IMPACT OF MULTI-GNSS COMBINATIONS ON PRECISE POINT POSITIONING UNDER DIFFERENT ATMOSPHERIC CONDITIONS

• Grant number: 25/13202-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2025
• End date: July 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geodesy
• Principal Investigator: Daniele Barroca Marra Alves
• Grantee: Leonardo Augusto Carneiro
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil

Abstract

Precise Point Positioning (PPP) has emerged as an attractive alternative to relative positioning in applications that require high accuracy. Its performance can be enhanced through the combination of multiple GNSS (Global Navigation Satellite System) constellations. In addition to the U.S. GPS (Global Positioning System), the following systems currently orbit the Earth: GLONASS (GLObalnaya NAvigatsionnaya Sputnikovaya Sistema), developed by the former Soviet Union and currently with a complete constellation; the European Galileo system, which is in the deployment phase with a full constellation, though expected to reach full operational capability by 2026; and the Chinese BeiDou system, which is already operational. Earth's atmosphere significantly affects the propagation of GNSS signals, particularly due to the influence of the ionosphere and the neutral atmosphere, which can degrade positioning accuracy and increase the convergence time of PPP solutions. This project aims to evaluate the performance of the multi-GNSS PPP method, focusing on the analysis of convergence time and positional accuracy under different atmospheric conditions, in order to adapt the model and provide more robust and effective solutions. (AU)