發(fā)布時間：2018-06-13 20:06

  本文選題：冗余 + 時間同步��； 參考：《中國科學院研究生院（國家授時中心）》2013年碩士論文

【摘要】：時間是物理學的基本參量之一，隨著科學技術(shù)的發(fā)展，高精度的時間和頻率在國民經(jīng)濟發(fā)展中的地位日趨重要，諸如通信、電力、交通、高速數(shù)字網(wǎng)同步等高新技術(shù)領域有著廣泛的應用，特別是在我國國防建設和空間技術(shù)領域[1]，如我國第二代戰(zhàn)略武器試驗、載人航天工程、深空探測和正在建設中的我國二代衛(wèi)星導航系統(tǒng)對時間和頻率的精度提出了更高的需求。 要解決國民經(jīng)濟建設和國防建設對精密時間服務的需求，首先，我們必須有統(tǒng)一的時間標準。其次，我們需要有精確的授時技術(shù)。 隨著授時技術(shù)的發(fā)展和擴展，定時手段也越來越多，傳統(tǒng)系統(tǒng)中定時方式較為單一，不能滿足客戶對可靠性的需求。因此，多冗余時間源的研究和應用日趨廣泛。 本文提出了一種多冗余時間服務終端的設計方案，它能夠接收多種定時信號，從而實現(xiàn)了利用多冗余時間源實現(xiàn)時間同步，并通過串口、秒脈沖、無線網(wǎng)絡等多種接口實現(xiàn)用戶時間服務，并具有靈活的人機交互界面。 在論文章節(jié)安排上，本文首先分析了各種授時方式的優(yōu)缺點，選擇了衛(wèi)星、CDMA及NTP這三種授時方式作為外部時間源，并通過自動和手動兩種方式來實現(xiàn)時間源的冗余，分析了各種定時手段和時間服務方式，規(guī)劃了時間服務終端的各種功能，，明確了多冗余時間服務終端的設計方案和研究思路。 其次，根據(jù)系統(tǒng)設計目標和硬件需求，確定采用功能模塊化的設計理念，設計完成了多冗余時間服務終端的硬件部分，包括系統(tǒng)硬件設計分析，器件選型，電路原理圖的相關介紹，為下一步嵌入式軟件的開發(fā)奠定了良好的基礎。 再次，對多冗余時間服務終端的軟件需求和功能進行了介紹和分析；設計完成了終端相關的軟件；使用C語言和Keil uVision4開發(fā)軟件進行軟件的編寫、編譯、仿真和實現(xiàn)；完成了各功能模塊的程序設計、功能仿真和調(diào)試，軟硬件聯(lián)調(diào)測試的工作。 實驗結(jié)果表明，本系統(tǒng)能夠接收多種時間源(如GPS、北斗、CDMA網(wǎng)絡及NTP授時服務器)的時間信息，可為用戶終端提供準確實時的時間同步服務，具有一定的工程應用價值，也具有一定的理論研究意義。
[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.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P127.1

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本文編號：2015253