高精度微波时频传递链路体制设计及关键技术

高精度时间频率的产生和超高精度时频信号的传递是现代物理学、天文学和计量科学的基础，中国空间站高精度时频科学实验系统已随“梦天舱”成功发射，标志着我国天地融合、立体交叉的国家时频系统建设迈出了关键一步。介绍了高精度时频科学实验系统项目的基本情况以及微波时频传递链路的研究进展，重点阐述了高精度时频系统微波传递链路的信号体制设计，基于提出的信号体制设计了同频+三频两种微波时频传递链路比对模式并给出了钟差比对模型，最后通过仿真及在轨实测数据分析表明设计的微波时频传递链路可实现亚皮秒级伪距测量精度。

System design and key technologies of high-precision microwave time-frequency transmission links

The generation of high-precision time-frequency signals and the transmission of ultra-high-precision time-frequency signals arethe foundation of modern physics, astronomy, and metrology. The high-precision time-frequency scientific experimental system of theChinese space station has been successfully launched with the " Mengtian" cabins, which marks a crucial step in the construction ofChinese national time-frequency system with integration and interchange of space and ground. This article provides an overview of thehigh-precision time-frequency scientific experimental system project and the research progress of microwave time-frequency transmissionlinks, with focus on the signal system design of the microwave transmission link in high-precision time-frequency systems. Based on theproposed signal system, two microwave time-frequency transmission link comparison modes of the same-frequency and three-frequencyare designed, and a clock difference comparison model is provided. Finally, simulation and in-orbit measurement data analysis show thatthe designed microwave time-frequency transmission link can achieve sub-picosecond pseudo-range measurement.