动态等离子鞘套信道模型研究

项目名称： 动态等离子鞘套信道模型研究

项目编号： No.61301173

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 石磊

作者单位： 西安电子科技大学

项目金额： 24万元

中文摘要： 再入过程或者近空间高超声速飞行器在超音速飞行过程中，等离子鞘套造成的通信中断问题（黑障）一直制约着我国航天事业的发展。等离子鞘套信道模型的预测和建立是设计克服黑障测控通信体制的前提和核心，为了深刻理解动态等离子鞘套信道，本研究拟从动态等离子体与电波相互作用机理研究出发，建立动态等离子物理模型，深入分析动态等离子体内电波传播特性和信号特性，明确等离子鞘套传输信道特性与等离子体电子密度分布和碰撞频率特别是电子密度抖动的关系，采用双频双点互相关法计算获取信道的时延功率谱和多普勒功率谱；结合广义宽平稳不相关散射信道建模理论，设计等离子鞘多普勒成型滤波器，构建等离子鞘套理论信道模型；同时利用动态等离子鞘套地面模拟实验平台进行电波传播、信号特性和信道参数的测试以对理论信道模型做验证和修正。本研究可为国内克服等离子鞘套黑障问题提供通信信道基础理论支持。

中文关键词： 等离子体鞘套；动态；电波传播；信道建模；

英文摘要： Communication interruption problems (blackout) caused by plasma sheath for reentry or nearspace hypersonic vehicles have been restricting the development of the aerospace tracking, telemetry, and command (TT&C) industry. The prediction and establishment of plasma sheath channel model play the fundamental role in communication scheme design planning to overcome blackout. Starting from the dynamic plasma wave interaction mechanism, this study establishes the dynamic plasma physics model first and then analyzes radio wave propagation signal characteristics within dynamic plasma sheath in-depth in order to make clear of the channel characteristics with the electron density distribution, collision frequency and in particular of electron density fluctuation. The Mutual Coherence Function method is employed to calculate delay power spectrum and Doppler power spectrum for channel modeling. The plasma sheath theoretical channel model plasma sheath would be established by designing Doppler shaping filter under the wide stationary unrelated scattering channel modeling theory. Simultaneously, dynamic plasma sheath ground simulation and software defined radio platform are used to test signal characteristics and channel parameters for purpose of validating and modifying the theoretical channel model. The plasma sheath simulat

英文关键词： Plasma Sheath；Dynamic；EM Propagation；Channnel modeling；