Fabio Dovis

Fabio Dovis
Politecnico di Torino | polito · DET - Department of Electronics and Telecommunications

Ph.D in Electronics and Communications Eng.

About

328
Publications
48,595
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2,709
Citations
Additional affiliations
October 2014 - January 2017
Politecnico di Torino
Position
  • Professor (Associate)

Publications

Publications (328)
Article
An increasing number of innovative technologies are fostering Intelligent Transportation Systems (ITS), thus setting the milestones of future paradigms in vehicular mobility. Among these technologies, Positioning Navigation and Timing (PNT) systems and low-latency communication networks play a fundamental role. This synergy can enable cooperative a...
Preprint
Tight integration of Global Navigation Satellite System (GNSS) and Ultra-Wide Band (UWB) is growing popularity as a positioning strategy relying on mass-market devices for applications dealing with localisation and tracking of agents in challenging environments. However, due to independent clocks of Commercial off-the-shelf (COTS) devices, the offs...
Preprint
Tight integration of Global Navigation Satellite System (GNSS) and Ultra-Wide Band (UWB) is growing popularity as a positioning strategy relying on mass-market devices for applications dealing with localisation and tracking of agents in challenging environments. However, due to independent clocks of Commercial off-the-shelf (COTS) devices, the offs...
Conference Paper
The momentum taken by the space sector in the exploration of our Moon pushes private and governmental actors to intensify their efforts for launching missions to our natural satellite. In this context, novel infrastructures and techniques are being studied and experimented to reach an increased autonomy of the positioning and navigation services in...
Poster
Full-text available
The Lunar GNSS Receiver Experiment (LuGRE) is a bilateral project involving Agenzia Spaziale Italiana (ASI) and National Aviation and Space Administration (NASA). It foresees the launch of a GNSS receiver developed by the Italian company Qascom as a payload of a FireFly’s BlueGhost spacecraft directed to the Moon in 2023.
Article
Full-text available
Global Navigation Satellite System (GNSS) constitutes the foremost provider for geo-localization in a growing number of consumer-grade applications and services supporting urban mobility. Therefore, low-cost and ultra-low-cost, embedded GNSS receivers have become ubiquitous in mobile devices such as smartphones and consumer electronics to a large e...
Article
Full-text available
Optical Inter-Satellite Links (OISLs) are being considered for future Global Navigation Satellite System (GNSS) constellations. Thanks to OISLs, the constellation incorporates improved clock synchronization and precise ranging among the satellites, which are essential features to achieve accurate time and orbit determination. High data rate communi...
Conference Paper
The evolution and integration of communication networks and positioning technologies are evolving at a fast pace in the framework of vehicular systems. The mutual dependency of such two capabilities can enable several new cooperative paradigms, whose adoption is however slowed down by the lack of suitable open protocols, especially in the positioni...
Article
The growing applications involving unmanned aerial vehicles (UAVs) are requiring more advanced control algorithms to improve rotary-wing UAVs’ performance. To preliminarily tune such advanced controllers, an experimental approach could take a long time and also be dangerous for the vehicle and the onboard hardware components. In this paper, a simul...
Article
Full-text available
Tight integration algorithms fusing Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) have become popular in many high-accuracy positioning and navigation applications. Despite their reliability, common integration architectures can still run into accuracy drops under challenging navigation settings. The growing computa...
Conference Paper
Several navigation filters have been developed since the early steps of Global Navigation Satellite Systems (GNSS) to provide high-accuracy Positioning, Navigation and Timing (PNT), and many solutions are available in the literature to support a plethora of applications. In the context of vehicular navigation and positioning, advanced state estimat...
Preprint
In recent years positioning and navigation capabilities in mobile devices have become essential to the ever-growing number of position-related smart applications. Global Navigation Satellite System (GNSS) constitutes the provider for geo-localization, therefore consumer-grade, embedded GNSS receivers have become ubiquitous in mobile smart devices....
Preprint
div>In recent years positioning and navigation capabilities in mobile devices have become essential to the evergrowing number of position-related smart applications. Global Navigation Satellite System (GNSS) constitutes the provider for geo-localization, therefore consumer-grade, embedded GNSS receivers have become ubiquitous in mobile smart device...
Preprint
Full-text available
This letter presents a methodology to reduce the computational burden of Particle Filters (PF) used to achieve a target state estimation accuracy in Bayesian tracking problems. A strategy, named Multiple Weighting (MW), that exploits information diversity of the input measurements for an efficient weighting of the particles is introduced. This stud...
Article
Full-text available
Global Navigation Satellite Systems (GNSSs) are the most widespread technology for Position Navigation and Timing (PNT). They have been traditionally deployed exploiting Medium Earth Orbit (MEO) or Geosynchronous Orbit (GSO) satellites. To meet future demands and overcome MEO and GSO limitations, GNSSs based on Low Earth Orbit (LEO) constellations...
