The Research Of The Key Technologies In The High Dynamic GPS Satellite Signal Simulator

This dissertation focuses on the key technologies in the development of the high dynamic GPS satellite signal simulator. It contains four chapters:In the first chapter, the background and significance of developing the high dynamic GPS satellite signal simulator are presented.In the second chapter, the architecture and principle of the high dynamic GPS Satellite signal simulator are presented first. And then a method for generating the digital intermediate frequency signal of a single satellite is introduced which meets the high dynamic requirements. At last, an architecture of generating the 24-channel GPS digital intermediate frequency signal is presented which has the optimal channel consistency.In the third chapter, the carrier number controlled oscillator is studied in details. First its fundamental theory is introduced, then the phase truncation error and amplitude quantization error are analyzed, together with their influences on the spectrum of the output signal, and then a formula is presented to evaluate the influences which corresponds with the simulating results.Then two methods are introduced to suppress the spurs, together with their implementing architecture, which are proved to be practical according to the simulating results. At last the principle of choosing parameters for carrier number controlled oscillator is introduced.In the last chapter, the code number controlled oscillator is studied in details. First its fundamental theory is introduced, then the performances of the two methods are analyzed. Also the reason for phase dither is analyzed, and then the value of phase dither is calculated. After that the problems of sampling and signal accuracy are analyzed which are caused by phase dither, and a clew is introduced to solve these problems. At last the principle of choosing parameters for code number controlled oscillator is introduced.