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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) >GNSS RAIM Assumptions for Vertically Guided Approaches
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GNSS RAIM Assumptions for Vertically Guided Approaches

机译：垂直引导方法的GNSS RAIM假设

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Receiver Autonomous Integrity Monitoring(RAIM)is currently a simple and efficient solution for civil aviation applications to check the integrity of GNSS down to Non Precision Approaches.The future introduction of new satellite constellations such as the European satellite navigation system Galileo or modernized Global Positioning System(GPS)will imply great improvements in the number as well as the quality of available measurements.More demanding phases of flight such as approaches with vertical guidance could be targeted using RAIM to provide integrity monitoring. rnThe targeted probability of missed detection constitutes a major input of RAIM algorithm.This parameter derives from the integrity risk but also depends on the probability of satellite failure.Thus it refers to the threat model and particularly needs to be detailed.Up to now,most of RAIM algorithms assumed that only one satellite failure could occur at the same time and that the rate of occurrence of such a failure was the one of major service failure.But those assumptions have to be reconsidered for multi constellation RAIM designed for approaches with vertical guidance.Indeed,a larger number of available measurements also implies a larger number of potential faulty measurements for the receiver.Moreover,the targeted phases of flight are characterized by smaller horizontal and vertical tolerable position errors compared to NPA.Therefore,the threatening range errors that need to be detected by the fault detection algorithm have to be reconsidered,since they could have smaller amplitude, and a probability of occurrence that is not clearly defined currently. rnThe aim of the proposed paper is to present some assumptions to be adopted for the design and the evaluation of RAIM algorithms for vertically guided approaches.The way RAIM algorithms can be implemented in order to take into account both civil aviation requirement and threat model is addressed and the way the required probability of missed detection can be set is particularly investigated. rnIn the first part of the paper,the User Equivalent Range Error variance computation is detailed. rnThe concept of critical bias which is the smallest bias on a single pseudorange measurement that leads to a positioning failure is then developed.It is based on the fact that integrity monitoring requires that the navigation system detects the presence of an unacceptably large position error for a given mode of flight.
机译：接收机自主完整性监控（RAIM）目前是一种简单有效的解决方案，适用于民航应用，可从非精确方法检查GNSS的完整性。未来将引入新的卫星星座，例如欧洲卫星导航系统Galileo或现代化的全球定位系统GPS（GPS）意味着可提供的测量数量和质量将大大提高。可以使用RAIM瞄准更苛刻的飞行阶段，例如采用垂直制导的进近，以提供完整性监控。 rn错过检测的目标概率构成了RAIM算法的主要输入。此参数既来自完整性风险，又取决于卫星故障的概率。因此，它是指威胁模型，尤其需要详细说明。 RAIM算法的假设是只能同时发生一次卫星故障，并且这种故障的发生率是主要的服务故障之一。但是对于垂直导航制导的多星座RAIM，必须重新考虑这些假设。的确，可用测量的数量越大，也意味着接收器的潜在故障测量数量也就越大。此外，与NPA相比，目标飞行阶段的水平和垂直容许位置误差都较小。因此，威胁范围误差必须重新考虑需要通过故障检测算法进行检测，因为它们可能具有较小的幅度de，以及目前尚未明确定义的发生概率。 rn本文的目的是提出一些假设，以设计和评估用于垂直引导方法的RAIM算法.RAIM算法的实现方式可以兼顾民航需求和威胁模型并且特别研究了可以设置所需的漏检概率的方法。在本文的第一部分，详细介绍了用户等效范围误差方差的计算。 rn随后提出了临界偏差的概念，该临界偏差是单个伪距测量结果中导致定位失败的最小偏差。它基于以下事实：完整性监控要求导航系统检测到存在无法接受的较大位置误差。给定的飞行模式。

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