A BDGIM-Based Phase-Smoothed Pseudorange Algorithm for BDS-3 High-Precision Time Transfer

Single point positioning (SPP) can meet the requirements of majority real-time time transfer applications. Meanwhile, a single-frequency (SF) receiver is cheaper than dual-frequency receiver. However, SPP performance be greatly affected by large pseudorange observation noise. Phase smoothing an effective approach to reduce Since classical phase-smoothed algorithm does not account for effect ionosphere delay, we propose BDGIM-based eliminate ionospheric delay and apply it BeiDou Navigation Satellite System (BDS-3) transfer. In this paper, first evaluate global correction model (BDGIM) compare with that Klobuchar determine if practical incorporate BDGIM into our suggested method. The better model. mean RMS value 2.6 Total Electron Content Unit (TECU). average rate 75.5%. Then, investigate improved SF much traditional Compared transfer, Type A uncertainty 2.08 ns, which reduced about 11.1% from without it. Regarding frequency stability, modified Allan deviations are 1.43E-12 1.68E-13 at 960 s 61,440 s, improvements 51.2% 59.9%, respectively.