导航高精度时频基准源生成技术研究

发布时间：2018-06-13 17:53

本文选题：导航卫星 + 时频基准　；参考：《复旦大学》2014年硕士论文

【摘要】：精确的导航主要依赖于精确的时间。在导航卫星系统中,精确位置的测量实际上是精确时间的测量,而精确的时间来自于精确的时频基准信号。高精度的卫星时频基准信号是整个卫星导航系统实现导航定位、授时和测速的基础。研究高精度的导航时频基准源生成技术,是各个国家基础研究的重点方向,对国家建设和发展意义重大。本文第一部分,介绍国内外导航卫星时频基准设备的研究发展现状,给出相关实现方法和技术指标。并在前人研究的基础上,梳理出下一代高性能导航定位系统时频基准设备的技术发展趋势。第二部分分析了时频信号的准确度、频率稳定度等关键技术指标,并给出相关指标的相互转化关系。在此基础上,研究基于数字锁相环DPLL和直接数字频率合成DDS相混合的导航高精度时频基准源生成技术,仿真产生高精度、高稳定度、低相噪和低杂散的基准信号,并分析其性能。作为原理样机设计的理论基础。第三部分是根据系统的功能和指标要求,提出一种可行的高精度时频基准源原理样机实现方案,将铷原子钟输出10MHz参考信号转换为高可靠、高精度、稳定并且连续的10.23MHz导航卫星时频基准信号,并进行软硬件实现。最后,针对原理样机的关键技术指标,进行测试验证,给出具体测试结果。
[Abstract]:Accurate navigation depends mainly on precise time. In the navigation satellite system, the accurate position measurement is actually the accurate time measurement, but the accurate time comes from the accurate time frequency reference signal. High precision satellite time frequency reference signal is the basis of the whole satellite navigation system to realize navigation positioning, timing and velocity measurement. The research of high-precision time-frequency reference source generation technology is the key direction of basic research in each country, and it is of great significance to national construction and development. In the first part of this paper, the research and development of navigation satellite time-frequency reference equipment at home and abroad are introduced, and the relevant implementation methods and technical specifications are given. On the basis of previous studies, the technical development trend of the next generation high performance navigation and positioning system time-frequency reference equipment is sorted out. In the second part, the key technical indexes, such as accuracy and frequency stability of time-frequency signal, are analyzed, and the relationship between relative indexes is given. On this basis, the high precision time-frequency reference source generation technology based on DPLL and DDS is studied, which can generate high precision, high stability, low phase noise and low spurious reference signal. Its performance is analyzed. As the theoretical basis of prototype design. In the third part, according to the function and index requirement of the system, a feasible prototype of time-frequency reference source with high precision is proposed. The output 10MHz reference signal of rubidium clock is converted into high reliability and high precision. Stable and continuous 10.23 MHz navigation satellite time frequency reference signal, and software and hardware implementation. Finally, the key technical indexes of the principle prototype are tested and verified, and the concrete test results are given.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1

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