利用射线追踪研究电离层扰动

A study of the disturbance in the ionosphere using ray tracing technology

基于返回散射探测的电离层扰动电离图,本文建立了一个新的对称的准余弦电离层扰动数学模型.基于这种模型,利用HF射线追踪技术合成了HF电离层返回散射电离图,并利用迭代的技术拟合了高频返回散射设备探测的电离层扰动电离图的Pmin-f曲线(Pmin为最小时延,f为工作频率) ,从而推断了沿探测路径电离层扰动区域的位置及大小,扰动的临界频率波动的幅度.最后基于这种电离层扰动模型,利用射线追踪技术描述了不同电离层扰动参数下的电波传播情况,研究了其天波传播的跳距、覆盖区域的大小及射线“俘获”等.

Based on the ionogram of the ionosphere disturbance obtained from backscatter sounding, in this paper, a new symmetrical quasi-cosine function is introduced to describe the ionosphere disturbance model. And, based on this kind of symmetrical quasi-cosine model, an iterative method is applied to fit the observed P_ min-f curve, and a set of desirable parameters of the ionosphere disturbance are derived. Finally, we describe the propagation condition of HF radiowaves in the ionosphere disturbance region with various parameters of ionosphere disturbance via ray tracing technology, and analyze the irradiation range,the jump distance and seizing of the radiowaves traversing the ionosphere disturbance region.