Research Of Carrier Synchronization System Base On AR Model Bispectrum Estimation

With the developing of the information industry, the demand on satellite communication is strict. Carrier synchronization in low SNR and high dynamic condition is the foundation for the satellite communication. The technology of Carrier synchronization is combined by the carrier capture and tracking. This paper analyzes and compares the internal and external researches of carrier synchronization, and researches the problem from a new point of view.Firstly, by establishing the line-of-sight range model and simulation, this paper find the Doppler frequency shift's and frequency offset the rate's trend of the high dynamic signal, as well as design parameters of system requirements.Secondly, based on reseaching of the traditional carrier synchronization technology, this paper designs a new system, according to the parameters. The AR model bispectrum estimation is intruducted in the design, using its own suppression on the Gaussian noise to enhance the carrier capture module's anti-noise performance. A carrier tracking module which combinated by AFC and Costas loop is designed. By increasing the time-domain extraction unit, the carrier tracking module's anti-noise performance is improved. The components and overall system is simulated in MATLAB. The system is proved to be able to actualize carrier synchronization at low SNR and high dynamic conditions.Finally, by setting the sub-channel carrier capturing measures and variable bandwidth variable extraction rate carrier tracking measures, it further improve the system's anti-noise performance to meet the deep space communications at the same bandwidth. By MATLAB simulation proved that the improved system can implement carrier synchronization at lower signal to noise ratio condition.