Rx Networks High Precision SSR2OSR Service

Hakeem Wewala, Ali Soliman, Aaron Boda and Vijaykumar Bellad

Abstract:	High-precision real-time kinematic (RTK) is the standard for achieving centimeter-level positioning. RTK relies on differential corrections from a nearby global navigation satellite system (GNSS) reference station—physical or virtual—sent in observation-state representation (OSR). Network RTK (NRTK) services generate virtual reference stations but require dense regional reference networks, making them expensive and limiting adoption in emerging applications. Modern high-precision GNSS receivers are multi-constellation and multi-frequency, enabling precise point positioning (PPP), PPP with ambiguity resolution (PPP-AR), and PPP-RTK. These techniques use state-space representation (SSR) corrections and achieve centimeter to decimeter-level accuracy with far sparser global networks than NRTK. However, commercial off-the-shelf (COTS) receivers more commonly support OSR than SSR, restricting direct use of PPP-RTK services. Rx Networks addresses this gap by converting PPP-RTK SSR corrections into OSR through its TruePoint | FOCUS (TP | F) SSR2OSR service. The service operates in real time using sparse, multi-constellation, multi-frequency reference networks in the U.S. and Europe. It delivers dual and multi-frequency corrections for GPS, Galileo, and BeiDou on L1, L2, and L5, allowing most COTS receivers to achieve better than decimeter accuracy at lower cost than NRTK. Corrections are distributed via NTRIP, making them easy to integrate for robotics, industrial systems, drones, and other autonomous applications. This paper describes the TP | F SSR2OSR system and a test campaign covering over 2,000 miles across three U.S. states. Four COTS receiver models were evaluated in open-sky, suburban, and urban environments. Results include time-series error plots and horizontal error statistics comparing TP | F, a competitor, and uncorrected solutions. Analysis shows consistent sub-decimeter horizontal accuracy and seamless VRS switching across all receiver types with TP | F, confirming the service’s compatibility and cost-effectiveness for large-area, high-precision GNSS applications.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	1212 - 1227
Cite this article:	Wewala, Hakeem, Soliman, Ali, Boda, Aaron, Bellad, Vijaykumar, "Rx Networks High Precision SSR2OSR Service," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 1212-1227. https://doi.org/10.33012/2025.20374
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