NovAtel CORRECT with Precise Point Positioning (PPP): Recent Developments

Altti Jokinen, Cameron Ellum, Iain Webster, Surendran Shanmugam and Kevin Sheridan

Abstract:	For several years now, there has been an increasing focus on high accuracy (sub-decimeter) Precise Point Positioning (PPP). Long initial convergence times that were historically a barrier to adoption have improved, and the prevalence of PPP as a tool for positioning has correspondingly increased in both traditional and new markets needing centimeter level accuracy. Hexagon Positioning Intelligence (HPI) has recently released a new real-time PPP service that significantly improves convergence on a global basis through the addition of Galileo, BeiDou, and QZSS corrections to the existing GPS and GLONASS-only TerraStar-C service. TerraStar is ready to take full advantage as the newer constellations reach completion and maturity. The new service also introduces advancements in client-side algorithms. The improvements from both the additional signals and the client-side changes lower the time to 5 cm 95th-percentile convergence by as much as 50%. To reduce convergence times and improve the customer experience even further, regional ionosphere corrections are used to provide nearly immediate convergence to sub-decimeter level. HPI is actively testing regional ionosphere models (RIM) in North America and Europe. Results from these tests show that convergence to a 5-cm level can be obtained in several seconds. An additional benefit of RIM is significantly faster convergence and higher reliability even in challenging kinematic environments, where frequent signal blockages occur and the magnitude of multipath is large. Having RIM compensates for performance degradation caused by multipath. To be confident in the performance of a global service, system performance metrics must be analyzed globally. Accordingly, performance is demonstrated using data and results from HPI’s Global Monitoring System (GMS) which enables analysis by using many, widely-distributed reference stations. In summary, we highlight a number of HPI’s latest advances in high accuracy PPP and as this performance capability becomes more widely available, the greater will be the applications and benefit to end users.
Published in:	Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018) September 24 - 28, 2018 Hyatt Regency Miami Miami, Florida
Pages:	1866 - 1882
Cite this article:	Jokinen, Altti, Ellum, Cameron, Webster, Iain, Shanmugam, Surendran, Sheridan, Kevin, "NovAtel CORRECT with Precise Point Positioning (PPP): Recent Developments," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 1866-1882. https://doi.org/10.33012/2018.15824
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