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Abstract

PPP-RTK (Precise Point Positioning - Real Time Kinematic) is consistently emerging as an alternative to provide centimeter level accuracy for real-time GNSS (Global Navigation Satellite Systems) positioning. This method is based on the Space State Representation (SSR) concept, which requires that errors affecting GNSS observables be either corrected or estimated in GNSS data processing. The parameters estimation is usually ensured by the application of the S-system theory. It has been shown that introducing atmospheric SSR corrections as a priori information to PPP-RTK users can significantly improve their results. PPP-RTK is especially useful in regions where only GNSS active reference stations with a sparse spatial distribution are available to users, such as South America. This region faces several challenges in GNSS positioning performance due to ionospheric disturbances, so providing high-quality ionospheric delay SSR corrections to PPP-RTK is crucial for enhancing GNSS applications there. Most PPP-RTK studies focus on geographic regions with low ionospheric activity. This contribution assesses an alternative for generating and applying SSR ionospheric corrections for simulated PPP-RTK users in regions affected by high levels of ionospheric activity. The proposed approach involves using adaptive constraints for ionospheric SSR corrections and ensuring consistency with the recommended International GNSS Service (IGS) standards for broadcasting SSR corrections to users. Preliminary results show that this approach can reduce the time required for PPP-RTK to achieve 10 centimeters horizontal accuracy by approximately 42%.