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Simulation of GNSS reflected signals and estimation of position accuracy in GNSS-challenged environment

机译：GNSS反射信号的仿真和GNSS挑战环境中位置精度的估计

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The paper describes the development and testing of a simulation tool, called QualiSIM. The tool estimates GNSS-based position accuracy based on a simulation of the environment surrounding the GNSS antenna, with a special focus on city-scape environments with large amounts of signal reflections from non-line-of-sight satellites. The signal reflections are implemented using the extended geometric path length of the signal path caused by reflections from the surrounding buildings. Based on real GPS satellite positions, simulated Galileo satellite positions, models of atmospheric effect on the satellite signals, designs of representative environments e.g. urban and rural scenarios, and a method to simulate reflection of satellite signals within the environment we are able to estimate the position accuracy given several prerequisites as described in the paper. The result is a modelling of the signal path from satellite to receiver, the satellite availability, the extended pseudoranges caused by signal reflection, and an estimate of the position accuracy based on a least squares adjustment of the extended pseudoranges. The paper describes the models and algorithms used and a verification test where the results of QualiSIM are compared with results from collection of real GPS data in an environment with much signal reflection.
机译：本文介绍了仿真工具的开发和测试，称为QualiSim。该工具估计基于GNSS的位置精度，基于GNSS天线周围环境的仿真，特别侧重于城市Scape环境，具有来自非视线卫星的大量信号反射。使用由周围建筑物的反射引起的信号路径的扩展几何路径长度来实现信号反射。基于真正的GPS卫星位置，模拟伽利略卫星位置，卫星信号的大气效果的模型，代表性环境设计。城乡情景，以及模拟环境中卫星信号反射的方法我们能够估计纸张中所述的几个先决条件的位置准确性。结果是从卫星到接收器的信号路径的建模，卫星可用性，由信号反射引起的延伸伪距，以及基于延伸伪距的最小二乘调节的位置精度的估计。本文介绍了所使用的模型和算法和验证测试，验证测试与具有多种信号反射的环境中的真实GPS数据集合的结果进行比较。

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