【作者】 杨伟；

【导师】 朱畅华；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2012， 硕士

【摘要】 卫星导航系统是实现全球全天候实时连续导航定位的高精度导航系统为了满足系统抗干扰可扩展和可用性等方面的要求，卫星导航系统相继提出或使用了新一代信号相应的，对新的调制方式扩频方式卫星信号同步方法以及抗干扰性能的研究成为热点问题本论文在分析了新一代调制方式的基础上，重点对导航信号的同步方法以及抗干扰性能进行研究本文首先简单介绍了卫星导航系统的组成定位原理伪距计算和主要的调制方式，并分析比较了PSK调制和BOC调制的异同；其次，在分析BOC信号的频谱和自相关函数的基础上，研究了其捕获方法，针对BOC调制收发端副载波相位不同步的问题，改进了基于并行码相位捕获的方法，设计了正交IQ捕获算法，对两路并行捕获，捕获性能优于经典的捕获方法；第三，针对提出的跟踪环路，研究和仿真了BOC信号在典型干扰环境下的抗干扰性能；第四，针对TDDM-BOC调制技术信号捕获难的问题，在系统分析现有方法特点的基础上，介绍了解模糊位搜索法，可以有效实现伪码捕获及载波捕获；最后，对全文进行总结，并指出进一步的研究方向更多还原

【Abstract】 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.更多还原