多尺度扰动电离层宽带传播信道特性

项目名称： 多尺度扰动电离层宽带传播信道特性

项目编号： No.60871076

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 许正文

作者单位： 中国电子科技集团公司第二十二研究所

项目金额： 30万元

中文摘要： 电离层是复杂的电离和随机媒质，除了规则的时空变化外，还存在多种尺度的扰动和不规则体结构，它是卫星无线电系统的工作环境和传播信道。VHF～L 波段宽带卫星信号面临严重而复杂的电离层效应，其中宽带信号的色散和不规则体引起的随机传播等问题的关键机理尚不清楚，从而制约了宽带系统的设计和运行，成为卫星通信、导航和雷达领域共同关心的热点问题。本项目将探索多尺度扰动电离层宽带传播过程中亟待解决的传播机理和信道特性问题，针对VHF～L 波段卫星宽带信号面临的电离层效应，探索背景、扰动和不规则体等多尺度电离层结构对宽带信号传播特性的影响机理；基于传播机理和观测数据分析，探索如何合理地建立多尺度扰动电离层宽带信道特性和模型，为分析和量化宽带系统的电离层效应建立初步的传播理论和信道模拟方法。我国及邻近地区的电离层形态极其复杂，开展相关研究具有重要的科学意义和广阔的应用前景。

中文关键词： 电离层电波传播；随机介质波传播；宽带卫星信号；传播信道特性

英文摘要： As a complicated ionized and random medium, besides regular variations in time and space, the ionosphere has many multi-scale disturbances and irregular structures. It is the work environment and propagation channel of the satellite radio systems. The wideband satellite radio signals at VHF-L band will suffer severe and complicated effects of the ionosphere. Among those effects, the key mechanisms have not been cleared for the dispersion of wideband radio signals and random propagation due to the irregularities. It thus limits the design and operation of the wideband systems, and become a hot topic concerned simultaneously by satellite communications, navigation and radar communities. This project will make efforts to resolve the urgent issues of propagation mechanisms and channel characteristics of wideband radio signal in the multi-scale ionospheric disturbances. As to the ionospheric effects encountered by wideband satellite signals at VHF-L band, the mechanisms of effects on wideband signal propagation introduced by multi-scale ionospheric structures will be studied, such as the background, disturbances and irregularities. On the basis of analysis on the propagation mechanism and observations, it will be investigated how to reasonably develop the model and characteristic of the wideband signal channel in the ionosphere with multi-scale disturbances. The preliminary propagation theory and channel simulation method will be proposed for analyzing and quantizing the ionospheric effects on wideband systems. The behavior of the ionosphere over China and neighbor areas is so complicated that the related research has scientific importance and wide prospective applications.

英文关键词： Ionospheric radio propagation; Wave propagation in random media; Wideband satellite signal; Propagation characteristics of channel