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针对高超声速飞行器在临近空间巡航时出现的通信“黑障”问题,根据NASA开展的无线电衰减测量C(RAM C III)飞行试验数据,把临近空间分成两个空间层构建数学模型,建立了2个一维非均匀等离子体鞘套模型,通过数值计算分析了等离子体与太赫兹波的相互作用机理,得到了太赫兹波在非均匀等离子体鞘套中传输特性曲线。仿真结果表明:把太赫兹波段作为临近空间平台通信,有利于解决黑障问题。此论证结果,可为设计临近空间高超声速飞行器选用通信频段时提供参考。
According to NASA flight test data of radio attenuation measurement C (RAM C III), the near space is divided into two space layers to build a mathematical model to establish the communication “black barrier” problem when the hypersonic vehicle cruises in the vicinity. Two one-dimensional non-uniform plasma sheath models were established. The mechanism of the interaction between plasma and terahertz wave was analyzed numerically and the transmission characteristic of terahertz wave in the non-uniform plasma sheath was obtained. The simulation results show that the terahertz band as a near-space communication platform is conducive to solve the black barrier problem. The result of this demonstration can provide a reference for the design of the communication frequency band of hypersonic vehicles in the near space.