Several noteworthy breakthroughs have been made with the BeiDou Navigation Satellite System (BDS) and other global navigation satellite systems as well as the associated augmentation systems, such as the commissioning of the BDS-3 preliminary system and the successful launch of the first BDS-3 GEO satellite which carries the satellite-based augmentation payload. Presently, BDS can provide basic services globally, and its augmentation system is also being tested. This paper gives an overview of BDS and satellite navigation augmentation technologies. This overview is divided into four parts, which include the system segment technologies, satellite segment technologies, propagation segment technologies, and user segment technologies. In each part, these technologies are described from the perspectives of preliminary information, research progress, and summary. Moreover, the significance and progress of the BeiDou Satellite-based Augmentation System (BDSBAS), low earth orbit augmentation, and the national BeiDou ground-based augmentation system are presented, along with the airborne-based augmentation system. Furthermore, the conclusions and discussions covering popular topics for research, frontiers in research and development, achievements, and suggestions are listed for future research.

中文翻译：

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北斗导航卫星系统（BDS）和卫星导航增强技术的进步

北斗导航卫星系统（BDS）和其他全球导航卫星系统以及相关的增强系统已经取得了一些值得注意的突破，例如BDS-3初步系统的调试和第一个BDS-3的成功发射承载基于卫星的增强有效载荷的GEO卫星。目前，BDS可以在全球范围内提供基本服务，其扩充系统也正在接受测试。本文概述了BDS和卫星导航增强技术。此概述分为四个部分，包括系统段技术，卫星段技术，传播段技术和用户段技术。这些技术的各个部分都是从初步信息，研究进展，和总结。此外，还介绍了北斗卫星增强系统（BDSBAS），近地轨道增强以及国家北斗地面增强系统以及机载增强系统的意义和进展。此外，总结和讨论涵盖了热门研究主题，研究前沿，成就和建议，以供将来研究之用。