地—星上行激光通信中大气折射及色散引起的对准误差

Pointing error induced by atmospheric refraction and atmospheric chromatic dispersion for earth-to-satellite laser communication

在地—星上行激光通信中,大气折射引起激光束传播方向偏折,使激光束更难对准卫星。根据大气温度垂直分布的线形分段模型,采用数值迭代方法计算了大气的折射及色散。分析了在天顶角、地面站海拔高度、超前对准及激光波长等参数影响下,大气折射及色散引起的对准误差。研究结果表明:对于波长范围较大的多波长激光通信系统,需要考虑大气色散引起的对准误差。

Uplink laser beam is more difficult to point satellite for earth-to-satellite laser communication because of the atmospheric refraction. Atmospheric refraction and atmospheric chromatic dispersion values were calculated through numerical iteration based on the segmented linear model of vertical atmospheric temperature profile, Pointing error induced by atmos-pheric refraction and atmospheric chromatic dispersion is analyzed for different zenith angle, altitude of ground station, point ahead angle and operating wave band, Research results show that the pointing error induced by atmospheric chromatic dispersion should be considered for multi-wavelength systems with large wavelength range.