This paper investigates the potential vertical guidance performance of global positioning system (GPS)/wide area augmentation system (WAAS) user avionics sensor when the modernized GPS and Galileo are available. This paper will first investigate the airborne receiver code noise and multipath (CNMP) confidence (σair). The σair will be the dominant factor in the availability analysis of an L1–L5 dual-frequency GPS/WAAS user avionics sensor. This paper uses the MATLAB Algorithm Availability Simulation Tool (MAAST) to determine the required values for the σair, so that an L1–L5 dual-frequency GPS/WAAS user avionics sensor can meet the vertical guidance requirements of APproach with Vertical guidance (APV) II and CATegory (CAT) I over conterminous United States (CONUS). A modified MAAST that includes the Galileo satellite constellation is used to determine under what user configurations WAAS could be an APV II system or a CAT I system over CONUS. Furthermore, this paper examines the combinations of possible improvements in signal models and the addition of Galileo to determine if GPS/WAAS user avionics sensor could achieve 10 m Vertical Alert Limit (VAL) within the service volume. Finally, this paper presents the future vertical guidance performance of GPS user avionics sensor for the United States’ WAAS, Japanese MTSAT-based satellite augmentation system (MSAS) and European geostationary navigation overlay service (EGNOS).
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机译：本文研究了现代化GPS和Galileo可用时全球定位系统（GPS）/广域增强系统（WAAS）用户航空电子传感器潜在的垂直引导性能。本文将首先研究机载接收机代码噪声和多径（CNMP）置信度（σ air ）。在L1-L5双频GPS / WAAS用户航空电子传感器的可用性分析中，σ air 将是主要因素。本文使用MATLAB算法可用性仿真工具（MAAST）确定σ air 所需的值，以便L1-L5双频GPS / WAAS用户航空电子传感器可以满足垂直导航要求垂直美国（CONUS）上的垂直导向（APV）II和CATegory（CAT）I的APproach。包含伽利略卫星星座的经过修改的MAAST用于确定WAAS在哪种用户配置下可以是CONUS上的APV II系统或CAT I系统。此外，本文研究了信号模型可能的改进和伽利略系统的组合，以确定GPS / WAAS用户航空电子传感器是否可以在服务范围内达到10 m的垂直警报极限（VAL）。最后，本文介绍了用于美国WAAS，日本基于MTSAT的卫星增强系统（MSAS）和欧洲对地静止导航覆盖服务（EGNOS）的GPS用户航空电子传感器在未来的垂直导航性能。
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