GNSS信号体制与兼容性的研究

发布时间：2018-03-08 19:14

  本文选题：全球卫星导航系统　切入点：信号体制　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：全球卫星导航系统(Global Navigation Satellite Systems,GNSS)是对全球定位系统(GPS)、格洛纳斯系统(Gloanass)和伽利略系统(Galileo)等单个卫星导航定位系统的统一称谓,也可代指它们的的增强型系统,其成员还包括我国北斗(Bei Dou)导航系统、日本的准天顶系统(QZSS)和印度区域导航系统(IRNSS)等还在开发的卫星导航系统。做为导航系统最为关键的部分,导航信号体制决定了导航系统的先天性能,对系统间的兼容性有着决定性的影响。因此,无论在新系统的建设还是GPS代化过程中,信号体制的设计都是各个GNSS所关注的焦点。由于GNSS的飞速发展,以及国际电信联盟对导航信号带宽的限制,各个导航系统间兼容性的问题也必然存在。兼容性也作为卫星导航系统共存和系统间互操作的前提一直是国际频率协调的重点。本论文分为两个部分:第一部分对GNSS信号体制从频率结构设计、波形设计等出发进行了研究,研究了兼容性评估方法。在此基础上,第二部分从波形上研究了BOC类信号调制方法,对GNSS信号中非恒包络的问题,提出一种对标准Alt BOC改进而来的恒包络信号调制方法,阐述了恒包络产生调制原理,建立时域和频域模型,给出了调制和初步解调方法,并假设运用在北斗B2频段时,分析了其带外损耗、码跟踪能力、抗多径性能、抗干扰性能和兼容性。本论文的主要研究内容和贡献如下:对GPS、Galileo和北斗信号体制进行了分析,从从信号多址选择、频率规划、伪码、信号波形和导频信号角度分析总结了信号体制设计思想,研究了GNSS信号兼容性分析方法,详细分析了BOC调制、恒包络Alt BOC调制和TD-Alt BOC调制原理,为北斗导航信号体制的建设和新型导航信号的建立奠定了基础。建立了新型恒包络PS-Alt BOC信号的时域模型和功率谱密度模型,解决了信号的非恒包络问题,分析了PS-Alt BOC调制的带外损耗性、码跟踪性能、抗多径性能、抗干扰性能。并假设用于北斗B2频段时与同频段的其他GNSS系统的兼容性。分析结果为北斗系统设计新型信号调制的可行性提供了理论支撑。
[Abstract]:The Global Navigation Satellite Systems GNSS is a unified term for single satellite navigation and positioning systems such as GPS, Gloanassand Galileo, and may also refer to their enhanced systems. Its members also include satellite navigation systems still under development, such as the Bei Doui navigation system, the quasi-zenith system in Japan, and the Indian regional navigation system, IRNSS. as the most critical part of the navigation system, Navigation signal system determines the innate performance of navigation system and has a decisive effect on the compatibility between systems. The design of signal system is the focus of all GNSS. Due to the rapid development of GNSS and the limitation of the bandwidth of navigation signal by the International Telecommunication Union, Compatibility among navigation systems must also exist. Compatibility is always the focus of international frequency coordination as the premise of coexistence and interoperation of satellite navigation systems. This paper is divided into two parts: the first part. The design of GNSS signal system from frequency structure, Based on the research of waveform design, the compatibility evaluation method is studied. In the second part, the modulation method of BOC signal is studied from the waveform, and the problem of non-constant envelope of GNSS signal is discussed. An improved modulation method for constant envelope signal based on standard Alt BOC is proposed. The modulation principle of constant envelope generation is expounded, the time-domain and frequency-domain models are established, the modulation and preliminary demodulation methods are given, and the method is assumed to be applied in Beidou B2 band. Its out-of-band loss, code tracking ability, anti-multipath performance, anti-jamming performance and compatibility are analyzed. The main research contents and contributions of this paper are as follows: the analysis of GPS Galileo and Beidou signal system, from the signal multiple access selection, frequency planning, Pseudo-code, signal waveform and pilot signal angle analysis, the design idea of signal system is summarized, the compatibility analysis method of GNSS signal is studied, and the principles of BOC modulation, Alt BOC modulation and TD-Alt BOC modulation are analyzed in detail. It lays a foundation for the construction of Beidou navigation signal system and the establishment of new navigation signal. The time-domain model and power spectral density model of a new type of constant envelope PS-Alt BOC signal are established, and the non-constant envelope problem of the signal is solved. The out-of-band loss, code tracking and anti-multipath performance of PS-Alt BOC modulation are analyzed. The anti-jamming performance and compatibility between Beidou B2 band and other GNSS systems with the same frequency band are assumed. The results provide theoretical support for the feasibility of Beidou system to design new signal modulation.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1
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本文编号：1585191