| The satellite navigation system is the high precise aviation system, which wouldrealize global, all-weather, real-time, continuous navigation and positioning. The newgeneration signals are applied gradually in the satellite navigation system, in order tomeet the need on the performance of anti-jamming, expansibility and adaptability.Correspondingly, it becomes a hot problem that the research of synchronization methodsand the anti-jamming performance on the new modulation signals, the new spreadfrequency spectrum signals, and the new frequency band signals. In the dissertation, onthe foundation of analyzing new modulation methods, the research is done thoroughly,which lay on emphasis on the new synchronization methods and the anti-jammingperformance of new navigation signals.Firstly, the composition of satellite navigation systems, the location theory,pseudo-range calculations and the main modulation are briefly described, and thesimilarities and differences of the BOC modulation and PSK modulation are analyzedand compared. Secondly, on the foundation of analyzing the BOC signal spectrum andautocorrelation function, an acquiring method is studied. According to the problem ofsending and receiving of BOC modulation subcarrier phase out of sync, an improvedcode phase acquisition based on the parallel approach is presented, and the orthogonalIQ acquisition algorithm is designed. Simulation result shows that the acquisitionperformance is better than the classic capturing method. Third, in response to thetracking loops, the anti-jamming performance of BOC signals in typical jammingenvironments is analyzed. And then, according to the difficulty of satellite navigationsignal acquisition processing which is caused by the new modulation technology, amethod of De-illegibility Search based on TDDM-BOC signal is provided. On thefoundation of systematically analyzing existing methods, the design method caneffectively achieve the pseudo-code acquisition and carrier capture. Finally, the researchwork is summarized, and the further research direction is given. |
