电离层三维射线追踪的快速计算方法

A fast ray tracing algorithm in the ionosphere

基于三维射线追踪的Haselgrove方程,实现了快速电离层短波数字的三维射线追踪。根据射线传播的几何关系,给出在电离层以下部分的射线参数计算方法。根据电子浓度梯度的变化和自适应Runge-Kutta法,给出了三维射线追踪中自适应改变积分步长的快速计算方法,并以准抛物电离层模型为例,讨论了利用本文方法与解析解相比的精度,以及与各种不同步长相比的时间和精度。结果表明:采用本文方法在相同精度下速度至少可以提高一个数量级。

Based on the Haselgrove ray equation, the fast 3-D ray tracing of the short wave in the ionosphere is realized. In accordance with the geometrical relationship of the ray with the earth and the ionosphere, the method for calculating the parameters of the ray under the ionosphere is presented. According to the variation of electron concentration gradient with the height and the self-adapting Runge-Kutta method, a method for automatically changing integral step along the ray is described. For a QP ionosphere model, the comparison of the accuracy and speed between the fast 3-D ray tracing and the analytic ray tracing is discussed, the result shows that the fast 3-D ray tracing improves the speed an order of magnitude while the accuracy maintained.