Abstract:Aiming at the problem of black barrier in near space communication of hypersonic vehicle， a method of tracking, telemetry and command (TT & C) communication using terahertz wave is proposed. Based on the time-varying and inhomogeneous plasma model， the shift operator finite difference time domain (SO-FDTD) method is used to analyze the influence of different plasma parameters on electromagnetic wave scattering characteristics. On this basis， the model of terahertz anti-black barrier TT & C system is established， and the performance of terahertz anti-black barrier TT & C system is mainly studied. Combined with the actual communication system parameters and environmental parameters， the performance simulation of terahertz anti-black barrier TT & C communication system is carried out. The results show that the communication distance， plasma rise time， temperature and pressure all have an impact on the BER performance of the communication system， and the communication distance has a significant impact on the system performance. In general， increasing the frequency of incident wave is an effective way to reduce the influence of plasma. Secondly， in order to ensure the BER performance of the system， a reasonable communication distance should be designed according to the link budget.