Design and validation of a flexible software-based generator of realistic GNSS signals

N-FUELS (FUll Educational Library of Signals for Navigation) is a software-based generator of Global Navigation Satellite System (GNSS) signals [1]. One of the most relevant aspects of N-FUELS can be individuated in its versatility, being a collection of MATLAB
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modules. This paper introduces a new module of N-FUELS suitable to simulate realistic GNSS signals from multiple satellites, with plausible code delays and Doppler frequency shifts. With the new module, N-FUELS can reproduce GNSS signals as received by both static and dynamic users. The work done to upgrade the software is described in the paper together with some examples of possible applications of the new version of the tool.