The Galileo high accuracy service (HAS) is a new capability of the European global navigation satellite system, currently providing satellite orbit and clock corrections and dispersive effects such as satellite instrumental biases for code and phase. In its full capability, Galileo HAS will also correct the ionospheric delay on a continental scale (initially over Europe). We analyze a real-time ionospheric correction system based on the fast precise point positioning (F-PPP), and its potential application to the Galileo HAS. The F-PPP ionospheric model is assessed through a 281-day campaign, confirming previously reported results, where the proof of concept was introduced. We introduce a novel real-time test that directly links the instantaneous position error with the error of the ionospheric corrections, a key point for a HAS. The test involved 15 GNSS receivers in Europe acting as user receivers at various latitudes, with distances to the nearest reference receivers ranging from tens to four hundred kilometers. In the position domain, the test results show that the 95th percentile of the instantaneous position error depends on the user-receiver distance, as expected, ranging in the horizontal and vertical components from 10 to 30 cm and from 20 to 50 cm, respectively. These figures not only meet Galileo HAS requirements but outperform them by achieving instantaneous positioning. Additionally, it is shown that formal errors of the ionospheric corrections, which are also transmitted, are typically at the decimeter level (1 sigma), protecting users against erroneous position by weighting its measurements in the navigation filter.

伽利略高精度服务（HAS）是欧洲全球导航卫星系统的一项新功能，目前提供卫星轨道和时钟校正以及色散效应，例如代码和相位的卫星仪器偏差。伽利略 HAS 还将在其全部能力范围内纠正大陆范围内的电离层延迟（最初在欧洲上空）。我们分析了基于快速精确单点定位（F-PPP）的实时电离层校正系统及其在伽利略 HAS 中的潜在应用。 F-PPP 电离层模型通过为期 281 天的活动进行评估，证实了之前报告的结果，其中引入了概念验证。我们引入了一种新颖的实时测试，它将瞬时位置误差与电离层校正误差直接联系起来，这是 HAS 的关键点。此次测试涉及欧洲的 15 个 GNSS 接收器，它们在不同纬度充当用户接收器，与最近的参考接收器的距离从数十到四百公里不等。在位置域中，测试结果表明，瞬时位置误差的第 95 个百分位数取决于用户与接收器的距离，正如预期的那样，水平和垂直分量的范围分别为 10 至 30 厘米和 20 至 50 厘米。这些数字不仅满足伽利略 HAS 要求，而且通过实现瞬时定位而超越这些要求。此外，结果表明，同样传输的电离层校正的形式误差通常为分米级（1西格玛），通过在导航滤波器中加权其测量值来保护用户免受错误位置的影响。