等离子鞘套寄生调制效应实时预估与自适应检测解调方法

With the development of the hypersonic vehicles and reentry vehicles, to eliminate the interference of plasma sheath and to realize the reliable and uninterrupted communication become the urgent requirement at present. Research shows that, the parasitic modulation of the signals caused by the dynamic plasma sheath is one of the main reason which causes the failure of communication. This subject aims at the parasitic modulation caused by the dynamic plasma sheath. The interaction mechanism between the dynamic plasma sheath and the radio wave, antenna is studied. The propagation in the dynamic plasma model is established. The influence of the dynamic plasma to signal propagation is revealed. The relationship between the variation of antenna parameters and plasma is analyzed. The real-time estimate method of parasitic modulation of electromagnetic signals caused by plasma sheath is proposed in this subject. This method measures the VSWR variation of the transmitting antenna on the vehicles, estimates the parasitic modulation of electromagnetic signals caused by time-varying plasma sheath. Based on the estimated data, an adaptive demodulation method for the communication signal after the plasma sheath is proposed, to eliminate the effects of the parasitic modulation caused by plasma sheath. At last, a dynamic plasma generator for the signals transmission in the dynamic plasma experiments is built to verify the effectiveness of the estimate and demodulation method.

随着临近空间高速飞行器以及再入航天器的发展，消除等离子鞘套干扰，实现连续可靠信息传输已成为目前的迫切需求。研究表明，等离子鞘套动态特性引起的寄生调制效应成为制约通信可靠性的主要因素之一。本课题针对寄生调制效应，研究等离子体动态性与电磁波、天线的相互作用，建立动态等离子体中的信息传输模型，揭示等离子鞘套寄生调制效应对信息传输的影响机理；分析天线参数变化与等离子体之间的关系，提出一种基于天线驻波比检测的等离子鞘套寄生调制效应实时预估方法，利用飞行器上已有的飞行器天线，通过测量等离子鞘套造成的天线驻波比变化，预估出寄生调制效应对透射信号的畸变影响；并根据预估数据，给出一种通信信号自适应检测解调方法，减弱甚至抵消等离子鞘套寄生调制效应的影响；搭建等离子鞘套下电波传播与反射测量实验装置，开展理论验证和初步的演示实验。

本项目研究目标和研究内容基本按照申请书和计划任务书执行。完成原计划的动态等离子体鞘套寄生调制效应机理分析，提出了一种基于天线驻波比的等离子鞘套信道参数实时预估方法，实现基于天线波阻抗测量的信道状态实时判断，对鞘套信道分类，指导通信策略进行适应性调整，传输信息根据信道状态实现分优先级传输。同时，针对寄生调制效应，提出一种基于谱聚类的新型自适应判决方法和一种基于主曲线学习的再入信道估计与解调联合算法。在研究内容和目标上完成了项目的原计划目标。.三年来，以项目第一负责人为第一作者及通信作者发表电波传播与通信类SCI论文5篇，其中2区以上文章2篇；以项目第一负责人为首申请发明专利7项，其中授权2项；圆满完成既定成果目标。