The objective of this study will focus on techniques for code, phase and frequency tracking, compatible for very weak GNSS signals (e.g. indoor and urban canyon environments).

Studies on high-sensitivity Rx have already focussed on weak-signal (e.g. indoor and urban canyon environments) acquisition and very narrowband tracking but topics like discriminator design for optimal weak-signal tracking, characterisation of tracking in the vicinity of loops' threshold, and transition from acquisition to tracking for weak-signals have not been addressed sufficiently and in need of a specific study in view of the interest on the GNSS performance in difficult environments.Within the scope of the activity, it can be found (with emphasis on GALILEO):1- The investigation on high-sensitivity tracking techniques and characterisation of its behaviour2- The investigation on techniques to optimize the transition from acquisition to tracking in the vicinity of the tracking loop threshold3- The proof of concept in a single-channel demonstrator