A5013877845- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Inertial Sensor and Navigation
- Solar and Space Plasma Dynamics
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Astronomical Observations and Instrumentation
- Advanced Frequency and Time Standards
- Stellar, planetary, and galactic studies
- Seismic Waves and Analysis
- Neural Networks and Applications
- Sensor Technology and Measurement Systems
- Cryospheric studies and observations
- Soil Moisture and Remote Sensing
- Environmental and Ecological Studies
- Satellite Communication Systems
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Electron and X-Ray Spectroscopy Techniques
Jiangnan University
2025
Universitat Politècnica de Catalunya
2015-2024
Yangtze Normal University
2024
Institut d'Estudis Espacials de Catalunya
2018-2024
FC Barcelona
1999-2024
European Space Research and Technology Centre
2023
National Observatory of Athens
2023
Istituto Nazionale di Geofisica e Vulcanologia
2023
National Observatory
2023
Institut de physique du globe de Paris
2023
In this work we present a simple technique to estimate the medium‐scale traveling ionospheric disturbances (MSTIDs) characteristics (such as occurrence, velocity, vertical propagation) with periods lower than 20 min and its application set of GPS data both temporally spatially representative (near one solar cycle four local networks in Northern Southern Hemispheres, respectively). Some main results presented paper are MSTIDs which occur at daytime winter nighttime summer, related terminator...
In the context of European Space Agency/European Operations Centre funded Study “GNSS Contribution to Next Generation Global Ionospheric Monitoring,” four ionospheric models based on GNSS data (the Electron Density Assimilative Model, EDAM; Ionosphere Monitoring Facility, IONMON v2; Tomographic model, TOMION; and Neustrelitz TEC Models, NTCM) have been run using a controlled set input data. Each model output has tested against differential slant (dSTEC) truth for high (May 2002) low...
In this paper, different aspects of the application second‐order ionospheric term (abbreviated as I 2 ) and its impact on geodetic estimates are studied. A method to correct GPS observations from effect is proposed. This provides a more accurate correction measurements (in some cases, it can even be 50% better) with respect other ways computing such effect. Moreover, applied routinely estimate parameters. Applying subdaily differential positioning, several relationships between deviation...
The paper reviews the current state of GNSS-based detection, monitoring and forecasting ionospheric perturbations in Europe relation to COST action ES0803 "Developing Space Weather Products Services Europe". weather research related studies require broad international collaboration sharing databases, developing analysis software models providing services. Reviewed is European GNSS data basis including services derived products such as Total Electron Content (TEC) radio scintillation indices....
In this work, an extension in latitude range and time span with respect previous studies on Medium Scale Traveling Ionospheric Disturbances (MSTID) propagation, is presented. So far they have been basically studied at mid for limited periods (less than few years) solar maximum conditions. This has possible due to the availability of local Global Positioning System (GPS) networks mid‐north hemisphere (California), mid‐south (New Zealand), high low latitudes (Alaska Hawaii), last 13, 11, 7 4...
Although vertical total electron content (VTEC) forecasting is still an open subject of research, the use predictions ionospheric state at a scale several days area increased interest. A global VTEC forecast product for two ahead, which based exclusively on actual Global Positioning System (GPS) data, has been developed in frame International Navigation Satellite Systems (GNSS) Service (IGS) Ionospheric Working Group (IGS Iono‐WG). The UPC prediction model Discrete Cosine Transform (DCT),...
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....
Abstract. The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is dedicated to providing high-quality data and high-accuracy products for Global Navigation Satellite System (GNSS) positioning, navigation, timing Earth observations. As one part real-time products, IGS combined Ionosphere Map (RT-GIM) has been generated by weighting RT-GIMs from ionosphere centers including Chinese Academy Sciences (CAS), Centre National d'Etudes Spatiales (CNES), Universitat Politècnica...
We present in this work the temporal evolution of three‐dimensional electron density at global scale during two ionospheric storms (October 18–19, 1995, and January 10, 1997) computed using only actual Global Positioning System data. The tomographic model is solved by means a Kaiman filtering with filter updating time 1 hour Sun‐fixed reference frame, resolution 10 × deg latitude/local 100 km height including also protonospheric component (eight layers). data set contains from International...
The influence of the ionosphere can be one main obstacles to GPS carrier phase ambiguity resolution in real‐time, particularly over long baselines. This is important all users requiring sub‐decimeter positioning, perhaps real time, especially with high geomagnetic activity or close Solar Maximum. Therefore, it desirable have a precise estimation ionospheric delay correct data. In this paper we asses real‐time tomographic model created using dual‐frequency data simultaneously collected...
GPS radio occultations allow the sounding of Earth's atmosphere (i.e. troposphere and ionosphere). The basic observable this technique is additional delay, due to refractivity index, a signal when passing through atmosphere. This delay proportional integrated refractivity, in such way that we can obtain an estimation vertical profiles using observations at different elevation angles by solving inverse problem. Traditionally, solution problem obtained Abel inversion algorithm assuming index...