A5100681440- Soil Moisture and Remote Sensing
- Precipitation Measurement and Analysis
- GNSS positioning and interference
- Ocean Waves and Remote Sensing
- Geophysics and Gravity Measurements
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Video Surveillance and Tracking Methods
- Cryospheric studies and observations
- Advanced Computational Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- Geological and Geochemical Analysis
- Inertial Sensor and Navigation
- Geochemistry and Geologic Mapping
- Hydraulic Fracturing and Reservoir Analysis
- Methane Hydrates and Related Phenomena
- Infrared Target Detection Methodologies
- Underwater Acoustics Research
- Remote Sensing and Land Use
- Advanced Neural Network Applications
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Metamaterials and Metasurfaces Applications
Institut d'Estudis Espacials de Catalunya
2016-2025
Consejo Superior de Investigaciones Científicas
2019-2025
Institute of Space Sciences
2016-2025
Shanghai Institute of Materia Medica
2024
University of Chinese Academy of Sciences
2024
Universitat Politècnica de Catalunya
2024
Northeast Electric Power University
2023
State Key Laboratory of Food Science and Technology
2022
Nanchang University
2022
Zhongnan Hospital of Wuhan University
2022
Abstract A track of sea ice reflected Global Navigation Satellite System (GNSS) signal collected by the TechDemoSat‐1 mission is processed to perform phase altimetry over ice. High‐precision carrier measurements are extracted from coherent GNSS reflections at a high angle elevation (>57°). The altimetric results show good consistency with mean surface (MSS) model, and root‐mean‐square difference 4.7 cm an along‐track sampling distance ∼140 m spatial resolution ∼400 m. observed between MSS...
This article assesses the ocean altimetry performance of spaceborne Global Navigation Satellite Systems reflectometry (GNSS-R) by processing raw data sets collected Cyclone GNSS (CYGNSS) constellation. These sets, i.e., intermediate frequency signal streams before any receiver processing, are processed on ground with a software receiver, from which reflected waveforms GPS L1, Galileo E1, and BeiDou-3 B1 band open service (OS) signals generated following conventional GNSS-R approach. By using...
Abstract This paper demonstrates inland water altimetry of spaceborne Global Navigation Satellite System‐Reflectometry (GNSS‐R) using the Cyclone GNSS (CYGNSS) mission data. From 12 tracks raw data overpassing Lake Qinghai, bistatic group delay and carrier phase are extracted from quasi‐specular reflections. The levels derived observations consistent with Cryosat‐2 in situ gauge measurements. surface topography profiles measurements show good self‐consistence along coincident tracks....
The precision of sea surface altimetry using bistatically reflected signals the Global Navigation Satellite System (GNSS) is typically one to two orders magnitude worse than dedicated radar altimeters. However, when scattering coherent, electromagnetic phase carrier signal can be tracked, providing precise ranging measurements. Under grazing angle (GA) geometries, conditions for coherent are maximized, enabling phase-delay altimetric techniques over waters. This work presents first...
This paper analyzes the ocean altimetry precision of global navigation satellite systems' reflectometry (GNSS-R) by characterizing noise statistics measured waveform. For this purpose, we first investigate dependence on observed waveform and then derive an analytical model after incoherent averaging. The main data set used for analysis validation is GPS L5 signals obtained from airborne experiment. Two different delay estimators, based leading-edge derivative (DER) fitting (FIT) over leading...
The global navigation satellite system (GNSS) Transpolar Earth Reflectometry exploriNg (G-TERN) was proposed in response to ESA's Explorer 9 revised call by a team of 33 multi-disciplinary scientists. primary objective the mission is quantify at high spatio-temporal resolution crucial characteristics, processes and interactions between sea ice, other components order advance understanding prediction climate change its impacts on environment society. articulated through three key questions....
Earth reflected Global Navigation Satellite System (GNSS) signals can be received by dedicated orbital receivers for remote sensing and observation (EO) purposes. Different spaceborne missions have been launched during the past years, most of which only provide delay-Doppler map (DDM) power GNSS as their main data products. In addition to DDM products, some these collected a large amount raw intermediate frequency (IF) data, are bit streams signal samples recorded after analog-to-digital...
