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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 Constellation and Performance Simulator for Testing and Certification
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GNSS Constellation and Performance Simulator for Testing and Certification

机译：用于测试和认证的GNSS星座和性能模拟器

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The global navigation satellite system(GNSS)user receivers,especially mass market receivers,have to face demanding cost constraints.These constraints are not only related to the cost of the hardware itself,but also include development,production,testing,and certification expenses.One approach for saving expenditures in a receiver lifecycle is to use a simulation environment rather than performing cost-and time-intensive field testing and validation.Intensive and reproducible testing and validation are prerequisites for certification of GNSS receivers.It can be expected that most of the current receiver developments will pass through certification processes in the years to come.Within the certification process,three main components of the receiver have to be tested–the RF-front-end,the baseband processing and the position,velocity,and time software(PVT).For a successful certification,especially the PVT module has to fulfil certain requirements regarding performance and robustness.The best way of evaluation is the closed loop test,using a GNSS constellation and performance simulation tool as an input source.Comparing the user defined input parameters with the results of the PVT software provides valuable information about the performance and behaviour of the tested module. rnGNSS signal simulators provide an effective tool for simulating the behaviour of satellite-based navigation systems.They have to model the real world as close as possible,taking various effects and error sources into account.Since software-based receivers evolve rapidly,a strong need for a tool which enables testing and certifying the behaviour of the baseband,implemented in software, is needed. rnAfter a brief introduction on the overall concept,the paper mainly focuses on the certification and testing tasks and the architectural concept of the simulator.Afterwards the main components of the simulator,i.e.the GNSS constellation simulation,the computation of the ephemeris parameters used in the navigation message and the strategies for the simulation of propagation effects are discussed in more detail.At the end,some results of testing and validating a software-based receiver with the GNSS simulator are presented.Thereby main emphasis is placed on the propagation effects.
机译：全球导航卫星系统（GNSS）用户接收器，尤其是大众市场接收器，必须面对苛刻的成本约束。这些约束不仅与硬件本身的成本有关，而且还包括开发，生产，测试和认证费用。节省接收机生命周期支出的一种方法是使用模拟环境，而不是执行费时费力的现场测试和验证，密集而可重复的测试和验证是GNSS接收机认证的前提。当前的接收器发展将在未来几年内通过认证过程。在认证过程中，必须测试接收器的三个主要组件-RF前端，基带处理以及位置，速度和时间软件（PVT）。要获得成功的认证，尤其是PVT模块必须满足有关性能和鲁棒性的某些要求。评估的第一种方法是闭环测试，使用GNSS星座图和性能模拟工具作为输入源。将用户定义的输入参数与PVT软件的结果进行比较，可以提供有关被测模块的性能和行为的有价值的信息。 rnGNSS信号模拟器提供了一种有效的工具，可以模拟基于卫星的导航系统的行为。它们必须尽可能接近现实世界，并考虑各种影响和误差源。由于基于软件的接收器发展迅速，因此迫切需要需要一种能够通过软件实现对基带行为进行测试和认证的工具。 rn在简要介绍了总体概念之后，本文主要关注模拟器的认证和测试任务以及体系结构概念。随后是模拟器的主要组件，即GNSS星座模拟，计算星历中使用的星历参数。最后，给出了使用GNSS模拟器对基于软件的接收机进行测试和验证的一些结果，因此重点放在了传播效果上。

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