RFI Mitigation & GNSS Security

Protocol-Aware Jamming and Self-Play Defense for Active RIS-Assisted UAV Communications

This research contribution by Selma Yahia, Ildi Alla, Hossien B. Eldeeb, Marcele O. K. Mendonça et al. (2026), published in IEEE International Symposium on Personal, Indoor and …

selma-yahia
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High-Accuracy Ranging in 5G Non-Terrestrial Networks: Receiver Architectures and Interference Analysis

This research contribution by Idir Edjekouane, Alejandro González-Garrido, Jorge Querol, José A. del Peral-Rosado et al. (2026), published in IEEE Transactions on Vehicular …

idir-edjekouane
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Automatic RFI Detection, Location, and Classification System in GNSS Bands featured image

Automatic RFI Detection, Location, and Classification System in GNSS Bands

Global Navigation Satellite Systems (GNSS) are critical infrastructure components in modern Positioning, Navigation, and Timing (PNT) services, playing a vital role in both …

adrian-perez-portero
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Resource-Efficient FPGA Architecture for Real-Time RFI Mitigation in Interferometric Radiometers

Interferometric radiometers operating at L-band, such as ESA's SMOS mission, enable crucial Earth observations providing high-resolution measurements of soil moisture, ocean …

adrian-perez-portero
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Development of a Dynamically Re-Configurable Radio-Frequency Interference Detection System for L-Band Microwave Radiometers

Real-Time RFI Detection and Flagging (RT-RDF) for microwave radiometers is a versatile new FPGA algorithm designed to detect and flag Radio-Frequency Interference (RFI) in …

adrian-perez-portero
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Interference analysis of Positioning Reference Signals in 5G NTN

Accurate asset localization holds paramount importance across various industries, ranging from transportation management to search and rescue operations. In scenarios where …

alejandro-gonzalez-garrido
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Interference Analysis and Modeling of Positioning Reference Signals in 5G NTN

The integration of Positioning, Navigation, and Timing (PNT) services within the 5G non-terrestrial networks (NTN) infrastructure is necessary to eliminate the need for a GNSS …

alejandro-gonzalez-garrido
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Classification and Characterization of RFI Events for Passive Earth Observation Bands

Passive Microwave remote sensing is a very energy-efficient and time-proven technology for remote sensing. Microwave Radiometry and Global Navigation Satellite System …

adrian-perez-portero
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Radio Communication Blackout Mitigation: Ray Tracing Analysis and Signal Characterization Including Experimental Validation for Non-magnetized Plasmas

Atmospheric entries and hypersonic flights are challenging. The bow shock in front of the vehicle and friction heat the gas flow around the vehicle and result in the ionization of …

johannes-laur
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Doppler effect mitigation in LEO-based 5G non-terrestrial networks

In recent years, integrating Non-Terrestrial Networks (NTN) components with 5G Terrestrial Networks (TN) has led to considerable attention from academia and industry, leading to …

ashish-kumar-meshram
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RFI detection and mitigation for advanced correlators in interferometric radiometers featured image

RFI detection and mitigation for advanced correlators in interferometric radiometers

This work presents the first RFI detection and mitigation algorithm for the interferometric radiometers that will be implemented in its correlator unit. The algorithm operates in …

adrian-perez-portero
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A pre-correlation RFI mitigation algorithm for L-band interferometric radiometers

Radio Frequency Interference (RFI) is a major concern for both real and synthetic aperture radiometers. After the lessons learnt from SMOS, ESA is preparing the next generation of …

jorge-querol
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Radio-frequency interference location, detection and classification using deep neural networks

Global Navigation Satellite System (GNSS) signals are used in Earth Observation for Radio Occultation and Reflectometry. The increasing effects of Radio-Frequency Interferences …

a.-perez
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Real-time Radio Frequency Interference Detection and Mitigation with the Front-End GNSS Interference eXcisor (FENIX)

This paper presents the real-time hardware architecture and experimental evaluation of the Front-End GNSS Interference eXcisor (FENIX), demonstrating standalone pre-correlation …

jorge-querol
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On the new architecture and capabilities of the front-end GNSS interference excisor (FENIX)

The number of applications based on Global Navigation Satellite Systems (GNSS) has been increasing in the last years. With its proliferation, Radio-Frequency Interference (RFI) has …

adrian-perez
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A review of RFI mitigation techniques in microwave radiometry

