The INSPIRE project aims to design, develop, and validate a novel GNSS-based positioning architecture tailored for challenging environments such as urban canyons and deep-urban areas. The project leverages meta-signal processing, peer-to-peer ranging, and hybrid positioning to improve accuracy, robustness, and availability of GNSS-based solutions in scenarios where traditional positioning systems struggle.

INSPIRE's ultimate objective is to push the frontier of resilient and accurate GNSS positioning by combining state-of-the-art signal processing with cooperative and sensor-fusion-based strategies, paving the way for next-generation navigation systems that can operate reliably in the most demanding environments.

Key Innovations are:

·        Meta-Signal Processing: Advanced wideband GNSS signal processing techniques that enhance code observables and provide greater resilience to interference.

·        Hybrid Positioning Engines: Integration of GNSS, inertial, and peer-to-peer measurements into a unified framework for high-accuracy, real-time positioning.

·        Peer-to-Peer (P2P) Ranging: A novel cooperative ranging architecture based on COTS receivers, improving relative positioning performance, particularly in GNSS-challenged scenarios.

·        Modular and Flexible Architecture: Implementation of a breadboard system using the SX3 software-defined GNSS receiver platform, enabling modular integration of new algorithms and real-time signal processing capabilities.

The system will be validated through extensive field testing in representative environments including:

·        Open-sky and rural conditions (static and dynamic),

·        Urban settings with moderate obstructions,

·        Deep-urban environments with severe GNSS signal degradation.

Performance will be assessed using standardized Figures of Merit such as PVT accuracy, service availability, signal tracking quality, and time-to-fix. The validation will include real-time and post-processed evaluations using RTK/PPP corrections and a high-precision reference receiver setup.