High Accuracy Positioning

Abstract: The thrive of big data, cloud computing, and 5G communication lays a solid foundation for smart transportation and autonomous driving. But in these areas, accurate positioning is also indispensable. Current high accuracy positioning services are mainly based on Network RTK. The PPP technology reaches the same level of final accuracy as RTK but requires less data transmission and computational power. This project focuses on PPP technology and explores its potential as a substitution of the current Network RTK. This thesis consists of three parts: theory, solution, and result. The theory part introduces basic mathematics and an overview of the GPS system. Then it analyses GNSS measurement errors and introduces augmentation technologies. The solution part introduces the measurement model and mainstream error correction methods. After that, it focuses on the ionospheric model and IC-PPP method. Based on that, we create the ’sTEC’ interface and enable the ’External TEC’ correction method. The result part presents a comparison between the PPP technology and different correction methods.