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GPS SPS Performance in 2012 - How Good Was It?

机译:2012年GPS SPS的效果-效果如何?

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The 2008 Standard Positioning Service PerformanceStandard provides the U.S. government's assertions re-garding the expected performance of GPS. The SPSPS denes SPS as that service delivered through theL1 C/A code signal; the only GNSS civil signal forwhich such a specication exists. As such, the SPSPS is relevant to developing GNSS signals because itmay serve as a model for any future performance spec-ications for other GNSS signals. Therefore, it is im-portant to test the SPS PS assertions and verify boththe usefulness of the metrics and the quality of servicebeing delivered.We characterize the performance of GPS for 2012 interms of the SPS PS and compare this performancewith that of recent years. Our analysis addresses met-rics that are stated in terms of performance to be ex-pected by a single-frequency user, and our emphasiswill be on those assertions which can be veried byanyone with knowledge of standard GPS data analysispractices, familiarity with the relevant signal speci-cation, and access to a data archive.The observation data used in the analysis con-sists of observation data collected from the NationalGeospatial-Intelligence Agency (NGA) GPS monitorstation network and from a subset of the Interna-tional GNSS Service (IGS) network. To determinesatellite positions we use both an archive of broad-cast ephemeris data, and the NGA precise ephemerisproduct. The analysis tools used are either part of,or built from, the open-source GPS Toolkit (GPSTk)project.The SPS PS assertions evaluated will include those as-sociated with the accuracy, continuity, availability ofthe GPS signal-in-space (SIS), and the position perfor-mance standards (through the position dilution of pre-cision). We will describe the various metrics and theconditions that apply to them, our method of anal-ysis, and the overall results of the analysis. We willprovide examples of some of the intricacies involved inevaluating the SPS PS metrics.Our analysis conrms that the GPS met the SPS PS performance metrics during 2012.
机译:2008年标准定位服务绩效 标准提供了美国政府的主张, 达到了GPS预期的性能。 SPS PS将SPS定义为通过 L1 C / A代码信号;唯一的GNSS民用信号 存在这样的规范因此,SPS PS与开发GNSS信号有关,因为它 可以作为未来任何性能规格的模型- 其他GNSS信号的信号。因此,这是 重要的是测试SPS PS断言并验证两者 指标的实用性和服务质量 正在交付。 我们表征了2012年GPS的性能 SPS PS的条款,并比较此性能 与最近几年一样。我们的分析解决了以下问题: 根据性能说明的rics 受到单频用户的关注,我们的重点是 将取决于那些可以被以下方面断言的断言 具备标准GPS数据分析知识的任何人 实践,熟悉相关信号规范 阳离子,并访问数据存档。 分析中使用的观测数据 从国家气象局收集的观测数据 地理空间情报局(NGA)GPS监视器 站网络和国际互联网的子集 常规GNSS服务(IGS)网络。确定 卫星位置我们既使用广泛的档案 转换星历数据,以及NGA精确星历 产品。所使用的分析工具是 或由开源GPS工具包(GPSTk)构建 项目。 评估的SPS PS断言将包括以下内容: 与准确性,连续性,可用性相关 GPS空间信号(SIS)和位置性能- 执行标准(通过预先稀释位置 切割)。我们将描述各种指标以及 适用于他们的条件,我们的肛门方法- ysis,以及分析的总体结果。我们将 提供一些涉及到的复杂性的例子 评估SPS PS指标。 我们的分析认为,2012年GPS达到了SPS PS性能指标。

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