Conference Paper
Bayesian navigation filters are broadly exploited in precise state estimation for kinematic applications such as vehicular positioning and navigation. Among these, Particle Filter (PF) has been shown as a valuable solution to support hybrid positioning algorithms such as sensor fusion to Global Navigation Satellite System (GNSS) and Cooperative Pos...
Article
Full-text available
In the last few years, all countries worldwide have fought the spread of SARS-CoV-2 (COVID-19) by exploiting Information and Communication Technologies (ICT) to perform contact tracing. In parallel, the pandemic has highlighted the relevance of mobility and social distancing among citizens. The monitoring of such aspects appeared prominent for reac...
Poster
Bayesian estimation such as Sequential Monte Carlo methods (SMC) are broadly exploited in signal processing domain, and their effectiveness has been assessed in several fields. Among these, state estimation in radio-positioning and navigation has fueled an intense research effort in robotics and vehicular applications. In particular, Particle Filte...
Article
Full-text available
This paper describes a bioinspired neural-network-based approach to solve a coverage planning problem for a fleet of unmanned aerial vehicles exploring critical areas. The main goal is to fully cover the map, maintaining a uniform distribution of the fleet on the map, and avoiding collisions between vehicles and other obstacles. This specific task...
Conference Paper
Full-text available
This paper deals with the concept of GNSS meta-signal processing, defined as the coherent process of two GNSS signals, broadcast on different carriers, and treated as a single wideband signal. The purpose of the paper is twofold: to analyse the effects on non-idealities on the meta-signal components and to investigate alternative schemes for the ac...
Chapter
In this paper, a new three-dimensional path planning approach with obstacle avoidance for UAVs is proposed. The aim is to provide a computationally-fast on-board sub-optimal solution for collision-free path planning in static environments. The optimal 3D path is an NP (non-deterministic polynomial-time) hard problem which may be solved numerically...
Article
Full-text available
The advances in low-latency communications networks and the ever-growing amount of devices offering localization and navigation capabilities opened a number of opportunities to develop innovative network-based collaborative solutions to satisfy the increasing demand for positioning accuracy and precision. Recent research works indeed, have fostered...
Article
Full-text available
In urban contexts, the increasing density of electronic devices equipped with Global Navigation Satellite System (GNSS) receivers and complementary positioning technologies is attracting research and development efforts devoted to an improvement of the quality of life towards the smart city paradigm. Vehicular and pedestrian positioning and navigat...
Conference Paper
Full-text available
Global Navigation Satellite Systems (GNSSs) are by far the most widespread technology for Position Navigation and Timing (PNT). They have been traditionally deployed exploiting Medium Earth Orbit (MEO) or Geostationary Earth Orbit (GEO) satellite constellations. To meet future demands and overcome MEO and GEO limitations, GNSSs based on Low Earth O...
Article
Full-text available
Ionospheric scintillation is the physical phenomena affecting radio waves coming from the space through the ionosphere. Such disturbance is caused by ionospheric electron‐density irregularities and is a major threat in Global Navigation Satellite Systems (GNSS). From a signal‐processing perspective, scintillation is one of the most challenging prop...
Article
The articles in this special section focus on recent advancements on the use of the global navigation satellite system (GNSS)-based positioning for intelligent transport systems. The civil applications of geopositioning are undergoing exponential development. The latest market analysis for global navigation satellite systems (GNSSs) shows two major...
Conference Paper
This paper presents a machine learning model able to distinguish between ionospheric scintillation and multipath in GNSS-based scintillation monitoring data. The inputs to the model are the average signal intensity, the variance in the signal intensity, and the covariance between the in-phase and the quadrature-phase outputs of the tracking loop of...
Conference Paper
Rapid and sudden fluctuations of phase and amplitude in Global Navigation Satellite System (GNSS) signals due to diffraction of the ionosphere phase components when signals passing through small-scale irregularities (less than hundreds meters) are commonly so-called ionospheric scintillation. The aim of the paper is to analyze the implementation an...
Article
Full-text available
This paper provides a comparative performance analysis of different acquisition and tracking methods of GPS L1 C/A and GPS L5 signals testing their robustness to the presence of scintillations in the propagation environment. The paper compares the different acquisition methods in terms of probabilities of detection/false alarm, peak-to-noise floor...
Conference Paper
In this paper, we investigate the effects of spoofing attacks on the mass-market positioning and navigation units integrated in modern day Android™ smartphones. In order to operate spoofing in a real environment, we designed and implemented a portable, configurable, low-cost GPS spoofer exploiting a software-defined radio (SDR) implementation and a...
