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It will be effectively helpful for GPS receiver's design and receiving algorithm research when the realization of GPS signal simulation. GPS 's range code includes coarse/acquisition code (C/A code) and Precise Code (P code), C/A code is used for civilian navigation. On the basis of studying the principle of C/A code signal and its relevance deeply, then simulated C/A code signal and analyzed its relevance by Matlab. The simulation results showed that this method is feasible, so it is really essential to make further research on the GPS signal in real environment based on this simulation platform so as to the receiver can capture and track the satellite signals in the complex environment, then the performance of the satellite receiver will be improved.