临近空间高速飞行器综合信道模型研究

Research on Integrated Channel Model for Near-Space Hypersonic Vehicle

针对临近空间飞行器在高速飞行时所经历的高动态多普勒和等离子鞘套等恶劣通信环境以及其通信中断问题,提出了临近空间高速飞行器的综合信道模型方案,在对综合信道内电波传输信道特性分析的基础上将其建模为频率选择性快衰落信道;同时建立了等离子鞘套信道的数学模型,利用传输矩阵法和FDTD算法计算了表征大尺度衰落的电波传输透射系数,并根据散射信道建模方法给出了小尺度衰落的仿真模型并对其参数的获取进行了分析。仿真计算和定性分析表明了该综合信道模型方案的可行性。

An integrated channel model including a radio transmission channel and a plasma sheath channel is proposed to solve Hypersonic Near-space Vehicle（HNSV） communication blackout caused by high dynamic Doppler shift and plasma sheath.The radio transmission channel is advised to model as a frequency selective fast fading channel on the basis of analysis of its channel coherence time and bandwidth characteristic.The plasma sheath mathematic model is composed of large scale fading,small scale fading and noise,transmission power coefficient representing large scale fading can be obtained by calculation of radio wave transmission characteristic using scatter matrix method（SMM） and FDTD method,and achievement of time delay power spectrum and Doppler power spectrum necessary for small scale simulation is also discussed briefly.Integrated channel scheme would provide a new way to solve hypersonic flight communication blackout in Near-space.