Article
Full-text available
With the fast growing diffusion of the real-time high accuracy applications based on the Global Navigation Satellite System (GNSS), the robustness of the GNSS receiver performance has become a compelling requirement. Disruptive effects can be induced to the signal processing stages of GNSS receivers due to the disturbances from Radio-Frequency Inte...
Article
Full-text available
This work focuses on a machine learning based detection of ionospheric scintillation events affecting Global Navigation Satellite System (GNSS) signals. We here extend the recent detection results based on Decision Trees, designing a semi-supervised detection system based on the DeepInfomax approach recently proposed. The paper shows that it is pos...
Article
Full-text available
Signals from global navigation satellite systems (GNSS) can be utilized as signals of opportunity in remote sensing applications. Geophysical properties of the earth surface can be detected and monitored by processing the back-scattered GNSS signals from the ground. In the literature, several airborne GNSS-based passive radar experiments have been...
Article
Full-text available
Previous research contributions have addressed the definition of a Cramer Rao Lower Bound (CRLB) to investigate the performance of hybrid positioning algorithms that exploit satellite-based range measurements and independent terrestrial range measurements. Starting from such results, this work investigates the quantity of information carried by ter...
Article
Full-text available
Scintillation caused by the electron density irregularities in the ionospheric plasma leads to rapid fluctuations in the amplitude and phase of the Global Navigation Satellite Systems (GNSS) signals. Ionospheric scintillation severely degrades the performance of the GNSS receiver in the signal acquisition, tracking, and positioning. By utilizing th...
Conference Paper
GNSS Reflectometry (GNSS-R) is a consolidated remote sensing technique that exploits the back-scattered GNSS signals to retrieve information about the Earth surface. By the use of GNSS-R sensors onboard UAVs, this tool can bring significant advantages in agriculture, especially for the detection of the presence of water/moisure in specific rural ar...
Conference Paper
The aim of this paper is to propose a multipath detection algorithm, which is based on K-means clustering that belongs to the class of unsupervised machine learning algorithms. The algorithm processes measurement sets computed for each satellite, namely, carrier phase, pseudorange and carrier-to-noise ratio, creating clusters of consistent measurem...
Conference Paper
The combination of ubiquitous network infrastructure and the high density of powerful, interconnected mobile devices in urban areas is driving the rise of smart cities. In parallel, the availability of ultra-low cost embedded Global Navigation Satellite System (GNSS) has enabled several affordable Location Based Services (LBS). New chipsets support...
Conference Paper
In the last decades, several positioning and navigation algorithms have been developed to enhance vehicular localization capabilities. Thanks to ad-hoc communication networks, the exchange of navigation data and positioning solutions has been exploited to the purpose. This trend has recently suggested the extension of state-of-the art navigation al...
Article
Following the issue by the Galileo Service Center of the Notice Advisory to Galileo Users (NAGU) reporting Service Outage for all the Galileo satellites, as curious Galileo users our team of researchers of the NavSAS group started an independent investigation of the received signals in space (SISs). Available at: https://www.gpsworld.com/why-gali...
Conference Paper
Full-text available
Cooperative positioning is considered a key strategy for the improvement of localization and navigation performance in harsh contexts such as urban areas. Modern communication paradigms can support the exchange of inter-vehicle ranges measured from on-board sensors or obtained through Global Satellite Navigation System (GNSS) measurements. The pape...
Article
Full-text available
The quality of positioning services based on Global Navigation Satellite Systems (GNSS) is improving at a fast pace, driven by the strict requirements of a plethora of new applications on accuracy, precision and reliability of the services. Nevertheless, ionospheric errors still bound the achievable performance and better mitigation techniques must...
Conference Paper
The aim of this paper is to analyze the design of support vector machine (SVM) algorithm that belongs to the class of supervised machine learning algorithms for phase scintillation detection and to discuss the performance comparison of linear and Gaussian kernel implementations by considering the design parameter’s effects. The algorithm processes...
Article
In the past few years, the rapid evolution of multi-constellation navigation satellite systems boosted the development of many scientific and engineering applications. More than 100 satellites will be available in a few years, when all the four global constellations (GPS, GLONASS, Galileo, and Beidou) will be fully deployed. This high number of vis...
Conference Paper
This paper addresses a comparative analysis of both amplitude and phase scintillation effects on the carrier tracking stages processing GPS L1 C/A, L5-data and L5-pilot signals. Robust architectures that are optimized to operate in a harsh ionospheric environment are considered. Traditional Phase-Locked Loop (PLL) and Kalman filter based-PLL carrie...
Conference Paper
This paper proposes an optimization of the characteristic parameters that define four architectures of adaptive notch filters, used to mitigate the effect of swept-frequency (chirp) jamming signals at the input of a GNSS receiver. The optimization is based on a performance metric computed at the acquisition stage of the receiver that represents a m...
