Study on BeiDou all-in-view time transfer

With the development of Global Navigation Satellite System (GNSS) time transfer, the GPS All-in-View (AV) time transfer has being considered to replace common-view for computing the links of International Atomic Time (TAI). Now, GPS AV is one of the major technologies by BIPM to link all the time keeping labs in the world. To promote the application of Chinese BeiDou navigation system for the realization of TAI. In this paper, BeiDou All-in-view time transfer was studied between National Time Service Center, Chinese Academy of Sciences (NTSC) and Telecommunication Laboratories, Chunghwa Telecom. Co., Ltd (TL) through the IGS precise satellite orbit and clock products. It is proved that the STD of Common Clock Difference (CCD) through BeiDou All-in-view is less than 1ns, the STD of NTSC-TL AV link is better 1.5ns and the it's stability can reach to 1E-14 (1 day). This is almost the same level with GPS. It is show that BeiDou can be used for the nanosecond level time transfer. And this is also support that BeiDou will be involved as the official method in the calculation of TAI in future.