摘要时间统一技术是由导弹、航天试验的需要而发展起来的一门技术，随着现代武器装备、导航、通信、电力等科学技术的进步，越来越多的工程和科学领域需要时间统一。国际标准的IRIG-B格式时间码（简称B码）作为时间同步标准，在靶场测量、控制、通信、气象等设备广泛采用。本课题根据国际通用的IRIG-B格式时间码，并遵照IV型B码终端设计的要求，以Atmel公司的ATmega128单片机作为解调控制单元，Atmel公司的大规模可编程器件ATF1508作为分频链和计数链，辅以必要的模拟电路，设计出B码时统终端。该终端可以解调B码DC码，AC码GPS时间信号，将串行时间信息转化为用户要求的时间序列，并提供系统需要的各种同步信号。此系统同时带有时间源发生器，并且内部带有B码源，将时统终端的时间信息进行调制成AC码和DC码，通过传输信道发回B码时间分站，以供时间分站对终端设备进行修时和控制。关键词：时统终端B码GPSDC码AC码ABSTRACTTimingsystemisanewtechnologyaccompanyingwithrequirementofmissileandspaceflight.Withthedevelopmengofmodernweapons,navigation,communicationandelectricpower,moreandmoreengineeringandscientificfieldsneedtimingunification.InternationalpopularIRIG-Bcodeisusedastimesynchronizationstandard,which,isadoptedindeviceoftestinginshootingrange,contrlling,communicationanweather.ThepaperdiscussesthetimingequipmentaccordingtoformatofIRIG-BcodeandstandardofIVtimingequipment,inwhich,ATmega128singlechipcomputerofAtmelcompanyisusedascontrollingunitofdemodulationanATF1508FPGAisusedascounterchainandfrequencychain.ThetimingequipmentcandemodulateDCcode,ACcodeofIRIG-BandGPStime,andthentransferserialtimetothetypethatrserneedsandgivealsothesynchronizationpulsethatkeepinphasewiththetime.ThetimingequipmenthasthefunctiontogeneratetimeandgenerateIRIG-Bcode,whichissenttobasestationofBcodetoadjusttime.Keywords:TimingEquipmentBCodeGPSDCcodeACcode目录第一章绪论..........................................................................................-0-1.1时间的概念.......................................................................................................................-1-1.2时间统一技术..................................................................................................................-1-1.3论文研究的目的和内容...............................................................................................-3-第二章标准时统设备与IRIG-B码...................................................-5-2.1时统终端............................................................................................................................-5-2.2IRIG-B时间码.................................................................................................................-6-2.3GPS......................................................................................................................................-8-第三章B码时统终端的设计..........................................................-10-3.1总体设计..........................................................................................................................-10-3.2B码时间解调部分的设计........................................................................................-13-3.3B码时间调制部分的设计........................................................................................-19-3.4GPS时间信息的解调.................................................................................................-21-第四章可靠性分析....................................................................
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