为了模拟轨道运动对激光通信终端PAT系统性能的影响，研制了高精度一维转台。分析了GEO-LEO、LEO-LEO卫星相对运动角速度，据此提出转台角速度范围的需求；以控制器数字控制技术为基础，采用复合控制和高阶输入串联校正的方式实现超低速的平稳控制；分析转台角位置定位精度检测过程中，调整、对准误差对检测精度的影响，实现高精度检测。结果表明，转台最大角速度为2 (°)/s，调整、对准误差引起的角位置定位精度测量误差可以忽略，实测转台定位精度优于2.5″。转台满足高精度、低转速的空间激光通信终端轨道模拟要求。

Base on Coulomb friction model, the workpieces with different geometry rotating in free annular polishing are simulated. From simulation, the following conclusions are drawn. The angular velocity of workpiece is higher than that of polishing pad if the ring rotates uncontrolled in free annular polishing. The circular workpiece can synchronize with polishing pad through controlling the rotation of ring, which depends on the radii of ring and workpiece, the friction coefficients of polishing pad-workpiece and ring-workpiece, and the angular velocity of polishing pad. The workpiece with sharp corner cannot contact with the ring contiguously, which causes the contact state changing and the angular velocity of workpiece fluctuating ceaselessly, and this type of workpiece should be controlled with clamp to rotate synchronistically with the polishing pad.