Chapter
This chapter discusses the fundamentals of satellite navigation. It introduces the fundamentals of the global position estimation using time‐of‐arrival estimation of signals received from a cluster of satellites. The chapter assesses the impact of the satellite constellation geometry on the global positioning accuracy. It presents an overview of cu...
Article
This chapter presents strategies and techniques used to increase the sensitivity of global navigation satellite system (GNSS) receivers in order to make them usable in harsh environments, such as urban canyons, light indoor scenarios, deep forests, or space. It discusses the assistance that can be provided to the GNSS receiver through communication...
Article
Full-text available
Raw Global Navigation Satellite System (GNSS) measurements have been available since 2016 in select Android smartphones. The availability of such observations allows smartphones users, in principle, to significantly improve the quality of GNSS-based positioning by applying customized and advanced positioning algorithms. However, the quality of such...
Conference Paper
The use of Global Navigation Satellite Systems (GNSS) signals as signal of opportunity for ionospheric sounding is becoming quite popular. In particular, for scintillation monitoring, it is essential that the affected GNSS signal is not distorted by any other artificial interference. As a matter of fact, the Ionospheric Scintillation Monitoring Rec...
Conference Paper
Full-text available
Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) are nowadays widely integrated among mass-market devices, thus merging the benefits of satellite-based absolute positioning and continuity, low-noise and high-rate measurements from a variety of proprioceptive sensors. Other technologies such as Ultra-wideband (UWB), Lid...
Conference Paper
The aim of this paper is to present a comparative study of different acquisition methods tailored to the GPS L5, with the particular focus to test their robustness to the presence of phase and amplitude scintillations in the propagation environment. The study exploits real GNSS signal affected by significant phase and amplitude scintillation effect...
Article
Full-text available
In early September 2017, several space weather events triggered disturbed conditions of the near‐Earth space. The combination of two coronal mass ejection arrivals, associated with an X‐class flare, caused a strong geomagnetic storm on 7 and 8 September, thus inducing diffuse ionospheric phase scintillations on Global Navigation Satellite System (G...
Conference Paper
As the Global Satellite Navigation Systems (GNSS) signals are received and processed by the GNSS receivers with an extremely low power, they are vulnerable to non-intentional and intentional interference. In particular, the intentional transmission of Radio Frequency interference, known as jamming, can completely prevent the operation of GNSS recei...
Article
Full-text available
Global navigation satellite systems (GNSSs) are widely used to support logistics, scientific operations, and to monitor the polar ionosphere indirectly, which is a region characterized by strong phase scintillation events that severely affect the quality and reliability of received signals. Professional commercial GNSS receivers are widely used for...
Article
Full-text available
Global navigation satellite systems play a significant role in the development of intelligent transport systems, where the estimation of the vehicle’s position is a key element. However, in strongly constrained environments such as city centers, the definition of quality metrics and the assessment of positioning performances are challenges to be ad...
Article
Full-text available
This paper proposes a methodology for automatic, accurate and early detection of amplitude ionospheric scintillation events, based on machine learning algorithms, applied on big sets of 50 Hz post-correlation data provided by a GNSS receiver. Experimental results on real data show that this approach can considerably improve traditional methods, rea...
Conference Paper
In the field of Global Satellite Navigation System (GNSS), modern mass-market receivers are able to provide raw measurements, thus representing a valuable resource for the design of new navigation algorithms. Among these devices, a considerable amount of smartphones allows to gather such measurements before they are processed to compute the positio...
Article
Full-text available
This letter addresses the design and implementation of a monitoring station for Global Navigation Satellite Systems signals based on the software-defined radio paradigm. The monitoring platform exploits a digital data grabber based on the use of Universal Software Radio Peripheral devices and a satellite navigation fully software receiver; with res...
Conference Paper
Classical approaches for the automatic detection of ionospheric scintillation events in Global Navigation Satellite System (GNSS) receivers are based on the observation of indices (e.g. S4) that are obtained by processing parameters assessed at the signal processing stages of the receiver. Such values are the result of algorithms that imply specifi...
Conference Paper
Harsh environment is the main impediment to GNSS service availability due to the obstruction of line-of-sight between the satellites and the receiver. A well-known countermeasure to this issue is the exploitation of additional measurements integrated with the GNSS solution, addressed to assure the continuity of service or to improve the positioning...
Conference Paper
The limited availability and the lack of continuity in the service of Global Positioning Satellite Systems (GNSS) in harsh environments is a critical issue for Intelligent Transport Systems (ITS) applications relying on the position. This work is developed within the framework of vehicle-to-everything (V2X) communication, with the aim to guarantee...