Experiment of BeiDou Asia-Euro All-in-View Time Transfer

Based on the pseudo-code observations of dual-frequency time-transfer receivers for satellite navigation, high-precision satellite orbit and clock difference products provided by the International Global Navigation Satellite System (GNSS) Service (IGS) are used to realize the time comparison of the BeiDou All-in-View method. This method takes the time scale provided by IGS as the common reference time of two stations to be compared. Firstly, the effect of the ionosphere on pseudo-range observations is eliminated by using the dual-frequency combination method. Then, the delay caused by the troposphere and the earth rotation effect is deducted by using the theoretical model in pseudo-code observations. After the difference between the two stations and the common reference time is obtained respectively, the results of All-in-View time comparison of BeiDou are given. Taking the national standard time maintained by the National Time Service Center (NTSC) of the Chinese Academy of Sciences, Physikalisch-Technische Bundesanstalt (PTB), and Real Instituto y Observatorio de la Armada (ROA) as comparison objects, a long baseline BeiDou All-in-View time comparison test is carried out. Two key performance indicators, Allan deviation and time deviation, and two-way satellite time and frequency transfer are used to evaluate the performance of the BeiDou All-in-View method. The results show that the stability of BeiDou All-in-View time comparison can reach the order of magnitude of 1 \times 10^-14