The full constellation of Chinese Global Navigation Satellite System (GNSS) BeiDou-3 has been deployed completely and started fully operational service. In addition to providing global Positioning, Timing (PNT) services, the satellites transmissions can also be used as sources illumination for Earth Observation (EO) with a bistatic radar configuration. This innovative EO concept, known GNSS reflectometry (GNSS-R), allows measure surface characteristics at high resolution via reflected L-band...
Monitoring the dynamics and surface conditions of lakes is essential for understanding climate change dynamics. Lake water level one variables that needs a particular vigilance, requiring global consistent monitoring can be achieved by spaceborne remote sensing. Satellite radar altimetry has been widely used in inland waters past decades, with recent great improvements spatial resolution through new generation Synthetic Aperture Radar (SAR) altimeters. However, current constellations limits...
Radar altimetry provides valuable measurements to characterize the state and evolution of ice sheet cover Antartica Greenland. Global Navigation Satellite System Reflectometry (GNSS-R) has potential complement dedicated radar altimeters, increasing temporal spatial resolution measurements. Here we perform a study Greenland using data obtained by GNSS-R instrument aboard British TechDemoSat-1 (TDS-1) satellite mission. TDS-1 was primarily designed provide sea information such as surface...
Sea surface-reflected signals of global navigation satellite system (GNSS) were collected during a coastal experiment to evaluate the potential use these on typhoon investigation. This work focuses processing from BeiDou geostationary Earth orbit (GEO) satellites and assessing sensitivities waveform observables wind speed evolution typhoons. After raw samples, both delay- spectral-related are obtained complex waveforms then compared with in situ measurement two tropical cyclones. Results...
As a pilot mission for the Chinese global navigation satellite system reflectometry (GNSS-R) constellation, BuFeng-1 (BF-1) twin satellites A/B were launched on June 5th, 2019. Using three-month of sample data, this study presents first evaluation soil moisture (SM) estimations. The results show that surface reflectivity (SR) derived from BF-1 bistatic radar cross section (BRCS) correlates well with SM active passive (SMAP) (mean <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This paper presents a concept, "Cookie," for satellite particularly suited dense spatial sampling by future Global Navigation Satellite Systems (GNSS) remote sensing constellations. Solely based on the reception of direct and reflected signals transmitted GNSS, can provide observations Earth useful wide range scientific operational applications. The Cookie is capable receiving signals, in both right- left-hand circular polarizations, from any GNSS systems, virtually arrival direction upper...
Due to the launch of a number dedicated GNSS-R satellite missions during last years, there is potential raise research interest in this field. This paper presents an analysis and simulation tool for community: wavpy. More than just simple waveform simulator, library provides set object-oriented classes each different elements that characterize scenario. Then, user can focus on particular piece or, by exploiting their combined synergies, perform more comprehensive exercise.
Due to better video quality and higher frame rate, the performance of multiple object tracking issues has been greatly improved in recent years. However, real application scenarios, camera motion noisy per detection results degrade trackers significantly. High-speed high-quality are still urgent demand. In this paper, we propose a new tracker following popular tracking-by-detection scheme. We tackle problem with an optical flow network utilize auxiliary deal missing problem. Besides, use...
The bistatically reflected global navigation satellite systems (GNSS) signals have become an attractive tool for spaceborne ocean altimetry. interferometric processing that can exploit the full bandwidth of available GNSS without knowledge actual ranging codes was proposed PARIS IoD mission to improve precision. This letter presents a novel on-board method which utilizes interferometry partial signal components explore further improvement altimetry scheme extracting and procedure, GPS L1...
The Vision Meets Drone Multiple Object Tracking (MOT) Challenge 2019 is the second annual activity focusing on evaluating multi-object tracking algorithms drones, held in conjunction with 17-th International Conference Computer (ICCV 2019). Results of 12 submitted MOT collected drone-based dataset are presented. Meanwhile, we also report results 6 state-of-the-art algorithms, and provide a comprehensive analysis discussion results. all submissions publicly available at website:...