Inversion Method of Tidal Level Based on GNSS Triple-Frequency, Geometry-Free, Non-Ionospheric Phase Combination

Using the navigation signal transmitted by GNSS (global satellite system), satellites for tide level monitoring comprise one of important research fields marine remote sensing. Regarding problem that GNSS-MR (multipath reflectometry) technology only uses carrier SNR (signal noise ratio) data, resulting in lack data early CORS (continuously operating reference stations) stations, it is impossible to carry out inversion. In this paper, a method inversion based on triple-frequency geometric ionospheric free combined-phase observations instead proposed. The simultaneous interpretation from sc02 station Friday Harbor US carried and compared with traditional GNSS-IR (interference tide-inversion method. experimental results show proposed paper has same trend as measured trend. accuracy evaluation shows RMSE value 15 cm correlation coefficient r 0.984, which verifies effectiveness expands tide-level monitoring.