Low-cost Accurate Positioning System in Urban Area ~How to use GPS/GNSS for Intelligent Vehicle~

Vehicle positioning is important for intelligent transportation applications. Accurate positioning systems are needed for intelligent vehicles, self-driving cars and driver assistance systems. Then, GPS/GNSS is the focus of attention to estimate vehicle position. GPS/GNSS is the powerful infrastructure and sensor to measure absolute position on the earth. However, GPS/GNSS positioning accuracy is decreased in urban area, because they are easily affected by signal blocking and multipath conditions that surrounding high-rise buildings. Self-driving cars require accurate and robust positioning is to navigate and control the vehicle in a complex urban road environment that includes cars and pedestrians.