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首页> 外文会议>Proceedings of the 22nd international technical meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2009) >Study of a GBAS Model for CAT II/III Simulations
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Study of a GBAS Model for CAT II/III Simulations

机译：用于CAT II / III模拟的GBAS模型的研究

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Since many years,civil aviation has identified GNSS as an attractive mean to provide navigation services for every phase of flight due to its wide coverage area. However,GPS standalone cannot meet ICAO requirements in terms of accuracy,integrity,availability and continuity,particularly in the case of precision approaches.To achieve improved level of performance, different augmentation systems have been developed aiming at enhancing and monitoring the quality of the Signal-In-Space(SIS).In particular,GBAS for Ground Based Augmentation System allows guarantying a very high level of performance in a given coverage area surrounding an airport for example. rnCurrently,GBAS is foreseen as an important source of innovation for civil aviation since it has already been certified for CAT I precision approaches and may allow reaching ICAO requirements down to CAT II/III minima, then providing an alternative to ILS.This possibility is actively investigated and ICAO and Industry standardization bodies are currently deriving requirements for GBAS CAT II/III. rnAutoland simulations for CAT II/III certification require numerous simulations to assess statistically the aircraft capability to autoland.Therefore,it is necessary to identify the GBAS GLS behavior with sufficient fidelity, taking into account physical phenomenon affecting accuracy,continuity and integrity,but still,with adequate limited representativity,assuming that it will feed an autoland simulator dedicated to airworthiness demonstration of aircraft guidance laws. rnA model has been proposed in the past but the evolution of CAT II/III requirements and the lack of information on the validation methods used make it necessary to investigate further this subject. rnThe goal of this paper is to provide the first steps to the development of a model of GBAS L1 C/A depicting the behavior of the outputs of the system with sufficient fidelity for CAT II/III autoland simulations.Our study is based on the previously proposed model.We focused here on the nominal error model which so far appears to be an adequate representation of GBAS behavior for autoland simulations.However,we propose some improvements to update this model so as to reflect the evolution of the requirements and enhance its representativeness while meeting its primary objective to serve airworthiness demonstration.Moreover,additional simulations have been run to extend this model to Cat III airports all over the world since it has been first developed only for North America.
机译：多年来，民航业已将GNSS视为一种有吸引力的手段，因为其覆盖范围广，可为每个飞行阶段提供导航服务。但是，独立的GPS不能满足国际民航组织在准确性，完整性，可用性和连续性方面的要求，特别是在采用精密方法的情况下。为了提高性能水平，开发了各种增强系统，旨在增强和监测信号质量太空中（SIS）。例如，地面增强系统的GBAS可以确保在机场周围的给定覆盖范围内提供非常高的性能。 rn目前，GBAS被认为是民航创新的重要来源，因为它已经获得CAT I精密方法的认证，并可能达到国际民航组织对CAT II / III最低要求的要求，从而为ILS提供了替代方案。经调查，ICAO和行业标准化机构目前正在得出GBAS CAT II / III的要求。 rn进行CAT II / III认证的自动着陆仿真需要大量仿真，以统计方式评估飞机的自动着陆能力。因此，有必要充分保真地识别GBAS GLS行为，同时考虑到影响准确性，连续性和完整性的物理现象，但是，具有足够有限的代表性，假设它将为专门用于飞机制导律适航示范的自动降落模拟器提供数据。 rn过去曾提出过一个模型，但是CAT II / III要求的演变以及所用验证方法的信息不足，因此有必要进一步研究该主题。 rn本文的目的是为GBAS L1 C / A模型的开发提供第一步，该模型描述了具有足够保真度的系统输出行为，以进行CAT II / III自动着陆模拟。此处，我们集中在名义误差模型上，到目前为止，该模型似乎足以代表GBAS行为用于自动着陆仿真。但是，我们提出了一些改进以更新该模型，以反映需求的演变并增强其代表性。自最初仅针对北美地区开发该模型以来，就已经进行了额外的仿真，以将该模型扩展到全世界的Cat III机场。

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