Study and Design of GNSS-based Positioning Units Integrating Collaborative Virtual Ranging

Andrea Nardin

Study and Design of GNSS-based Positioning Units Integrating Collaborative Virtual Ranging.

Rel. Fabio Dovis. Politecnico di Torino, Master of science program in Communications And Computer Networks Engineering, 2018

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Abstract

In a Global Navigation Satellite System (GNSS) the distance from (at least) 4 satellite vehicles needs to be measured by a receiver to obtain an estimate of its position. This information is extracted from signals transmitted by satellites, but GNSS services can fail or lose reliability when propagation is not in Line-of-Sight (LOS) conditions. In this sense, an urban scenario represents a harsh environment where obstacles may obstruct the satellites view. As a result, limited availability and lack of continuity commonly arise.The rise of smart transport paradigm, and the development of Intelligent Transport Systems (ITS), is nowadays a task of interest for the GNSS community, since it is related to precise and reliable positioning systems.

In view of such a framework, where the accurate estimation of the vehicle's position plays a key role, service discontinuity experienced by users is an even more dangerous threat.A well-known countermeasure to this issue is the integration of additional measurements within the navigation algorithm, addressed to assure the continuity of service or to improve the positioning performance