同时，球谐函数法的射线效应随光学厚度的增加而减小。
In addition, the ray effect in the spherical harmonics approximation mitigates with increasing optical thickness within gray medium.
文中运用了一种改进的球谐函数法，即换极法，大大简化了勒让德函数的递推计算，并进行了换极前后被动段扰动引力的仿真计算。
In this paper the improved method, also named transformation of the polar, is used to predigest the iterative calculation, and the simulation calculation has been progressed.
BP神经网络的系统误差修正方法的修正精度比球谐函数法提高约20%，有望用到球谐函数法不适用的三轴光电跟踪系统的系统误差修正中。
BP neural network system errors modifying method improves the precision than globe function method about 20% and may be used in three-axis photoelectric tracking system.
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