Design And Implement Of The GPS Signal And Interference Simulation System

Nowadays, Satellite Navigationg and Position System is playing a more and more important role in all fields. Besides the military field, Global Position System has been used widely in many files including economics and science experiments.Based on"GPS STAP Anti-jamming Receiver"project, this thesis focuses on design and implement of the GPS signal and interference simulation system, provides simulation scene of signal and interference to"GPS STAP Anti-jamming Receiver".Accroding to the Design of the GPS signal and interference simulation system, this thesis discusses the generation of GPS receiver signal in principle, judgement method in real-time to the satellite which can been seen by receiver, analysis and generation of GPS signal and interference, simulation of doppler frequency shift of GPS signal and simulation of Unitary Circle Array(UCA) receiving GPS signals and interference. Secondly, this thesis studies on the Matlab simulation method and step of the GPS signal and interference, realizes the Matlab simulation of GPS single satelite signal and multiple satelite signals, realizes the Matlab simulation of gaussian white noise and several popular types of interference, realizes the Matlab simulation of the doppler frequency shift, realizes the Matlab simulation of UCA receiving signals / interferences. Finally, according to requirements and principles of simulation system, the VHDL programs for FPGA are designed to realize the simulation output of C/A code and interference, the AD9957 are controlled to operates in QDUC mode by FPGA VHDL programing. Through the hardware circuit debugging,the hardware platform outputs the GPS signal, gaussian white noise and Interfere signal.