Abstract
The BeiDou navigation satellite system 3rd generation (BDS-3) has been operating officially since the middle of 2020 which can provide service for the global users. The precise point positioning (PPP) time transfer is the crucial application for the global navigation satellite system. Besides the number of visible satellites, the performance of precise time transfer also strongly depends on the quality of satellite orbit and clock products. The contribution of this work is to comprehensively evaluate the precision of BDS-3 satellite orbit and clock of four post-processed products (GBM, IAC, WUM and SHA) as well as one real-time product (CNT) and analyze the performance of PPP time transfer using these products. The std of clock differences of IAC and WUM showed better agreement respect to GBM, followed by SHA and CNT. The statistics of four links show, of all the averaging time intervals, BDS-3 results estimated by the GBM, IAC and WUM scenarios are comparable, and they are more stable than those of CNT and SHA in the smooth time link in terms of frequency stability. Whereas, the discrepancy on the scenarios can be neglected in the noisy time link. For global position system (GPS) and Galileo PPP time transfer with different products, BDS-3 and Galileo has similar performance which are slightly worse than GPS.
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