Combined GPS and Galileo point positioning: an analysis of Klobuchar and NeQuick ionospheric models performances at different latitudes

• Grant number: 17/22223-2
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• Start date: May 01, 2018
• End date: October 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geodesy
• Principal Investigator: Daniele Barroca Marra Alves
• Grantee: Paulo de Tarso Setti Júnior
• Supervisor: Marcio Henrique Oliveira de Aquino
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Institution abroad: University of Nottingham, University Park, England
• Associated to the scholarship: 16/24861-3 - GNSS point positioning: implementation and evaluation of new models, systems and signals, BP.MS

Abstract

Global Navigation Satellite System (GNSS) based positioning was initiated in the 1970's, when GPS (Global Positioning System) was launched. In the late 1990's/early 2000's the European Union started the development of its own system, Galileo, which already has 15 operational satellites in orbit. The integration of these systems for positioning activities is advantageous due to the large number of satellites available for the user, which would provide better coverage in restricted visibility areas, the possibility of increasing the elevation mask, and the possibility to obtain a better satellite geometry. Klobuchar and NeQuick Ionospheric Models were developed for single-frequency GPS and Galileo users, respectively. With this research, we aim to evaluate the combined use of these two systems in stand-alone Point Positioning using precise ephemeris, and evaluate the performance of both Klobuchar and NeQuick models over different ionospheric conditions and at different latitudes. The tendency is that in the future these systems will work together, improving the availability and accuracy of geodetic positioning. In this sense, this project is justified by the need to carry out research is this field, especially in Brazil, where few studies have been conducted so far. The project will be undertaken at University of Nottingham, with a supervisor from the Nottingham Geospatial Institute, with experience on mitigation of ionospheric effects on GNSS. (AU)