Precise Point Positioning with Ionospheric-Free Deviation Mask under Ionospheric Scintillation in Equatorial Region

One of the most challenging phenomena threatening performance satellite navigation services is ionospheric scintillation, characterized by rapid fluctuation in amplitude and phase received radio signals. Although scintillation high-latitude regions mostly caused refractive effect which can be eliminated dual-frequency measurements, non-dispersive diffractive experienced low-latitude region still hazardous. This paper introduces an improvement into Precise Point Positioning (PPP) using a cycle-slip corrector based on ionosphere-free (IF) combination mask recently introduced index called Sigma-IF for conventional receivers. A comparison with from standard deviation geometry-free (GF) made analyzed. significant accuracy continuity PPP after applying proposed method presented results obtained well-known IGS stations. The increasing number Global Navigation Satellite Systems (GNSSs) receivers launched mass market promising enhancement to integrity location-based applications.