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Machine-Learning to model GNSS systems

GNSS simulations are an important toolset supporting system engineering trade-offs and decisions. They are used to display and monitor key system performance indicators as well as study system behaviour, both through synthetic scenarios and real data replay. Industry and ESA currently use different tools to simulate GNSS systems, however often constrained to undertake only one of two different…

AI-enabled baseband algorithms for High Fidelity Measurements

Critical applications such as autonomous vehicles and machine control require high fidelity raw measurements in challenging environments. In spite of significant progress made in recent years, for those applications GNSS performance remains unsatisfactory in terms of reliability in challenging environments, therefore requiring improvement. The main challenges lie in handling transfer functions…

Precise Timing for Indoor Small Cells

GNSS signals are widely used for time synchronization purposes in many different application sectors, including telecom, finance and energy. Telecom service providers, in particular, consider GNSS-based synchronization well adapted to macro-cells whereas alternative synchronization technologies (e.g. wire-based solutions like Precise Time Protocol) are deemed more suitable for indoor small cells,…

Collaborative Processing of Distributed Receivers of Opportunity for Jamming and Spoofing Mitigation

The fast evolution of the Internet of Things (IoT), commercial Cloud platforms, and the future 5G standards are boosting development of new applications and technologies in the PNT field. Devices are expected to be increasingly connected to Internet in the next few years, storage and processing of data in the Cloud is already a reality, with 5G expected to bring very soon higher data rates and…

Feasibility study of a space-based relativistic PNT system

All GNSS in operation at present are based on Newtonian physics and rely on global reference frames fixed to Earth. Relativistic effects are treated as deviations that need to be corrected for. Precision and stability over time of the reference frames is provided via ground stations and they are limited by the Earth’s dynamics (e.g. variations of the Earth’s rotation rate, plate tectonics,…