This project aims to investigate advanced processing techniques for future radio-navigation receivers and to identify possible receiver architectures with the objective of improving final positioning performance in real environments. Tracking/Positioning performance and robustness in channels affected by severe channel conditions (multiple paths, fading channels, blockage, shadowing) shall be the focus of the activity. The activity shall identify a set of criteria/parameters for the evaluation of the performance of the Rx architectures including the applicable user environments. The activity shall trade off performance against complexity and compare the results of the selected architectures against the set of identified criteria. The selection shall take into account the feasibility for implementation in real receivers in the near future.