星地激光通信复合轴APT系统仿真研究

Research on compound-axis APT system in satellite and ground station laser communication

为了满足高效星地激光通信的要求,研究了一种复合轴APT(Acquisition、Pointing、Tracking,APT)系统,在分析直流电机驱动转台和压电陶瓷振镜的结构和工作原理的基础上,构建了相应的数学模型,并设计控制器。分析了卫星平台振动、离散扰动和大气抖动对系统跟踪性能的影响,利用振动功率谱和光斑漂移分布函数给出扰动源的数学描述。在数学模型的基础上构建完整的系统仿真模型,仿真实验结果表明,复合轴APT系统具有良好的运动跟踪性能和抗高频干扰能力。构建的仿真系统可以很好的指导实际系统的分析设计和评估。

In order to meet the requirements of efficient satellite and ground laser communication, study on a compound-axis APT （Acquisition, Pointing, Tracking, APT） system. On the basis of analysis of the structure and operating principle of the DC motor and PZT, construct mathematical models and design the controllers. Analyse influence on the tracking performance from satellite platform vibration, discrete disturbances and atmospheric turbulence and describe their mathematic models with vibration power spectrum and spot drift distribution function. Transform them to a complete system simulation model, and the simulation results show that the compound-axis APT system has good performance on motion tracking and resistance to high- frequency interference. It can be a good guide to the analysis, ＇design and evaluation of the real system.