利用地基激光器攻击大气层外目标时,需修正大气折射对激光传输的影响.大气折射指数随高度变化,会发生折射效应.由Snell定律出发,研究了激光穿越大气层时的折射误差.通过实例,计算了折射误差与激光束初始仰角的关系,计算结果表明,低仰角时折射误差大,高仰角时折射误差小.最后提出了攻击卫星时误差修正需考虑的问题.

The refractive error of ground-based laser attacking space targets such as satellites is discussed. The refractive index of atmosphere is variable according to the height. Based on the Snell law, the refractive error due to laser beam going through atmosphere is studied. The relationship between the refractive error and the initial elevation of laser beam is calculated by an example. According to the result, the refractive error is big when the elevation is low and the refractive error is small when the elevation is high. At last, some problems are also raised.