Advances in the development of micro-electromechanical systems (MEMS) have made possible fabrication cheap and small dimension accelerometers gyroscopes, which are being used many applications where global positioning system (GPS) inertial navigation (INS) integration is carried out, i.e., identifying track defects, terrestrial pedestrian navigation, unmanned aerial vehicles (UAVs), stabilization platforms, etc. Although these MEMS sensors low-cost, they present different errors, degrade...

Intentional interference in satellite navigation is becoming an increasing threat for modern systems relying on Global Navigation Satellite Systems (GNSS). In particular, critical applications such as aviation can be severely affected by un-detected and un-mitigated therefore management solutions are crucial to employed. Methods cope with intentional enclose detection, mitigation, classification, localization. This paper offers a comprehensive survey of methods developed the last four...

It is known that satellite radiolocalization was born in the military environment and originally conceived for defense purposes. Nevertheless, commercial explosion (dated to 20 years ago) of global positioning system (GPS) civil market (automotive, tourism, etc.) significantly changed original perspectives this technology. Another big change expected when other navigation systems (GNSSs) such as European Galileo or Chinese COMPASS become operational commercial. In fact, modern GNSSs are...

In a GNSS receiver the measure of C/N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is not only supplementary information provided to user together with PVT (position, velocity, time), but it also fundamental determine status tracking subsystems and control in critical environments. A classic approach estimate navigation known as narrowband-wideband power ratio method (NWPR). We investigate suitability different estimation methods,...

There are efforts worldwide to build and launch new Low Earth Orbit (LEO) satellites for a multitude of communication remote-sensing applications. The high number LEO soon be available, their relative proximity compared GNSS satellites, as well the potential Doppler-based positioning makes these systems good candidates future solutions, complement existing terrestrial navigation. Positioning, Navigation, Time (PNT), briefly referred LEO-PNT, can built either by reusing constellations signals...

Restoring the connectivity in emergency areas and providing NAV/COM services able to support coordinate rescue teams represent two of main telecommunication needs for efficient situation management. The SALICE (Satellite-Assisted LocalIzation Communication system Emergency services) Project aimed at identifying architecture most suitable solutions be adopted future integrated reconfigurable systems analyze their feasibility realistic scenarios. article analyzes proposed strategies...

This paper proposes a novel concept of "local integrity" suitable to Global Navigation Satellite System (GNSS) receivers in urban vehicular scenarios. The idea is take into account not only the system, but also environment nearby receiver its nominal conditions, exploiting potentialities offered by Vehicular Ad-hoc Network (VANET) infrastructure. In detail, potential availability multiple observations GNSS signals, taken different vehicles participating VANET, can be shared and combined...

Many infrastructures that shape our lifestyle depend on the GPS. Even though not used for positioning, these need GPS to derive a precise time synchronization necessary their operations. Examples are power distribution grids, gateways financial transactions, and telecommunication networks. However, receivers, more in general global navigation satellite system (GNSS) vulnerable interference. This makes GNSS-dependent prone errors. paper addresses vulnerability of GNSS receivers intentional...

With the fast growing diffusion of real-time high-accuracy applications based on global navigation satellite system (GNSS), robustness GNSS receiver performance has become a compelling requirement. Disruptive effects can be induced to signal processing stages receivers due disturbances from radio frequency interference (RFI), even leading complete outage positioning and timing service. A typical RFI threat signals is represented by portable jammers, which transmit swept-frequency (chirp) in...

The Public Observation (PO) test phase of the Galileo Open Service Navigation Message Authentication (OSNMA) signal is officially opened since November <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$15^{\text {th}}~2021$ </tex-math></inline-formula> , by European Union Agency for Space Programme (EUSPA). During this phase, any interested users allowed to access Signal in (SIS) testing purposes, while...

In this article the provision of integrated services from high-altitude platforms (HAPs) is discussed, and a flexible communication system for HAP-based communications identified analyzed, with particular attention to delivery broadband HAPs highspeed trains. The high coding gain required by proposed scenario achieved through adaptive concatenated schemes, while smart antennas operating beamforming algorithms are employed at ground stations. simulated performance based on multi-antenna model...

Global Navigation Satellite Systems (GNSS) broadcast signals for positioning and navigation, which can be also employed remote sensing applications. Indeed, the satellites of any GNSS seen as synchronized sources electromagnetic radiation, specific processing reflected back from ground used to estimate geophysical properties Earth's surface. Several experiments have successfully demonstrated GNSS-reflectometry (GNSS-R), whereas new applications are continuously emerging presently under...

The Software Defined Radio (SDR) technology, applied to the reception of Global Navigation Satellite Signals (GNSS), allows implementation a positioning device with high flexibility level. advantage is twofold: not only GNSS SDR receiver can be easily updated during its operational life, but it becomes an outstanding tool in prototyping innovative algorithms for signal processing and quality monitoring. These aspects have been key-drivers NGene fully software receiver, developed by NavSAS...

Adaptive notch filters (ANFs) have been widely investigated in literature for their low complexity and good performance, used many signal processing applications. More recently, they proven to be an effective solution against jamming interferences, considered more than ever a real threat Global Navigation Satellite System signals. This article focuses on specific family of ANF, where the adaptation algorithm is implemented as frequency-lock-loop (FLL), namely FLL-equivalent ANFs. It presents...

In this paper, the structure of a tracking loop with Extended Kalman Filter (EKF) is analyzed. Particular emphasis given to NCO update rule, which seldom mentioned or studied in previous literature. Furthermore, an EKF-based software receiver proposed including special modules dedicated initialization and maintenance loop. The architecture has been compared traditional one based on FLL/PLL+DLL architecture, benefit EKF within stage evaluated terms final positioning accuracy. Further tests...

Nowadays, the Global Navigation Satellite Systems (GNSS) technology is not primary means of navigation for civil aviation and Air Traffic Control, but its role increasing. Consequently, vulnerabilities GNSSs to Radio Frequency Interference, including dangerous intentional sources interference (i.e., jamming spoofing), raise concerns special attention also in field. This panorama urges figuring out effective solutions able cope with GNSS preserve safety operations. In frame a Single European...

During the past few decades, use of global navigation satellite systems (GNSSs) has become primary and sometimes only way providing a positioning, navigation, timing (PNT) solution for many outdoor applications. Further-more, GNSS is playing an important role on development smart cities Internet things (IoT) For this reason, seamless very crucial numerous PNT-dependent Unfortunately, technology that vulnerable to several threats. All these ingredients boil down need alternative PNT solutions...

The high level of flexibility achievable with software defined radio (SDR) technology generates interest in the industry mass market receivers, but represents also a valuable tool for research-oriented analysis. This paper exploits this last aspect and demonstrates how it is possible to assess performance different digital estimators C/N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (i.e., carrier power noise spectral density ratio)...

Thanks to advances in the development of Micro-Electromechanical Systems (MEMS), it has been possible fabricate small dimension and cheap accelerometers gyros, which are being used many applications where GPS/INS integration is carried out, as for example identify track defects, navigation, geo-referencing, agriculture, etc. Although these MEMS devices have a low-cost, they present different errors degrade accuracy navigation systems short period time. Therefore, suitable modelling necessary...

Today, more attention is paid to emergency systems and rescuer organizations due the increasing sensitivity natural disasters terrorist attacks. In this paper, we would consider feasibility of telecommunication technologies that can enhance interconnection between accident zones rescue teams. A novel philosophy inspired by Software Defined Radios proposed in order design a reconfigurable receiver for team assistance scenarios, which encompass some basic functionalities, i) spectrum sensing...