空地激光通信跟踪精度主要外界影响因素研究

Primary Environment Influence Factors to Tracking Precision in Space-ground Laser Communication

为了分析空地激光通信外界因素对跟踪精度的影响情况,将平台振动、大气湍流和背景光三个主要影响因素归结到对跟踪精度影响的统一框架下进行了研究。使用实际测量得到的平台振动数据,建立空地激光通信跟踪仿真系统,分析了不同条件下,三种外界因素对跟踪精度的综合影响情况。在文中假设基础上,分析可知:粗跟踪单元可以较好的抑制地面运动平台的振动,保证激光能够进入精跟踪视场;中强度的湍流使精跟踪残差标准差增大4倍左右,如果试验地点选择在高海拔地区,大气湍流使精跟踪残差标准差增大2倍左右。

In order to analyze influence of the external factors to the tracking precision of space-ground optical communication, the platform vibration, atmospheric turbulence, and background light are studied, and can be attributed to the influence of tracking precision. Tracking simulation system is founded on the basis of measured platform vibration data. The compositive influence of various factors to tracking precision is analyzed under different conditions. Based on the assumptions, coarse tracking can well suppress the vibration of mobile platform on ground and ensure that laser beam can enter fine tracking field; the middle atmospheric turbulence increases the standard deviation of fine tracking error to about four times; if low altitude area is selected as examination spot, atmospheric turbulence will increase standard deviation of fine tracking error to about two times.