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WAAS Network Time Performance with Site Data

机译：WAAS网络时间性能与站点数据

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Raytheon Systems Company is currently designing the algorithms of the FAA's Wide Area Augmentation System (WAAS). This paper will briefly overview the WAAS network time (WNT) algorithms and their integration into the overall system.rnThe WAAS system is required to provide users with orbit, clock, and ionosphere corrections for single-frequency measurements of the GPS signal. The clock corrections will be made in the WAAS network time (WNT) reference scale. This reference scale is required to track the GPS time scale, while at the same time providing the users with the translation to UTC. Other internal requirements are placed on the WNT bias and frequency jumps from the accuracy demanded in the WAAS fast corrections.rnThe WAAS architecture requires that WNT be computed at multiple WAAS master stations (WMS) using potentially differing sets of measurements from potentially differing sets of receivers and clocks. This design must provide the user a seamless transition when switching from one WMS's WNT realization to another.rnThis paper expands on a previous paper presented at ION GPS-97 [Pe2] using simulated clock data as input. We have also included some sections from [Pe2] in this paper for completeness. Here, we will present the performance and validation results of the WNT algorithm using real GPS clock and receiver data from the National Satellite Testbed (NSTB). We will also give a sneak preview of the algorithm performance using the more precise WAAS receiver clock data, indicating that the WNT design should meet the aforementioned requirements, taking into account possible WMS switches.rnTwo tests are performed. Using two different subsets (simulating WMS networks) taken from the NSTB sites, we demonstrate that coordinated WNT as computed at the two different networks closely agree (on WNT), thereby ensuring a seamless transition from one WMS network to another. Next, we test how well WNT for a single WMS network agrees with GPS time.
机译：雷神系统公司目前正在设计FAA广域增强系统（WAAS）的算法。本文将简要概述WAAS网络时间（WNT）算法及其在整个系统中的集成。要求WAAS系统为用户提供用于GPS信号单频测量的轨道，时钟和电离层校正。时钟校正将以WAAS网络时间（WNT）参考标准进行。需要该参考比例尺来跟踪GPS时间标尺，同时为用户提供到UTC的转换。其他内部要求也针对WNT偏置和WAAS快速校正所需精度的跳频问题。WAAS体系结构要求使用多个可能来自不同接收器的测量集在多个WAAS主站（WMS）上计算WNT。和时钟。从一种WMS的WNT实现切换到另一种WMS实现时，这种设计必须为用户提供无缝的过渡。本文扩展了在ION GPS-97 [Pe2]上发表的论文，其中使用了模拟时钟数据作为输入。为了完整起见，我们还包括了[Pe2]中的某些部分。在这里，我们将使用国家卫星测试台（NSTB）的真实GPS时钟和接收器数据介绍WNT算法的性能和验证结果。我们还将使用更精确的WAAS接收器时钟数据简要预览算法性能，这表明WNT设计应满足上述要求，并考虑到可能的WMS开关。进行了两次测试。使用从NSTB站点获取的两个不同子集（模拟WMS网络），我们证明了在两个不同网络上计算出的协调WNT非常一致（在WNT上），从而确保了从一个WMS网络到另一个WMS网络的无缝过渡。接下来，我们测试单个WMS网络的WNT与GPS时间的吻合度。

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