【摘要】 从射线的矢量微分方程出发 ,采用龙格 -库塔方法求解射线参数方程 ,实现了电离层中的射线追踪 .根据电子密度梯度的变化 ,相应地改变积分步长 ,即采取所谓的实时变步长技术 .并以二维球面分层准抛物电子密度模型和赤道双峰模型为例 ,采用了变步长射线追踪技术 ,讨论了该方法在计算速度和精度方面对原有方法的改进 .结果表明 ,采用变步长技术既能使计算快速进行 ,又保证了很好的精度 .更多还原

【Abstract】 Starting from ray equation, the ray parameters can be solved by using the Runge\|Kutta method. The integral step can be adjusted automatically according to the gradient of the electron density, which is called Step\|Changing technique. Examples were presented to show the efficiency of this technique for the quasi\|parabolic layer and equatorial double torus model. The results show that this technique gives a great improvement in the speed of ray\|tracing, while the accuracy has been maintained.更多还原