Abstract
Global Navigation Satellite System (GNSS) time offset is one of the most important foundations for GNSS interoperability. BeiDou satellites broadcast BeiDou time and other GNSS time offset parameters (BGTO parameters) through navigation messages, ensuring that receivers can use multiple GNSS systems for integrated positioning. In this paper, the definition of the time offset error (BGTOE) are studied; the quantitative relationships between BGTOE and joint positioning result and accuracy are derived. Then the BGTOE is accessed based on the data of UTC(k) and BIPM Circular T. Evaluation results show that the fluctuation range of BGTOE is about 27 ns, and the standard deviation is about 10 ns. It will produce a position offset of 12.6 m and a time offset of 14.7 ns for joint positioning results. In a longer time scale, it will bring about a loss of position accuracy of about 10 m and a loss of time accuracy of about 20 ns, which can basically meet the needs of joint positioning, but there is still room for optimization from the prospect of improving the joint positioning performance.
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