A5076995764- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Inertial Sensor and Navigation
- earthquake and tectonic studies
- Ionosphere and magnetosphere dynamics
- Seismology and Earthquake Studies
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Earthquake Detection and Analysis
- Indoor and Outdoor Localization Technologies
- Maritime Navigation and Safety
- Soil Moisture and Remote Sensing
- Cryospheric studies and observations
- Geophysics and Sensor Technology
- Italian Literature and Culture
- Landslides and related hazards
- Ocean Waves and Remote Sensing
- Music Technology and Sound Studies
- Advanced SAR Imaging Techniques
- Educational and Social Studies
- Structural Health Monitoring Techniques
- Seismic Waves and Analysis
- 3D Surveying and Cultural Heritage
- Tree Root and Stability Studies
- Oceanographic and Atmospheric Processes
- History and Developments in Astronomy
Sapienza University of Rome
2015-2024
Universidad de Jaén
2011
National Institute for Astrophysics
2009
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2003
Brescia University
1995-1998
Abstract It is well known that tsunamis can produce gravity waves propagate up to the ionosphere generating disturbed electron densities in E and F regions. These ionospheric disturbances be studied detail using total content (TEC) measurements collected by continuously operating ground-based receivers from Global Navigation Satellite Systems (GNSS). Here, we present results a new approach, named VARION (Variometric Approach for Real-Time Ionosphere Observation), estimate slant TEC (sTEC)...
In this study we assess the quality of multi-GNSS observations recent Android smartphones. The results reveal a significant drop smartphone carrier-to-noise density ratio (C/N0) with respect to geodetic receivers, and discernible differences among constellations frequency bands. We show that higher elevation satellite, larger discrepancy in C/N0 between receivers Thus weighting scheme may be superior dependent one usually adopted for GNSS observations. also discover code pseudoranges are...
[1] We show the feasibility of a real-time estimation waveforms and coseismic displacements, within few centimeters in accuracy, with stand-alone dual-frequency Global Positioning System (GPS) receiver using so-called “variometric” approach. The approach is based on time single-differences carrier phase observations collected at high-rate (1 Hz or more) receiver, standard GPS broadcast products (orbits clocks), which are ancillary information routinely available real time. In approach,...
Online Material: Tables of statistical indexes; figures comparing displacement solutions. The Global Positioning System (GPS) has been repeatedly proven to be a powerful tool estimate coseismic displacements and waveforms, with accuracies ranging from few millimeters centimeters. These promising results were achieved following two main strategies: differential positioning (DP) precise point (PPP; Bock et al. [1993], Kouba [2003], Larson [2007], [2009], Ohta [2012], Xu Hung Rau [2013]). In...
The variometric approach leverages the use of dual-frequency combinations time-single differences GNSS phase observations. Successfully applied in seismology (VADASE, [1,2]) and ionospheric (VARION, [3]), this methodology is explored study for its potential near real-time tropospheric delay tracking. Its application to weather forecasting could significantly improve current tools, allowing a timely detection severe events through monitoring. This research investigates retrieval absolute ZTD...
Here, we present the application to great Tohoku-oki (Japan) earthquake (United States Geological Survey <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">M</i> = 9.0, March 11, 2011, 05:46:24 Coordinated Universal Time) of a novel approach, named Variometric Approach for Displacements Analysis Stand-Alone Engine, able estimate accurate coseismic displacements and waveforms in real time, global reference frame, just using standard broadcast products...
The main objective of this work is to investigate on precise positioning with a GPS and Galileo enabled chipset embedded in smartphone. analysis carried out code carrier-based algorithms different scenarios: simulated, stationary, pedestrian vehicular. areas investigated are single frequency, the benefits multi-constellation GNSS raw data quality provided by Currently smartphones use only one frequency (L1): an important constraint design algorithm mainly due ionospheric effect. Hence, based...
