@article{Tegedor_Ørpen_Melgard_Lapucha_Visser_2017,
	author = {Tegedor, Javier and Ørpen, Ole and Melgard, T. and Lapucha, Dariusz and Visser, H.},
	title = {G4 Multi-constellation Precise Point Positioning Service for High Accuracy Offshore Navigation},
	journal = {TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation},
	volume = {11},
	number = {3},
	pages = {425-429},
	year = {2017},
	url = {./Article_G4_Multi-constellation_Precise_Tegedor,43,742.html},
	abstract = {Fugro is operating a global GNSS infrastructure for the delivery of high-accuracy multi-constellation Precise Point Positioning (PPP) service, named G4. Precise orbit and clock for all global satellite navigation systems are estimated in real-time and broadcast to the users using geostationary satellites. End-users with a G4-enabled receiver are able to obtain sub-decimeter positioning accuracy in real-time. The system has been tailored for offshore applications where a nearby GNSS station is not always readily available.
G4 offers seamless integration of GPS, GLONASS, Galileo and BeiDou in the navigation solution, therefore allowing the user to obtain a reliable and accurate position even in challenging environments, especially in presence of interference, scintillation or partial sky visibility. In addition, carrier-phase integer-ambiguity resolution (IAR) is supported, for those users requiring the highest possible navigation accuracy.
This paper presents the G4 system architecture and current performance. The benefits of multi-constellation Precise Point Positioning (PPP) are shown in terms of increased availability, robustness and accuracy.},
	doi = {10.12716/1001.11.03.05},
	issn = {2083-6473},
	publisher = {Gdynia Maritime University, Faculty of Navigation},
	keywords = {Global Navigation Satellite System (GNSS), Positioning Accuracy, Offshore Navigation, Precise Point Positioning (PPP), High Accuracy Offshore Navigation, Integer-Ambiguity Resolution (IAR), G4 System Architecture, Multi-Constellation Precise Point Positioning Service}
}