船载时间统一系统GPS跳秒问题研究与改进
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引用本文:毛江锟 ,刘洪源.船载时间统一系统GPS跳秒问题研究与改进[J].计算技术与自动化,2021,(1):58-62
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毛江锟 ,刘洪源 (中国卫星海上测控部江苏 江阴 214400) 
中文摘要:介绍了船载时间统一系统的组成和GPS模块的工作原理。指出了现有时间统一系统存在的GPS跳秒问题。针对船载时间统一系统GPS跳秒问题,建立FTA故障树分析模型,分析故障底事件,定位了GPS跳秒问题的故障部位是GPS定时接收机,并深入分析GPS接收机关于闰秒的相关原理,进一步精确定位了GPS跳秒问题的原因是GPS接收机的闰秒修正软件算法存在缺陷。为了解决该问题,采用在GPS解码程序中增加GPS跳秒检测机制的方法,检测GPS芯片是否发生跳秒现象来避免产生器误同步,从而避免GPS跳秒问题导致的系统时间异常。通过搭建GPS模块程序验证平台和设计GPS验证测试软件进行测试,结果表明改进后的GPS解码程序在检测到GPS定时接收机跳秒后,能使GPS定时接收机复位,并设置GPS信息不可用,避免产生器误同步,从而有效解决了GPS跳秒问题。
中文关键词:船载  时间统一  GPS  跳秒  FTA(故障树分析)  闰秒
 
Research and Improvemen of GPS Jump Second Problem for Timing System on Ship
Abstract:Describes the composition of the ship timing system and the working principle of the GPS module. pointed out the GPS jump second problem of current timing system. For it establishing FTA model and analysis fault bottom events, which positioned the fault location is GPS timing receiver. And analyzed deeply the principle of GPS receiver on the leap second, further pinpoint the reasons is the defect of GPS receiver second correction software algorithm. In order to solve this problem, by means of increasing the GPS jump second detection mechanism in GPS decoding process, which detect jump second phenomenon of GPS chip to avoid the generator false synchronous, and avoid GPS jump second leading to System time anomaly. By setting up the GPS module program verification platform and designing the GPS verification test software for testing. The results show that GPS timing receiver jump second is detected by the improved GPS decoding procedure, which can reset GPS timing receiver, and set the GPS information is not available, to avoid generator false synchronous, so as to effectively solve the GPS problem.
keywords:ship  timing system  GPS  jump second  FTA (fault tree analysis)  leap second
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