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The Development of the Multiple Redundant Time Service Terminal

Author: BaiShanShan
Tutor: HuYongHui
School: Graduate School , Chinese Academy of Sciences ( National Time Service Center )
Course: Electronics and Communication Engineering
Keywords: Redundance Time Synchronization NTP Wi-Fi CDMA
CLC: P127.1
Type: Master's thesis
Year: 2013
Downloads: 13
Quote: 0
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Abstract


Time is one of the basic parameters of physics. With the development ofscience and technology, time and frequency of high precision has become more andmore important in the development of national economic, especially in high-techfields, such as communication, electric power, transportation, and high-speed digitalnetwork synchronization. It plays an important role in national defense constructionand space technology, such as the second generation of strategic weapons test in ourcountry, the manned space engineering, deep space exploration, and the secondgeneration satellite navigation system in constructing.All these technology have putforward higher requirements on the precision of time and frequency.To solve the demand of national economic construction and national defenseconstruction for the precision of time service, we must have a uniform time standardfirstly. And then, we need a precise timing technology.With the development of timing technology and extension, more and moretiming means have emerged. Means of single timing in the traditional system is lackof reliability, and it can’t meet the customer’s needs. So research and application inthe multi-redundant time source is getting broader and broader daily.This thesis presents a design of the multi-redundant terminal, which can receivea variety of timing signal so as to achieve time synchronization with multipleredundant time source and deliver to the user through a variety of interfaces, such aswireless network, serial port and second pulse. This design also has a flexible humaninteraction interface.On the thesis chapters arrangement, firstly, this thesis analyzes the advantagesand disadvantages of various timing mode, and then chooses three timing mode: thesatellite, CDMA and NTP as external time sources. To achieve time sourceredundancy, both automatic and manual way can be used. Various timing means andtime service are analyzed, functions of time service terminal are planned, andresearch ideas of redundant service terminal are well known.Secondly, according to the system design goals and hardware requirements, thefunctional modular design concept is determined. The design of the hardware part ofredundant terminal is completed, including system hardware design, device selectionand circuit diagram. Thirdly, multiple redundant service terminal software requirements andcapabilities are introduced and analyzed and the relevant software of the terminal isdesigned and completed. With the technology of C language and Keil uVision4, thesoftware is written and compiled. Programming, simulation and debugging of eachfunctional module are completed. The debugging and testing work of hardware andsoftware are also accomplished.The experimental results show that the system is able to receive timeinformation from a variety of time source (such as GPS, BD, CDMA network andNTP timing servers). Real-time and accurate time synchronization service can beprovided for the user terminal. The system will have an instructive meaning forengineering applications, and is of vital theoretical significance too.

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CLC: > Astronomy,Earth Sciences > Astronomy > Astrometry > Timing, the change of latitude and longitude > Time service
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