The number of Android devices enabling access to raw GNSS (Global Navigation Satellite System) measurements is rapidly increasing, thanks the dedicated Google APIs. In this study, Xiaomi Mi8, first dual-frequency smartphone embedded with Broadcom BCM47755 chipset, was employed by leveraging features L5/E5a observations in addition traditional L1/E1 observations. aim paper present two different applications Geoscience, both based on variometric approach and able work real time. particular,...
Abstract. The estimation of the precipitable water vapour content (W) with high temporal and spatial resolution is great interest to both meteorological climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order obtain accurate frequent measurements this atmospheric parameter. Among them, relative low cost easy deployment sun–sky radiometers, or sun photometers, operating several international networks, allowed development automatic...
The goal of this article is the illustration new functionalities VADASE (Variometric Approach for Displacements Analysis Stand-alone Engine) processing approach. was presented in previous works as an approach able to estimate real time velocities and displacements a global reference frame (ITRF), using high-rate (1 Hz or more) carrier phase observations broadcast products (orbits, clocks) collected by stand-alone GNSS receiver, achieving accuracy within 1–2 cm (usually better) over intervals...
The knowledge of water vapour distribution is a key element in atmospheric modeling and considerable information, also at the local scale, can be derived from GPS-ZTD (global positioning system-Zenith total delay) data.
From the wide range of methods available to landslide researchers and practitioners for monitoring ground displacements, remote sensing techniques have increased in popularity. Radar interferometry with their ability record movements order millimeters been more frequently applied recent years. Multi-temporal can assist landslides on regional slope scale thereby assessing related hazards risks. Our study focuses Corvara Italian Alps, a complex earthflow spatially varying displacement...
The 31 October 2013 ML 6.4 Ruisui earthquake was well recorded by twelve 50-Hz, four 20-Hz and thirteen 1-Hz GPS receivers, twenty-five strong motion stations located within the epicentral distance of 90 km in eastern Taiwan. Kinematic positioning solutions estimated GNSS software (TRACK, RTKLIB, GIPSY, VADASE) are used to derive seismic waveforms co-seismic displacements for this event; accelerometers verify capability high rate detect waves generated earthquake. Results show that...
Abstract The purpose of this work is to provide the methodological and instrumental framework for establishment a new absolute gravity height reference network in Sicily. aim contribute systems Italian area, useful scientific technological activities related field proper definition modern system region. composed 5 stations, evenly distributed form large mesh, which roughly covers entire Since four five selected stations were measured also 1990s, it was possible evaluate whether long-term...
Abstract. The SAR (Synthetic Aperture Radar) imagery are largely used for the environmental, structures and infrastructures monitoring. In particular, Differential Interferometry (DInSAR) is a well known technique that allows producing spatially dense displacement maps with centimetre to millimetre accuracy. signal characterized by phase amplitude value DInSAR remote sensing analyse deformation phenomena affecting both extended natural areas localized man-made structures, exploiting...
VIRTIS-M is a visible-infrared (VIS-IR) image spectrometer designed for the Rosetta mission; it intends to provide detailed informations on physical, chemical, and mineralogical nature of comets asteroids. The in-flight performances are expected be influenced by various disturbances, like initial strong vibrations rocket, long duration experiment (from 2003 2010), as well other possible environmental changes; therefore, an recalibration procedure mandatory. Quite often in such kinds...
Spaceborne Interferometric Synthetic Aperture Radar (InSAR) is a well established technique useful in many land applications, such as monitoring tectonic movements and landslides or extracting digital elevation models. One of its major limitations the atmospheric variability, particular high water vapor spatial temporal which introduces an unknown delay signal propagation. On other hand, these effects might be exploited, so InSAR could become tool for highresolution mapping. This paper...
A new low-cost L1/L2c receiver board is presented in this short letter, along with its first tests. The main strength of the low price tag (around 200 EUR, quantities hundreds) as an effective dual-frequency receiver. effectiveness was at proven by a pedestrian walk experiment on closed loop, allowing evaluation closure errors. Raw measurements were collected and processed real-time scenario through variometric approach implemented VADASE software. Epoch-by-epoch velocities estimated basis...