Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic particles were deemed non-trappable i
空间激光通信中捕获、瞄准和跟踪(Acquisition Pointing and Tracking,APT)系统采用复合轴结构,跟踪精度主要取决于精跟踪系统。为提高APT系统的稳健性和跟踪精度的角度,对APT精跟踪系统的控制算法进行了深入地研究,在系统的补偿设计中采用了稳健控制技术,建立了精跟踪系统的增广对象的数学模型,利用现代稳健控制理论中的γ综合法设计了稳健H∞控制器,使精跟踪系统带宽达到300 Hz以上,提高了粗精度带宽比。阶跃输入和等效正弦仿真表明,精跟踪系统具有很强的稳健性,跟踪精度优于0.8