为了探索出减缓飞行器在临近空间出现的通信“黑障”问题，结合毫米波大气窗口在大气传输的优越性，根据RAM C提供的飞行试验数据，建立双指数分布、Epstein分布和高斯分布三个等离子体鞘套模型，用Z-FDTD算法计算毫米波大气窗口在等离子体鞘套中传播的衰减特性。综合分析可得：可采用35 GHz所在的Ka频段和以220 GHz所在的太赫兹频段的双频测控工作通信系统，此搭配可较好满足对高超声速飞行器在临近空间巡航时的测控需求。window propagation in plasma sheath

With the research and development of hypersonic vehicles technology, the issues of ionization blackout have become increasing prominent during hypersonic flight. And there is the superiority of millimeter wave atmospheric window in atmospheric transmission. According to the data provided by radio attenuation measurement C (RAM C) voyage experiment, double-exponential distribution, Epstein distribution and Gaussian distribution models of plasma sheath were established. The principle of interaction between atmospheric window of millimeter wave and plasma was analyzed through Z-FDTD algorithm, getting the attenuation properties of atmospheric window of millimeter wave propagation in plasma sheath. The analysis by synthesis shows that the 35 GHz , the window of atmosphere in Ka waveband can be selected as communication waveband used in near space main communication platform, and subsidiary of 220 GHz in terahertz waveband airspace-based communication platform. It will carry on the real-time measurement and control when the reentering vehicles and hypersonic aerocraft voyage in the near space.