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GPS Signal-in-Space Integrity Performance Evolution in the Last Decade

机译:最近十年中GPS信号在空间完整性的性能演变

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摘要

Knowledge of the Global Positioning System (GPS) signal-in-space (SIS) anomalies in history has a great importance for not only assessing the general performance of GPS SIS integrity but also validating the fundamental assumption of receiver autonomous integrity monitoring (RAIM): at most one satellite fault at a time. The main purpose of this paper is to screen out all potential SIS anomalies in the last decade by comparing broadcast ephemerides and clocks with precise ones. Validated broadcast navigation messages are generated from 397,044,414 navigation messages logged by on average 410 International GNSS Service (IGS) stations during the period 6/1/2000??8/31/2010. Both IGS and National Geospatial-Intelligence Agency (NGA) precise ephemerides/clocks are used as truth references. Finally, 1256 potential SIS anomalies are screened out. These anomalies show an improving SIS integrity performance in the last decade, from tens or hundreds of anomalies per year before 2003 to on average two anomalies per year after 2008. Moreover, the fundamental assumption of RAIM is valid because never have two SIS anomalies or more occurred simultaneously since 2004.
机译:历史上的全球定位系统(GPS)空间信号(SIS)异常的知识不仅对于评估GPS SIS完整性的总体性能,而且对于验证接收机自主完整性监控(RAIM)的基本假设非常重要:一次最多只有一个卫星故障。本文的主要目的是通过比较广播星历和时钟与精确的星历和时钟来筛选出过去十年中所有潜在的SIS异常。在6/1/2000 ?? 8/31/2010期间,由平均410个国际GNSS服务(IGS)站记录的397,044,414条导航消息生成了经过验证的广播导航消息。 IGS和国家地理空间情报局(NGA)的精确星历/时钟均用作真相参考。最后,筛选出1256个潜在的SIS异常。这些异常显示了过去十年中SIS完整性性能的提高,从2003年之前的每年数十或数百个异常到2008年之后的平均每年两个异常。而且,RAIM的基本假设是有效的,因为从未有两个或更多的SIS异常自2004年以来同时发生。

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