Ricerc@Sapienza

Despite pedestrian and vehicle navigation are the key applications enabled by the development of GNSS technology, the best approach to obtain accurate, reliable, continuous and robust PVT (Position-Velocity-Timing) solutions for this purpose has yet to be identified. The real limiting factor is the environment in which the users usually navigate: e.g. multipath effects and cycle slips in harsh urban environments strongly affect, respectively, pseudorange measurements and the continuity of carrier-phase observations.

Objective: The aim of this study was to acknowledge errors in patients positioning in CT colonography (CTC) and their effect in radiation exposure. Materials and methods: CTC studies of a total of 199 patients coming from two different referral hospitals were retrospectively reviewed. Two parameters have been considered for the analysis: patient position in relation to gantry isocentre and scan length related to the area of interest. CTDI vol and DLP were extracted for each patient.

The aim of the experiment "Tracking and Attitude Radio-based Determination In Stratosphere" (TARDIS) is to develop an alternative navigation system based on digital processing of the VHF Omnidirectional Range (VOR) radio-navigation system signal. The radio-navigation systems signal processing can provide a position and attitude estimation for stratospheric vehicles, incrementing the reliability of navigation systems. The TARDIS experiment will be performed on a stratospheric balloon in October 2019.

Climate-induced stresses, more than in the past, expose trees to hazards possibly compromising their stability, with serious risk for people, objects, structures and infrastructures. In order to prevent trees falling phenomena, a constant improvement of the knowledge of relations between trees and meteorological events (trees-wind in particular) is crucial.