Abstract: Considering the new spread spectrum technology, the new signal modulation system and the frequency sharing characteristic, the synchronization method of single purpose haven't meet the need. Based on the studying of signal mechanism and characteristic of the L1 and L5 frequency signals in GPS and Galileo system, the control technology and data process method were weighty studied, the channels, accumulate time and process method were rationally choiced. Therefore, the purpose of multi mode signals receiving and synchronization was gained,furthermore the simulation and performance test were implemented, providing the feasibility, rationality and validity of the method.

Key words: Multi mode signals, Ll , L5 , Synchronization, Simulation