Design and Implementation of GPS/BD2/GALILEO Multi-Navigation System based on Compatibility Analysis

The key technologies of multi-system integrated GNSS-R receiver is discussed.The method of multi-system GNSS-R receivers is introduced,based on the platform of FPGA and DSP.Kinds of technologies,such as data extraction and interpolation,stored C/A code,the phase of CA code and the Doppler of carrier with FFT are searched,and segment correlation and FFT to acquire a serial cross-correlation power of reflected signal and local CA code is used,etc.which the multi-system compatibility problem in sampling、acquisition、tracking、processing and so on are solved,and a verification system to implement this system is constructed.