High-Sensitivity receivers, Assisted GNSS
High Sensitivity receivers are designed to deal with weak signals typical of indoor and dense urban environments where the GNSS signal is attenuated by the surrounding walls and buildings. Such signals cannot be “sensed” by common GPS receivers, whose positioning capabilities are dramatically impaired in such scenarios.
This research activity focuses on the analysis and implementation of advanced digital signal-processing techniques aiming at improving the sensitivity of GNSS receivers. This activity is also tightly related to those applications that benefit of indoor GNSS capabilities, such as the ubiquitous positioning of mobile devices (e.g. phones, PDAs, etc.).
Particular importance is given to the Assisted-GNSS technique, based on the cooperation of both the mobile terminal and the network infrastructure in the computation of the user position, allowing for a sensitivity improvement also for low-cost devices.