QPSK调制通信信号在等离子体鞘套中传输特性计算模型及仿真分析  

The Simulation and Analysis to the Propagation Characteristic of the QPSK Signals in Reentry Plasmas

作　　者：邬润辉[1,2] 刘佳琪 刘鑫[1,2] 赵巨岩 任浩[3] Wu Run-hui;Liu Jia-qi;Liu Xin;Zhao Ju-yan;Ren Hao(Beijing Institute of Space Long March Vehicle,Beijing,100076;National Key Laboratory of Science and Technology on Test Physics&Numerical Mathematics,Beijing,100076;Beijing Aerospace Wanyuan Technology Co.,Ltd,Beijing,100076)

机构地区：[1]北京航天长征飞行器研究所,北京100076 [2]试验物理与计算数学国家重点实验室,北京100076 [3]北京航天万源科技有限公司,北京100076

出　　处：《导弹与航天运载技术》2020年第6期121-126,共6页Missiles and Space Vehicles

基　　金：国家自然科学基金(61302029、61571031、61571031、61871018)。

摘　　要：为获取等离子体鞘套对四相相移键控(Quadrature Phase Shift Keying,QPSK)调制信号传输影响特性,建立等离子体鞘套中QPSK调制信号传输特性的仿真模型,开展等离子体鞘套对信号全屏蔽、信号能量衰减和相位改变的仿真计算与分析。结果表明,当等离子体鞘套的频率大于临界频率时,QPSK信号将被等离子体鞘套完全屏蔽;当QPSK信号能够在等离子体中传播时,由于等离子体鞘套对信号相位改变和幅度衰减将大大提高QPSK通信系统的误码率。该仿真与分析方法可用于分析等离子体鞘套对FSK和ASK调制信号传输特性影响。In order to obtain the influence of communication system which is produced by reentry plasmas,a mechanism of QPSK signals through reentry plasmas which surround vehicles travelling at hypersonic velocities is proposed,and the simulation model of the QPSK signals propagation in plasma sheath is described.Then the absolute interdict,the energy attenuation and phase variable of QPSK signals which are transmitted by reentry plasmas are computed.And the analysis results are shown that the QPSK signals would be shielded thoroughly if the plasma frequency is bigger than carrier frequency,and when the QPSK signals can propagate in reentry plasmas,the bit error probability(BEP)of communication systems would be improved by reentry plasmas which are ability to absorb the signals energy and vary signals phase.The simulation and analysis technique can also be used to calculate many other communication models such as FSK and ASK.

关 键 词：QPSK信号 等离子体鞘套 传输特性 仿真模型 

分 类 号：V41[航空宇航科学与技术—航空宇航推进理论与工程]