Radio frequency interference (RFI) is a well-known problem in microwave radiometry (MWR). Any undesired signal overlapping the MWR protected frequency bands introduces a bias in …

jorge-querol
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Radio frequency interference detection and mitigation techniques for navigation and Earth observation

This PhD thesis is devoted to the design, implementation, and experimental validation of innovative Radio-Frequency Interference (RFI) detection, localization, and mitigation …

jorge-querol
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RFI analysis and mitigation in airborne GNSS-R campaign

Radio-Frequency Interference (RFI) is one of the most concerning topics in Global Navigation Satellite Systems (GNSS) and GNSS - Reflectometry (GNSS-R) because any undesired signal …

jorge-querol
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An anti-jamming system for GNSS timing applications

Radio-Frequency Interference (RFI) and jamming are increasing problems for timing applications based on Global Navigation Satellite Systems (GNSS). FENIX-lite is a real-time …

jorge-querol
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A radio-frequency interference detector for GNSS navigation and GNSS-reflectometry applications

This paper presents a real-time Radio-Frequency Interference (RFI) detection and monitoring system designed for Global Navigation Satellite Systems (GNSS) navigation and …

jorge-querol
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System and method for detecting and eliminating radio frequency interferences in real time

This research contribution by Jorge Querol, Adriano Joséé Camps Carmona (2017), published in international conference proceedings, investigates "System and method for detecting and …

jorge-querol
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Real-time Pre-correlation Anti-jamming System for Civilian GNSS Receivers

Global Navigation Satellite Systems (GNSS) have become a key technology that enables numerous location and navigation applications, thanks to the 24/7 worldwide availability of …

jorge-querol
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Performance assessment of time--frequency RFI mitigation techniques in microwave radiometry

Radio-frequency interference (RFI) signals are a well-known threat for microwave radiometry (MWR) applications. In order to alleviate this problem, different approaches for RFI …

jorge-querol
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MERITXELL: the Multifrequency Experimental Radiometer with Interference Tracking for Experiments over Land and Littoral—instrument description, calibration and performance

MERITXELL is a ground-based multisensor instrument that includes a multiband dual-polarization radiometer, a GNSS reflectometer, and several optical sensors. Its main goals are …

jorge-querol
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SNR degradation in GNSS-R measurements under the effects of radio-frequency interference

Radio-frequency interference (RFI) is a serious threat for systems working with low power signals such as those coming from the global navigation satellite systems (GNSS). The …

jorge-querol
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Preliminary results of FENIX: front-end GNSS interference eXcisor

The number of applications based on Global Navigation Satellite Systems (GNSS) has been increasing in last years. In the passive remote sensing field, GNSS-Reflectometry (GNSS-R) …

jorge-querol
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Comparison of real-time time-frequency RFI mitigation techniques in microwave radiometry

Radio-Frequency Interference (RFI) is a well-known problem for Microwave Radiometers (MWR). A number of RFI mitigation techniques have been studied to deal with RFI from the …

jorge-querol
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Assessment of DME/TACAN RFI mitigation techniques in GNSS-R

Global Navigation Satellite Systems Reflectometry (GNSSR) is now being recognized as a powerfull tool for remote sensing. With the addition of new frequency bands and codes, it is …

r.-onrubia
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Assessment of back-end RFI mitigation techniques in passive remote sensing

Radio-Frequency Interference (RFI) is a growing problem specially for those systems that work with low power signals such as passive remote sensing instruments. Consequently, RFI …

jorge-querol
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Study of RFI signals in protected GNSS bands generated by common electronic devices: Effects on GNSS-R measurements

RFI (Radio Frequency Interference) signals are a threat for GNSS-R (Global Navigation Satellite Systems - Reflectometry) due to the very low power of the navigation signals. …

jorge-querol
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Real-time RFI detection and mitigation system for microwave radiometers

Microwave radiometers are very sensitive passive sensors that measure the power of the thermal noise within a determined bandwidth. Therefore, any other signal present in the band …

giuseppe-f.-forte
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Implementation of Radio-Frequency Interference Detection and Mitigation Algorithms for Communications and Navigation

Radio-Frequency Interference (RFI) signals are undesired signals that degrade or disrupt the performance of wireless communications and satellite navigation receivers. This Master …

jorge-querol
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Digital back-end for RFI detection and mitigation in earth observation

A powerful real time Radio-frequency interference (RFI) mitigation back-end system is presented in this work. The interfering signals are estimated by using the wavelet transform …

g.f.-forte
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