Research On Single Point Positioning Technology Of Galileo In-Orbit Validation Satellites

Abstract:As a global navigation satellite system, Galileo navigation satellite system is developed and established by European Union (EU). On February10,1999, Council of Europe (CE) formally announced the Galileo project plan and was in charge of the Galileo project together with ESA (European Space Agency). As the first global navigation satellite system for civil users, Galileo is completely independent of the present GPS, GLONASS and BeiDou Navigation Satellite System (BDS) but will keep good compatibility and interoperability with them. Currently, the Galileo constellation consists of four In-Orbit Validation (IOV) satellites. Therefore, Galileo-only positioning has become possible. The advent of Galileo will greatly promote the global positioning user to obtain more frequencies and higer-quality satellite signals. As a result, the improvement on the positioning accuracy can be expected with inclusion of Galileo. This paper systematically investigates the Galileo time and coordinate references, satellites system characteristic, signal characteristic, the accuracy of satellite orbit and clock, single-frequency single point positioning technology and so on. In addition, the technology of GPS/GLONASS/BDS/Galileo single-frequency single point positioning is also investigated. Main research contents of this dissertation are as follows:1. Summarizing the time and space benchmark, satellites system characteristic, signal characteristic of Galileo navigation satellite system in detail. The quality of IOV satellites signal is analyzed using real observations. Evaluating real-time orbit and clock product and broadcast ephemeris product of Galileo IOV satellites. Some experiments also have been carried out.2. Introducing systematically the main error sources and the way of dealing with these errors in Galileo single point position. Furthermore, the correction on the Galileo satellite hardware delay bias and the ionospheric errors using NeQuick2model are addressed.3. Galileo single point positioning (SPP) model is established with the consideration of the satellite hardware delay bias. In addition, Galileo single-frequency single point positioning is performed by using real observation data from MGEX stations based on this model. Also, the SPP accuracy is compared with GPS SPP.4. GPS/Galileo and GPS/GLONASS/BDS/Galileo single point positioning models are established. The method of unifying the time and space benchmark of multi-system is also presented. In addition, the GPS/Galileo and GPS/GLONASS/BDS/Galileo single-frequency single point positioning experiment is also carried out using real observation data from MGEX stations.24figures,9tables and109references.