An Approach for Mitigating PPP Day Boundary with Clock Stochastic Model

The research on the mitigation on the jump of the day boundary is a perpetual topic for the time-filed scholars. Compared to GPS, the results operated by multiple Global Navigation Satellite Systems (GNSSs) may alleviate the jump not remove the jump. Focused on this problem, the new algorithm is proposed as here: three-stated clock model is added to the observation, the characteristic of clock is fully recovered. The ambiguity should be initialized in the first epoch of each day for constraining jump fiercely to the ambiguity parameter so as to get a clean receiver clock parameter. In order to validate whether the approach works, six kinds of combinations of three stations were analyzed. Compared to traditional solutions, the jump of three stations is removed completely. With respect to the frequency stability, the new model has an absolute superiority than that of traditional solution, particularly in the short-term, the maximal improvement is up to 80%.