【正文】 / h while RLGs are limited in practice to103 deg/ h [18]. In addition, as we have already seen, a FOG has no quantification noise.Due to its inherent low random noise and its scalability the FOG technology is one of the very few technologies able to cope with the applications requiring the highest performance [14].Over the past few years the American Government has sponsored a $100m dollar research project to develop high performance FOGs for use in SSBN [4].The FOG technology is seen by US experts as the only technology in the future able to replace the mechanical gyroscopes used for SSBN [8].IXSea FOGbased inertial navigation system MARINS has been chosen by the UK Navy as the main navigation reference for ASTUTEclass submarines [21].IXSea FOG technology has been chosen by the French space agency (CNES) for high performance Earthobservation Pl233。iades satellites [23].Figure 2 MARINS highperformance inertial navigation system chosenby the UK Navy for ASTUTEclass submarines ITAR free – Full mastery of technologyThe development of FOG technology at iXSea started 25 years ago (at that time the pany was called Photonetics). Since then, iXSea has been granted several key patents on the design of high performance FOGs, and iXSea has progressively fully integrated the design and manufacturing process of FOGs. Today iXSea directly controls the full chain of key technological FOG ponents from the manufacturing of the fiber (iXFiber), to coil winding and the optical integration of ponents.IXSea FOG technology has been chosen by the European Space Agency (ESA) as the European ITARfree technology for high performance applications [22].Figure 3 –FOG fiber manufacturing at iXFiber ProvenFOG is a proven technology used all over the world for applications with the most severe requirements.More than 2,000 FOGbased inertial systems (6,000 FOGs) manufactured by iXSea are in operation all over the world for all kind of applications from Offshore operation at 3,000m depth to Space applications, going through defense applications and land survey applications,… ([3], [5], [6], [7],[10], [12], [13], [15])Figure 4 NEXTER 105 GUN equipped with iXSea inertial navigation systemAn analysis based on more than 1,000 iXSea systems on the field (cumulating 2,500 years on the field) has shown that iXSea FOG triads (three FOGs integrated to be used inside an inertial navigation system) have an MTBF of more than 500,000 h (60 years)1 [17].Litton, a subsidiary of Northrop Grumman and a petitor of iXSea, has sold more than 20,000 LN200 FOGbased guidance systems for missile applications [20].IXSea FOGbased Inertial Navigation Systems are used all over the world by more than 20 navies.4 ConclusionFOG is today a proven technology and the best choice for highperformance applications. Over the years, iXSea FOGbased systems have been used all over the world for the most demanding applications, ensuring its users the best performance and the lowest maintenance cost.At iXSea we work continuously to keep our FOG technology and FOGbased systems such as MARINS at the highest level among all peting technologies and systems.We hope that with our technology and systems, our customers will continue to be able to reduce their costs of ownership, benefiting from the low maintenance and extend their operational possibilities using the high performance of our systems over time.5 References[1] The FiberOptic Gyroscope, H. Lef232。vre, Artech House, BostonLondon, 1993[2] Fundamentals of the Interferometric Fiber Optic Gyroscopes, H. Lef232。vre, Optical Review , 1A (1997) pp 2027[3] Highly Compact Gyropass for Applications at depth up to 3000m, T. Gaiffe et al. Underwater Intervention, Int. Conference, New Orleans USA, 2000[4] Navy and industry investigate new superaccurate optical gyros for possible use on ballistic missile submarines, Military amp。 Aerospace Electronics, 2001[5] PHINS: the first high performance inertial navigation system based on fiber optic gyroscopes,F. Napolitano and al., St Petersburg Int. Conference on Navigation System, 2002[6] PHINS Photonic Integrated Navigation system, F. Napolitano et al., Symposium Gyro Technology, Stuttgart, Germany, 2002[7] Very High Performance FOG for Space use, E. Willemenot et al., Symposium Gyro Technology, Stuttgart, Germany, joint paper EADSASTRIUM amp。 IXSEA, 2002[8] ASTRIX200 – A Very High Performance FOG Inertial Measurement Unit for Accuracy demanding Satellites, EADSASTRIUM amp。 IXSEA, 2002[9] INS/GPS Technology Trends George T. Schmidt The Charles Stark Draper Laboratory, 2003[10] The SOFIA program: astronomers return to the stratosphere, Advances in Space Research, Sean C. Casey, Volume 34, Issue 3, Astronomy at IR/Submm and the Microwave Background, 2004, Pages 560567.[11] FOG Technology and FOG based systems: an industrial reality at IXSEA, Y. Paturel et al., Saint Petersburg International Conference on Integrated Navigation Systems, 2004[12] MARINS, the first FOG navigation system for submarines, Y. Paturel et al., Symposium Gyro Technology, Stuttgart, Germany, 2006 [13] MARINS, the new high performance navigation system for submarines, Y. Paturel et al., Underwater Defense Technology, 2006[14] High Performance FOG: one design, no limit yet!?, J. Honthaas et al., Optical Fiber Sensors 18 Canc249。n, October 2006[15] In flight measurement of INS attitude and heading accuracy (LOLA project), Y. Paturel et al. ,Symposium Gyro Technology, Karlsruhe, Germany, 2007.[16] Recent investigations on FOG technology under Vibration, the way forward Inertial NavigationSystems, J. Honthaas et al. , Symposium Gyro Technology, Karlsruhe, Germany, 2008.[17] Analyse de la fiabilit233。 des syst232。mes inertiels IXSEA, F. Napolitano, 2009 [Internal Document][18] Les gyrom232。tres optiques: le gyrolaser et le gyrofibre, H. Lef232。vre, extract from the book 50 years of laser, 2010[19] Planck Space