates of the angular velocity are often required for satellite attitude control. However, traditional derivative and estimation methods are not accurate enough for accurate satellite control. This paper describes a new high-gain observer for measuring angular velocities. Lyapunov analysis was used to define an upper bound for its estimation error with observation noise. The gain selection was then related to the accuracy estimate so that the stability and accuracy of the observer would be guaranteed. The method has no tunable parameters and the computations are simple. Simulation results show that the observation accuracy is better than 0.003(°)/s. The trajectory and performance of the state feedback control with this method is recovered so the high-gain observer can be widely used in satellite attitude control problems.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第8期1017-1020,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目(TG2000077606)
