Research On Receiving Of C/A Code And Its FPGA Implementation In High Dynamic GPS Receiver

Global Positioning System (GPS) is a satellite navigation and positioning system with high accuracy developed by U.S. . High dynamic GPS receivers can be applied to missile, satellite, aeroplane, etc. Conventional receivers can not provide accurate navigation information due to the Doppler frequency and variance caused by high dynamic. High dynamic receivers can effectively remove the Doppler frequency so as to improve the navigation and positioning accuracy.Based on analysis of the system architecture, principles and signal characteristics of GPS, in this thesis, author puts emphasis on the acquisition and tracking of C/A code and carrier in high dynamic environment. The author's researches involve three aspects as follows:1.Through theoretical analysis and a lot of simulation experiments, a C/A code acquisition algorithm based on FFT is proposed for high dynamic GPS receiver.2.Based on research on spread-spectrum code and carrier tracking methods, a DLL for code tracking and a carrier tracking scheme are designed. The carrier tracking loop is composed of a CPAFC and a Costas loop. Then parameters are designed after building Matlab simulation models.3.FPGA design and its function simulation of some kernel units in baseband processing block have been achieved.