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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) >Multi-Constellation GNSS Signal Simulator and Its Software Implementation
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Multi-Constellation GNSS Signal Simulator and Its Software Implementation

机译：多星座GNSS信号模拟器及其软件实现

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A multi-constellation GNSS signal simulator has been developed,which is currently capable of simultaneously generating five carrier signals of three GNSS constellations,including GPS-L1,Galileo-E1.The architecture of this GNSS signal simulator consists of the following three main parts:simulator software running on PC server;IF GNSS signals generator based on the platform of DSP and FPGA;RF up-conversion and combining module.And the first part will be focused on in this paper. rnThe simulator software consists of the following functional modules:simulator Graphical User Interface(GUI);dynamic receiver trajectories generation; GNSS satellite constellations simulation;signal propagation channels and error sources simulation;the navigation messages generation;GNSS signal parameters computation for IF/RF signal generation;data frame making and transfer to the signal generator hardware via PCI-E interface. rnThe receiver trajectories generation allows the user to define a wide range of receiver motion scenarios.The corresponding software module in this signal simulator has been implemented by a parameterized trajectory representation,which supports real-time three- dimensional receiver trajectories generation. rnThe long-term satellite constellation simulation and the corresponding navigation messages generation are critical to some user simulation missions.It has been realized in this signal simulator by the circulatory use of ephemeris data files and the ephemeris parameters extrapolation. rnDue to the uncertainties of the GNSS systems in the development or improvement phase,the software based solutions are proposed and realized in this signal simulator,for changes in future have minimal impact on the simulator architecture. rnUnder the requirement of multi-frequency and multi- system,the multi-thread scheme and the communication interrupt scheme have been designed in the signal simulator for efficient and real-time processing purpose. rnThe testing and validation of this GNSS signal simulator at the data level has been performed.First,the ground traces for the satellite constellations determined by the orbital parameters are analyzed.Second,the simulated error sources are configured,and the resulting pseudo- range errors are evaluated.As for multi-path,by using a COTS(Commercial Off-The-Shelf)GNSS receiver the multi-path error envelopes are measured.Third,by connecting this simulator to the COTS GNSS receiver,a static scenario is specified,and the positioning performance is analyzed.And fourth,a set of motion scenarios are specified,and the receiver trajectories are measured and compared.
机译：已开发出一种多星座GNSS信号模拟器，目前能够同时生成三个GNSS星座的五个载波信号，包括GPS-L1，Galileo-E1。该GNSS信号模拟器的体系结构包括以下三个主要部分：在PC服务器上运行的仿真器软件；基于DSP和FPGA平台的IF GNSS信号发生器； RF上变频和合并模块。本文的第一部分将重点介绍。 rn仿真器软件包含以下功能模块：仿真器图形用户界面（GUI）；动态接收器轨迹生成；以及GNSS卫星星座仿真；信号传播通道和误差源仿真；导航消息生成；用于IF / RF信号生成的GNSS信号参数计算；数据帧制作以及通过PCI-E接口传输到信号生成器硬件。 rn接收器轨迹生成允许用户定义各种各样的接收器运动场景。此信号模拟器中的相应软件模块已通过参数化轨迹表示实现，支持实时三维接收器轨迹生成。 rn长期的卫星星座图仿真和相应的导航消息生成对于某些用户仿真任务至关重要。已经通过循环使用星历数据文件和星历参数外推在此信号模拟器中实现了这一目标。由于GNSS系统在开发或改进阶段存在不确定性，因此在此信号模拟器中提出并实现了基于软件的解决方案，因为未来的变化对模拟器架构的影响很小。 rn在多频，多系统的要求下，信号模拟器中设计了多线程方案和通信中断方案，以实现高效，实时的处理。 rn已经对该GNSS信号模拟器进行了数据级别的测试和验证。首先，分析了由轨道参数确定的卫星星座的地面轨迹。其次，配置了模拟误差源，并得出了伪距误差对于多路径，通过使用COTS（现成的商用）GNSS接收器来测量多路径误差包络。第三，通过将该模拟器连接到COTS GNSS接收器，指定了静态方案，第四，确定一组运动场景，测量并比较接收机的轨迹。

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