临近空间黑障区高温尘埃等离子体中太赫兹波电磁特性研究

项目名称： 临近空间黑障区高温尘埃等离子体中太赫兹波电磁特性研究

项目编号： No.41304119

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 王茂琰

作者单位： 电子科技大学

项目金额： 25万元

中文摘要： 临近空间高速飞行器发生通信中断的黑障现象尚未有彻底消除的方法，近年来太赫兹波技术的发展为其提供了有效的解决手段，然而太赫兹波在等离子体中传播理论的研究较少，且该理论未考虑原子分子的振动和转动频率都处于太赫兹频段的带电尘埃颗粒作用。针对目前的发展现状，本项目拟将从以下两个方面开展工作，主要内容包括：1) 利用太赫兹反射成像原理确定黑障区飞行器周围尘埃等离子体的截止频率，理论推导和完善高温尘埃等离子体本构关系、色散关系，从而建立黑障区太赫兹频段高温尘埃等离子体理论模型；2) 全面开展太赫兹波在临近空间黑障区高温尘埃等离子体中电磁特性的研究，分析尘埃充电、电子温度等对太赫兹信号传输的影响，为将来实际利用太赫兹波探测解决黑障问题奠定预先理论基础。预期的研究成果将会大大促进空间等离子体物理和电磁场理论的发展，推动太赫兹技术在信息通信领域的应用，以及促进雷达目标特性与空间信息技术等学科的交叉发展。

中文关键词： 太赫兹；尘埃；等离子体；电磁；特性

英文摘要： There is no perfect method to completely eliminate the ionization blackout phenomena about the communications interruption of high speed spacecraft in near space yet. Recently, the development of Terahertz wave technology provides an efficient way to solve the problem. However, the study on Terahertz wave propagation in plasma theory is comparatively rare. Meanwhile the effects caused by charged dust particles are not included into the theory. Both vibration frequency and rotation frequency of the dust particles' atom and molecule are at Terahertz wave frequency band. The below two issues will be further investigated in the project according to the current development situation. The main contents are as follows. 1) Cutoff frequency of dusty plasma around spacecraft in the blackout zone will be studied with Terahertz wave reflection imaging principle. The constitutive relation and dispersion relation of thermal dusty plasma will be theoretical deduced and consummated. Consequently the theoretical model for thermal dusty plasma in the blackout zone at Terahertz wave frequency band will be built. 2) Research on electromagnetic characteristic of Terahertz wave propagation in thermal dusty plasma of blackout zone in near space will be fully implemented. The effect to Terahertz wave transmission caused by dust chargi

英文关键词： Terahertz；dust；plasma；electromagnetic；characteristic