The Galileo Signals With Emphasis on L1 OS

The European navigation satellite system Galileo is moving ahead. We describe the open service signal L1 OS transmitted from the satellites. Compared to GPS some new features are introduced: Binary offset carrier modulation, coherent adaptive sub-carrier modulation, pilot signals, and tiered codes. These features make the GPS and Galileo signals live together on the same frequencies, and they make Galileo signals in general more robust