电离层沿场不规则体几何散射模型

The model of ionospheric field-aligned irregularities scattering geometry

摘要: 电离层沿场不规则体散射具有很强的方向性, 利用其进行甚高频(Very High Frequency, VHF)频段超视距通信时, 需要准确可靠地确定散射轨迹以及地球上可接收散射信号的范围.文章基于电离层不规则体沿场散射的特点, 分析了入射波、散射波及散射点地磁方向之间的几何关系, 提出了一种电离层沿场不规则体散射几何分布模型.运用该模型对高中低纬度地区不同高度的电离层沿场不规则体散射进行了计算和分析, 并将计算结果与已有文献中的数据结果进行了对比, 结果比较一致.该模型能够计算电离层沿场不规则体VHF频段可接收信号的散射轨迹, 为VHF散射通信链路的设计、布站提供了依据和技术指导.

Abstract: Based on the characteristics of ionospheric field-aligned irregularities scattering, and by investigating the geometry relationship of incident, scatter wave and magnetic field derection of scattering point, a model of ionospheric field-aligned irregularities scattering geometry is derived, and different latitudes and height ionospheric field-aligned irregularities scattering are analyzed. The results predicted by the model have good agreement with data in the literatures. The model given herein can be helpful to construct VHF ionospheric scattering communication system.