Abstract:

Aiming at solving the problem of re initialization caused by loss of lock in signal tracking or cycle slips in most of the satellites in real time kinematic PPP, temporary data gaps due to loss of lock may be considered as cycle slips of phase observations in all satellites tracked, the observation model of Doppler observation in the instantaneous re initialization process is investigated, and mathematical model integrating pseudo range, phase, Doppler observation and predicted ionospheric variation information is proposed. Through fixing the cycle slip parameter of cycle slip occurred satellites to integers, instantaneous re initialization in real time kinematic PPP is realized. Based on numerical experiment, statistical analysis from multiple aspects reveals that introduction of Doppler observations could improve the success rate of cycle slip fixing, thus accelerating the process of instantaneous re\|initialization in real time kinematic PPP.

Key words: Precise point positioning (PPP), Doppler observation, Instantaneous re initialization, Real time kinematic positioning, Cycle slip fixing