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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。
In satellite attitude control missions, it is often necessary to estimate satellite attitude angular velocities. Common methods are derivative method and estimation method. This paper presents a new high-gain angular velocity observer. Based on Lyapunov analysis, the upper bound of its accuracy under observed noises is given. The relationship between accuracy and gain is analyzed, and the principle of gain selection is established. Compared with other methods, the stability and accuracy of the observer are theoretically guaranteed, the calculation is simple and no parameter adjustment is needed. The simulation shows that the observation accuracy is better than 0.003 (°) / s, and the result is used for feedback, which can restore the system trajectory and performance of state feedback. The high gain angular velocity observer will be widely used in satellite attitude control missions.