PERIODO: GIUGNO This course will give an overview on Global Navigation Satellite Systems (GNSS) fundamentals, receivers architectures and applications for scientific purposes, such as atmospheric and environmental remote sensing. One of the major sources of error in GNSS positioning is the signal propagation through the atmosphere. The refractivity property modifies the propagation speed, thus inducing an additional delay in the pseudorange. If not modelled sufficiently well, it can lead to significant errors. In addition, during geomagnetic storms and at equatorial and polar latitudes, signal diffraction due to irregularities in the electron distribution leads to rapid fluctuations of signal amplitude and phase, called scintillations, leading to errors in carrier phase observations. At the same time, if the receiver is static and its position is known with a good accuracy, it is possible to invert the problem and process GNSS observables to characterize the effects along the signal propagation path and the properties of ionosphere. The systematic measurement of observables and the inversion of the typical positioning equation are the basis of GNSS atmospheric Remote Sensing.

This course is divided in three parts. During the first and introductory part, an overview of GNSS systems, signal, receivers, main observables is provided, along with an overview of remote sensing and reflectometry techniques. During the second part, the impact of ionosphere on GNSS signal propagation will be detailed, focusing both on the delay modelling and on scintillation detection and mitigation. The use of GNSS receivers for ionospheric monitoring and analysis will be detailed, showing the results of recent research projects. Then, during the third part, the analysis of atmospheric monitoring techniques will be provided, especially focusing on troposphere and atmospheric multipath. Moreover, practical activities related to GNSS positioning considering a network of reference stations will be done by the students, to apply what they have studied during the first part of the course. CALENDARIO: Calendario: June 2018 - Thursday 21, 14:00 – 17:00 a - Friday 22, 10:00 – 12:00 a - Monday 25, 10:00 – 12:00 a - Monday 25, 14:00 – 17:00 b - Tuesday 26. 14:00 – 17:00 a - Wednesday 27, 09:00 – 11:00 b a) Sala C (close to room 14) b) Room LGI (DIATI, door 3)

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Gli studenti e le studentesse con disabilita o con Disturbi Specifici di Apprendimento (DSA), oltre alla segnalazione tramite procedura informatizzata, sono invitati a comunicare anche direttamente al/la docente titolare dell'insegnamento, con un preavviso non inferiore ad una settimana dall'avvio della sessione d'esame, gli strumenti compensativi concordati con l'Unita Special Needs, al fine di permettere al/la docente la declinazione piu idonea in riferimento alla specifica tipologia di esame.