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首页> 外文会议>Proceedings of the Institute of Navigation 2012 international technical meeting >Characterizing Local Effects on Protection Level Concept in Urban Environments
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Characterizing Local Effects on Protection Level Concept in Urban Environments

机译：表征城市环境中保护水平概念的局部影响

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In this paper, the focus is on the characterization of thernlocal effects on satellite based integrity concept in urbanrnenvironments. For this purpose and to have a betterrnapprehension of the operational environment andrntechniques best suited for it, one such location, therndowntown and suburban area of Munich was selected.rnThe task of collecting navigation data was accomplishedrnusing two different receivers at the same time [1]. Thernfirst one, used as a reference, was a professional surveygradernNovAtel receiver, able to process the navigationrnsignals broadcast on both L1 and L2 bands and performrnReal Time Kinematic measurements. The receiver wasrncombined with an Inertial Measurement Unit (IMU) thatrnguaranteed a positioning accuracy on the order of fewrncentimeters, even during short signal outages. The secondrnone was a survey-grade Septentrio PolaRx2e receiver,rnable to decode and process the European GeostationaryrnNavigation Overlay Service (EGNOS) integrity messagesrnand output the Horizontal Protection Level (HPL) [2]. Arnpair of low cost car navigation receivers was alsorndeployed to assess the accuracy in commercial domain.rnThe data from these receivers was post-processed forrnfurther reasoning and conclusions. The analysis of thisrndata demonstrated that the poor signal conditions due tornthe blockage of signals and the presence of multipathrnlimit the integrity performance. The integrity concept hasrnto meet these challenges. Multipath introduces a bias andrnalso adds to the total error variance. So, proper multipathrnmitigation techniques need to be deployed. The limitationrnof signal unavailability can be overcome throughrntechnologies like EGNOS Data Access Service (EDAS)rnwhich recovers integrity data through a different link [3].rnThe analysis provides the required parameters to developrntechniques for automotive applications in harsh andrnsuburban environments.
机译：在本文中，重点是表征对城市环境中基于卫星的完整性概念的局部影响。为此，为了更好地理解操作环境和最适合的技术，选择了一个位置，即慕尼黑的市区和郊区。同时使用两个不同的接收器完成了收集导航数据的任务[1]。作为参考，第一个是专业的测量级NovAtel接收器，能够处理在L1和L2频段上广播的导航信号并执行实时运动学测量。接收机与惯性测量单元（IMU）组合使用，即使在信号中断很短的时候，惯性测量单元也可以保证几厘米的定位精度。第二个是调查级的Septentrio PolaRx2e接收器，它能够解码和处理欧洲对地静止卫星导航叠加服务（EGNOS）完整性消息，并输出水平保护等级（HPL）[2]。还部署了低成本汽车导航接收器Arnpair来评估其在商业领域中的准确性。这些接收器的数据经过了后处理，以进一步推论和得出结论。对这些数据的分析表明，由于信号阻塞和多路径的存在而导致的不良信号状况限制了完整性性能。完整性的概念已经可以应对这些挑战。多径引入了偏差，也增加了总误差方差。因此，需要部署适当的多路径缓解技术。信号不可用性的局限性可以通过诸如EGNOS数据访问服务（EDAS）之类的技术来克服，该技术可以通过不同的链接来恢复完整性数据[3]。该分析为开发用于恶劣和郊区环境中的汽车技术提供了必要的参数。

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