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View article: Magnetohydrodynamic effects on radio signal propagation in a plasma flow
Magnetohydrodynamic effects on radio signal propagation in a plasma flow Open
The plasma around a reentry spacecraft causes the charged particles to interact with the electromagnetic waves emitted by the on-board antennas, and the vehicle experiences radio communication difficulties. A proposed way to mitigate the r…
View article: A Novel AI-Based Framework for Forecasting Root-Zone Soil Moisture and Optimizing Irrigation Strategies Using the AI4WATER Digital Twin
A Novel AI-Based Framework for Forecasting Root-Zone Soil Moisture and Optimizing Irrigation Strategies Using the AI4WATER Digital Twin Open
Global warming intensifies water scarcity, posing significant challenges to sustainable agriculture worldwide. As rising temperatures and shifting precipitation patterns exacerbate drought conditions, the need for timely and effective irri…
View article: Exploring Multiscale Causal Interventions for Burned Area Estimation
Exploring Multiscale Causal Interventions for Burned Area Estimation Open
Understanding complex causal interactions between local, continental, and global drivers remains a significant challenge in wildfire prediction systems. This study implements a causal inference framework combining the Peter-Clark momentary…
View article: Advances in Soil Moisture Mapping Techniques and Disaggregation Algorithms for Environmental and Agricultural Applications
Advances in Soil Moisture Mapping Techniques and Disaggregation Algorithms for Environmental and Agricultural Applications Open
Soil moisture (SM) is a critical variable for understanding the water cycle, climate change, and agricultural management. This paper reviews advanced remote sensing techniques and disaggregation algorithms for high-resolution SM mapping, f…
View article: Adaptive near Real-Time RFI Mitigation Using Karhunen–Loève Transform
Adaptive near Real-Time RFI Mitigation Using Karhunen–Loève Transform Open
This paper presents a near real-time implementation of the Karhunen–Loève Transform (KLT) for Radio Frequency Interference (RFI) mitigation in microwave radiometry. KLT is a powerful, data-adaptive technique capable of adjusting to various…
View article: Global correlation of Swarm satellites magnetic field and TEC data with M4+ earthquakes between 2014 and 2024
Global correlation of Swarm satellites magnetic field and TEC data with M4+ earthquakes between 2014 and 2024 Open
Between 50 and 80 earthquakes are recorded daily, resulting in over 20,000 yearly seismic events. Currently, no reliable earthquake precursors can provide an early warning. Still, research has inspected anomalies in the Magnetic Field Vect…
View article: Architecting CubeSat constellations for messaging service, Part II
Architecting CubeSat constellations for messaging service, Part II Open
Data collection and exchange stand as a cornerstone technology driving the advancement of technological development over recent decades. However, many remote and hard-to-reach regions remain devoid of terrestrial communication infrastructu…
View article: A Novel SDR-Based P-Band PRN Radar With Real Time Range Compression and Coherent Integration
A Novel SDR-Based P-Band PRN Radar With Real Time Range Compression and Coherent Integration Open
Active microwave remote sensing at P-band offers the potential to map vegetation biomass and subsurface soil moisture. This paper presents the development of a novel Software-Defined Radio (SDR)-based Pseudo-Random Noise (PRN) radar operat…
View article: An SDR-Based GNSS-R CubeSat Payload: Hardware Development and Optimization of the Onboard Processing
An SDR-Based GNSS-R CubeSat Payload: Hardware Development and Optimization of the Onboard Processing Open
Recent developments in high-performance Software Defined Radios (SDRs) and their utilization in CubeSat payloads are transforming Earth Observation (EO), including Microwave Radiometers, Global Navigation and Satellite System – Radio Occul…
View article: A Novel Geometry Agnostic Delay and Doppler Tracking Technique for GNSS-Reflectometry: Application to the GNOS-II Payload Onboard the FY-3E
A Novel Geometry Agnostic Delay and Doppler Tracking Technique for GNSS-Reflectometry: Application to the GNOS-II Payload Onboard the FY-3E Open
Global Navigation Satellite System-Reflectometry (GNSS-R) uses GNSS signals as signals of opportunity as a multistatic radar. Most GNSS-R instruments conduct 1 ms coherent integration, followed by 500 or 1000 incoherent averages, leading t…
View article: Multiparameter Causal Models for the Estimation and Explainability of Wildfire Burned Area
Multiparameter Causal Models for the Estimation and Explainability of Wildfire Burned Area Open
Understanding the causal relationships among local, continental, and global variables is crucial for improving the accuracy and reliability of wildfire estimation. However, uncovering these complex interactions remains a challenge in wildf…
View article: S-Band CCSDS Compatible Transmitter Communications Layer for CubeSats
S-Band CCSDS Compatible Transmitter Communications Layer for CubeSats Open
The Remote sensing and Interference detector with radiomeTry and vegetation Analysis (RITA) is an Earth Observation (EO) payload developed by the Universitat Politècnica de Catalunya (UPC) NanoSat Lab, winner of the Second IEEE GRSS Studen…
View article: Resource-Efficient FPGA Architecture for Real-Time RFI Mitigation in Interferometric Radiometers
Resource-Efficient FPGA Architecture for Real-Time RFI Mitigation in Interferometric Radiometers Open
