Real-Time Detection and Repair of Cycle-Slip Based on Pseudo-range Phase Combinations for Un-differenced GNSS Triple-Frequency Observations

摘要

For the detection and repair of cycle-slip for un-differenced GNSS triple-frequency observations, current algorithms have difficulties in efficiency, stability and even some special cycle-slip combinations cannot be detected. This paper investigates the strategies in real-time detection and repair of cycle-slip. Geometry free ionospheric free code-phase combinations together with phase combinations are used, where the selection criteria of combination coefficients is based on the principle of the minimal condition number. Advantage of the method is that each cycle-slip value can be calculated without searching, thus the efficiency is improved and success rate is still high. Experiment results show that even under the severe ionospheric conditions, cycle-slips of triple-frequency un-differenced observations can be detected and repaired.