多冗余时间服务终端的研制

发布时间：2018-06-13 20:06

本文选题：冗余 + 时间同步　；参考：《中国科学院研究生院（国家授时中心）》2013年硕士论文

【摘要】：时间是物理学的基本参量之一，随着科学技术的发展，高精度的时间和频率在国民经济发展中的地位日趋重要，诸如通信、电力、交通、高速数字网同步等高新技术领域有着广泛的应用，特别是在我国国防建设和空间技术领域[1]，如我国第二代战略武器试验、载人航天工程、深空探测和正在建设中的我国二代卫星导航系统对时间和频率的精度提出了更高的需求。要解决国民经济建设和国防建设对精密时间服务的需求，首先，我们必须有统一的时间标准。其次，我们需要有精确的授时技术。随着授时技术的发展和扩展，定时手段也越来越多，传统系统中定时方式较为单一，不能满足客户对可靠性的需求。因此，多冗余时间源的研究和应用日趋广泛。本文提出了一种多冗余时间服务终端的设计方案，它能够接收多种定时信号，从而实现了利用多冗余时间源实现时间同步，并通过串口、秒脉冲、无线网络等多种接口实现用户时间服务，并具有灵活的人机交互界面。在论文章节安排上，本文首先分析了各种授时方式的优缺点，选择了卫星、CDMA及NTP这三种授时方式作为外部时间源，并通过自动和手动两种方式来实现时间源的冗余，分析了各种定时手段和时间服务方式，规划了时间服务终端的各种功能，，明确了多冗余时间服务终端的设计方案和研究思路。其次，根据系统设计目标和硬件需求，确定采用功能模块化的设计理念，设计完成了多冗余时间服务终端的硬件部分，包括系统硬件设计分析，器件选型，电路原理图的相关介绍，为下一步嵌入式软件的开发奠定了良好的基础。再次，对多冗余时间服务终端的软件需求和功能进行了介绍和分析；设计完成了终端相关的软件；使用C语言和Keil uVision4开发软件进行软件的编写、编译、仿真和实现；完成了各功能模块的程序设计、功能仿真和调试，软硬件联调测试的工作。实验结果表明，本系统能够接收多种时间源(如GPS、北斗、CDMA网络及NTP授时服务器)的时间信息，可为用户终端提供准确实时的时间同步服务，具有一定的工程应用价值，也具有一定的理论研究意义。
[Abstract]:Time is one of the basic parameters of physics. With the development of science and technology, high precision time and frequency are becoming more and more important in the development of national economy, such as communication, electricity, transportation, High-tech fields such as synchronization of high-speed digital networks have been widely used, especially in the fields of national defense construction and space technology in China [1], such as the second-generation strategic weapons test in China, the manned space project, The time and frequency accuracy of the second generation satellite navigation system in deep space exploration and in the process of being built in China has put forward a higher demand. In order to meet the demand of national economy construction and national defense construction for precision time service, first of all, we must have a unified time standard. Second, we need precise timing techniques. With the development and expansion of timing technology, timing methods are more and more, the traditional system timing mode is relatively single, can not meet the needs of customers for reliability. Therefore, the research and application of multiple redundant time sources are becoming more and more extensive. In this paper, a design scheme of multi-redundant time service terminal is proposed, which can receive multiple timing signals, thus realizing time synchronization by using multiple redundant time sources, and using serial port and second pulse. Wireless network and other interfaces realize user time service, and have flexible man-machine interface. In the chapter arrangement, this paper first analyzes the advantages and disadvantages of various timing methods, selects satellite CDMA and NTP as external time sources, and realizes the redundancy of time sources by automatic and manual methods. All kinds of timing methods and time service methods are analyzed, various functions of time service terminal are planned, and the design scheme and research idea of multiple redundant time service terminal are clarified. Secondly, according to the system design objectives and hardware requirements, the design concept of functional modularization is adopted, and the hardware part of the multi-redundancy time service terminal is designed and completed, including system hardware design analysis, device selection. The related introduction of circuit schematic chart lays a good foundation for the next embedded software development. Thirdly, the software requirement and function of multi-redundancy time service terminal are introduced and analyzed, the terminal related software is designed and completed, the software is compiled, simulated and implemented by C language and Keil uVision4. The program design, function simulation and debugging of each function module and the test of hardware and software are completed. The experimental results show that the system can receive time information from many kinds of time sources (such as GPS, BeiDou CDMA network and NTP time server), and can provide accurate and real-time synchronization service for user terminals, and has certain engineering application value. Also has certain theory research significance.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P127.1

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