Laurent Lestarquit and his international team designed and patented two primary signal innovations for the European GALILEO global navigation satellite system (GNSS). Their signalling technology helps ensure the high accuracy of GALILEO, while saving energy and assuring navigational compatibility and/or interoperability with the US GPS and the Russian GLONASS worldwide GNSS systems. The team’s developments also allow the use of legacy and lower end receivers along with the latest high-end satellite navigational devices.