Interferometric radiometers operating at L-band, such as ESA’s SMOS mission, enable crucial Earth observations providing high-resolution measurements of soil moisture, ocean salinity, and other geophysical parameters. However, the increasi…
View article: Sensitivity Study of Multiconstellation GNSS-R to Soil Moisture and Surface Roughness Using FY-3E GNOS-II Data
Sensitivity Study of Multiconstellation GNSS-R to Soil Moisture and Surface Roughness Using FY-3E GNOS-II Data Open
The potential of spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) to retrieve a variety of geophysical parameters has already been demonstrated in numerous studies. In 2021, China successfully launched the Fengyun-3E (F…
View article: 3Cat-8 Mission: A 6-Unit CubeSat for Ionospheric Multisensing and Technology Demonstration Test-Bed
3Cat-8 Mission: A 6-Unit CubeSat for Ionospheric Multisensing and Technology Demonstration Test-Bed Open
This paper presents the mission analysis of 3Cat-8, a 6-Unit CubeSat mission being developed by the UPC NanoSat Lab for ionospheric research. The primary objective of the mission is to monitor the ionospheric scintillation of the aurora, a…
View article: Statistical Analysis of LEO and GEO Satellite Anomalies and Space Radiation
Statistical Analysis of LEO and GEO Satellite Anomalies and Space Radiation Open
Exposure to space radiation substantially degrades satellite systems, provoking severe partial or, in some extreme cases, total failures. Electrostatic discharges (ESD), single event latch-up (SEL), and single event upsets (SEU) are among …
View article: Diurnal Vegetation Moisture Cycle in the Amazon and Response to Water Stress
Diurnal Vegetation Moisture Cycle in the Amazon and Response to Water Stress Open
Water stress in the Amazon is exacerbated by rising temperatures and reduced moisture levels. However, understanding forest responses to increased aridity is hindered by limited in situ water potential observations in the Amazon. Remote se…
View article: The 3Cat-4 Spacecraft Thermal Analysis and Thermal Vacuum Test Campaign Results
The 3Cat-4 Spacecraft Thermal Analysis and Thermal Vacuum Test Campaign Results Open
3Cat-4 is the fourth member of the CubeSat series of UPC’s NanoSat Lab, and it was selected by the ESA Academy’s Fly Your Satellite! program in 2017. This mission aims at demonstrating the capabilities of nano-satellites, and in particular…
View article: Preliminary Design of Satellite Systems through the Integration of Model-Based System Engineering and Agile Methodologies: Application to the 3ColStar Mission
Preliminary Design of Satellite Systems through the Integration of Model-Based System Engineering and Agile Methodologies: Application to the 3ColStar Mission Open
This paper presents a case study on integrating Agile Systems Engineering methodologies in the preliminary design phase of satellite systems, focusing on the 3ColStar satellite mission. Through Model-Based Systems Engineering (MBSE), techn…
View article: Architecting CubeSat constellations for messaging service, Part I
Architecting CubeSat constellations for messaging service, Part I Open
In today’s modern and globalized world, connectivity is a key factor for businesses, production facilities, sensor networks, and ordinary people. However, there are still populated areas which are not covered by ground-based telecommunicat…
View article: GNSS-R Payload for Small Satellites: Design and Optimization Using Auxiliary Information
GNSS-R Payload for Small Satellites: Design and Optimization Using Auxiliary Information Open
Earth Observation (EO) using Signals of Opportunity (SoOp), the advent of high-performance and customizable Software Defined Radios (SDRs), and small satellites are revolutionizing today many Remote Sensing techniques. One of the most wide…
View article: A Method for Correcting the GPS Navigation Bit Transitions in the FY-GNOS-II GNSS-R Payload
A Method for Correcting the GPS Navigation Bit Transitions in the FY-GNOS-II GNSS-R Payload Open
Global Navigation Satellite System Reflectometry (GNSS-R) is a remote sensing technology that uses GNSS signals reflected over Earth’s surface, offering advantages such as high spatio-temporal resolution and cost-effectiveness. GPS navigat…
View article: Bayesian Network Analysis of Land-Atmosphere Interactions Affecting Burned Areas in India During the 2022 South Asia Heatwave
Bayesian Network Analysis of Land-Atmosphere Interactions Affecting Burned Areas in India During the 2022 South Asia Heatwave Open
IEEE International Geoscience and Remote Sensing Symposium (IEEE IGARSS 2024), Acting for Sustainability and Resilience, 7-12 July 2024, Athens, Greece.-- 4 pages
View article: Sensitivity of the Brightness Temperature to Soil Moisture as a Function of Depth, Frequency, Polarization and Incidence Angle
Sensitivity of the Brightness Temperature to Soil Moisture as a Function of Depth, Frequency, Polarization and Incidence Angle Open
ESA SMOS and NASA SMAP missions are measuring surface soil moisture (SM) globally from space using L-band microwave radiometers. Many studies have been conducted to validate the quality of these SM retrievals using data from different SM n…
View article: First Experimental Results of a K-Band RFI Detection Payload for Pocketqubes
First Experimental Results of a K-Band RFI Detection Payload for Pocketqubes Open
Radio Frequency Interference (RFI) are disturbing signals in the radio frequency spectrum, which can arise from various external sources, intentional or not. These disturbances can degrade the performance of other signals present in the ba…