Abstract: With the widespread application of Global Navigation Satellite System (GNSS) and the continuous emergence of new navigation and timing technologies, GNSS development and applications have entered a new stage internationally since 2020. While various countries are strengthening research on the integration of GNSS with other PNT technologies, they are also placing greater emphasis on system innovation as well as improvements in accuracy, continuity, integrity, and security to make GNSS the core of comprehensive PNT architectures. Based on a systematic review of the achievements in the construction of foreign GNSS and China’s BeiDou navigation satellite system (BDS), development trends for satellite navigation systems are investigated and summarized. In accordance with the requirements for building an integrated PNT architecture centered on satellite navigation, the new needs of GNSS users and the missions of new BeiDou satellites are analyzed. Finally, key technologies that should be prioritized are proposed for research, aiming to provide support for advancing satellite navigation technologies and build a BeiDou system featuring “more advanced technologies, stronger capabilities, and higher-quality services”.

Key words: navigation satellite, comprehensive PNT, BeiDou navigation satellite system (BDS), user needs, mission requirements, key technologies