导航卫星时频系统发展综述

A Survey of Navigation Satellite Time-frequency System

关键词:  导航卫星  时频系统  星载原子钟  时频生成与保持  星间时频同步

Key words:  Navigation satellite  Time-frequency system  Space-borne atomic clock  Frequency generating and keeping  Intersatellite time-frequency synchronization

摘要:

全球各大卫星导航系统近年来发展迅速,性能持续提升，其中卫星时频系统的高性能、稳定可靠和保持星间时频同步是系统实现高精度测量的基础。介绍了目前应用于各卫星导航系统的铷钟、氢钟、铯钟等星载原子钟和时频生成与保持技术的特点、发展概况及在轨应用情况。面向精度提升和自主运行能力提升的需求，分析了可能应用于下一代导航卫星的星载原子钟技术、星上时频生成与保持单元性能提升方法以及星间高精度激光时频同步技术，以支撑未来时频基准的天基化和我国综合PNT体系的建设。

Abstract:

The navigation satellite systems have been developing rapidly in recent years and their performance is improved continually. Satellite time-frequency system is the basis to achieve precision measurement of the navigation system because of its high performance, stable and reliable operation and keeping intersatellite synchronization. We present an overview on the current state of the space-borne atomic clock, such as rubidium atomic frequency standard, hydrogen maser, cesium beam frequency standard and the standard frequency generating and keeping technology. To improve the accuracy and autonomous operation capability of navigation satellite system, technologies that may be used on new generation of payloads in the future are analyzed, including new space-borne atomic clock, better standard frequency generating and keeping unit, and high-precision time-frequency synchronization by intersatellite laser link. All of these will support the development of space-based time-frequency reference and the establishment of integrated PNT system in China.