太赫兹通信具有高速率和良好的波束宽度等优点，特别适合空间信息网络应用。本项目将研究基于外调制方式的太赫兹空间通信系统关键技术。采用人工微结构与高电子迁移率晶体管阵列结构相结合构建一种新型复合结构的太赫兹调制器，通过深化研究在外加电压下单元结构中谐振模式、内部电场分布以及表面电流分布变化特性以及对入射太赫兹波传输特性的影响规律，掌握电控调制器的调控机制、设计方法与制备技术，研制出开关频率大于10GHz、调制深度大于50%的调制器件；掌握一比特量化高速信号处理新方法，为超宽带信号的耐奎斯特采样瓶颈问题提供低功耗的解决方案；开展太赫兹空间高速通信方案研究，掌握基于压缩感知的超分辨率跟踪对准算法。在0.2~1THz频段构建通信原理验证系统，开展原理验证实验，实现通信速率10Gbps。该项目的实施将为空间信息网络技术的发展提供新途径，对提升空间信息网络实时海量数据的传递能力具有重要的意义。

Terahertz communication is especially suitable for the application of space-based information network for its advantages such as high speed, good beam width and so on. The project will be committed to developing the key technology of terahertz space communication system based on the external modulation. Applying the combination of artificial microstructure (metamaterial) and high electron mobility transistor array structure, a new composite structure terahertz modulator will be constructed. The characteristics of the resonance mode, the internal electric field and the surface current distribution, and the influence on the transmission characteristics of the incident terahertz wave in cell structure under applied voltage will be deeply researched, and the modulation mechanism will be achieved. The design method and machining techniques of the terahertz electronic-control modulator will be grasped. On the basis of the sufficient researches above, the modulation device with switching frequency greater than 10GHz and the modulation depth more than 50% will be developed. An efficient, low power consumption, and reliable new scheme for high-speed signal processing based on one bit quantization will be developed to solve the bottleneck problem in Nyquist sampling of ultra wideband signals. The research on terahertz high-speed space communications scheme will be conducted, and the super-resolution tracking and alignment algorithm based on compressed sensing theories will be studied. The terahertz wireless communication theory verification system will be constructed and the principle of verification experiment will be implemented to obtain the 10Gbps communication rate. The project will provide new avenues for development of space-based information network technology, and it has great significance in enhancing the ability to transmit massive real-time data for space-based information network.