Using PPP Information to Implement a Global Real-Time Virtual Network DGNSS Approach

Differential GNSS (DGNSS) has been demonstrated to provide reliable, high-quality range correction information enabling real-time navigation with centimeter sub-meter accuracy, which is required for applications such as connected and autonomous vehicles. However, DGNSS requires a local reference station near each user. For continental or global scale implementation, this dissemination approach would require dense network of stations whose construction maintenance be prohibitively expensive. Precise Point Positioning (PPP) affords more flexibility public service Global Navigation Satellite Systems (GNSS) receivers, but its State Space Representation (SSR) format not supported by most receivers in the field on market. This article proposes novel Virtual Network (VNDGNSS) an optimization algorithm that key implementation. The capitalizes existing PPP infrastructure without need new physical stations. Specifically, no needed vicinity any By connecting SSR data services, VNDGNSS server maintains current about satellite code bias, orbit clock, atmospheric models. Construction Radio Technical Commission Maritime Services (RTCM) Observation (OSR) messages from both signal time-of-transmission position at time are consistent time-of-reception client. presents determine these quantities. Then computes transmits RTCM OSR user receivers. achieves coverage additional base results stationary moving platform evaluations included, using u-blox M8P ZED-F9P performance surpasses Society Automotive Engineering (SAE) specification (68% horizontal error $\leqslant$ 1.5 m vertical 3 m) shows significantly better than Open Service (OS). tests also show receiver Based Augmentation (SBAS) enabled achieve lane-level accuracy (95% errors less 1 m).