Simulation Analysis for Performance Improvements of GNSS-based Positioning in a Road Environment

摘要

Global Navigation Satellite Systems (GNSSs), such as the Global Positioning System (GPS) in the USA, the GLObal NAvigation Satellite System (GLONASS) in Russia, and the Galileo in the EU, determine a target position using a satellite signal. They are widely used around the globe at this time. However, there is a critical obstacle when attempting to run a navigation system in a land vehicle. In contrast to aircraft or vessels, which operate in open areas without any obstacles, land vehicles must deal with signal occlusion caused by surrounding buildings, skyscrapers and other objects, especially in urban areas. In order to solve this problem, many researchers have studied many different methods, such as GPS/GLONASS-integrated positioning; pseudolite, which produces a signal similar to that of GPS; and GPS/Vision integrated positioning. These studies have mainly focused on integrated positioning methods. In contrast, this paper focuses on the relationship between the position of a new signal generator and positioning error for high-accuracy positioning in GPS shaded areas using simulation analysis. Through this analysis, we confirmed that horizontal positioning error is the lowest (10m) in the urban canyon when the degrees of geometric stability is the best.