Browsing by Author "Hernández Pajares, Manuel"
Now showing items 1-20 of 202
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A linear scale height Chapman model supported by GNSS occultation measurements
(2016-05)
Conference lecture
Open AccessGlobal Navigation Satellite Systems (GNSS) radio occultations allow the vertical sounding of the Earth's atmosphere, in particular, the ionosphere. The physical observables estimated with this technique permit to test ... -
A new method for ionospheric tomography and its assessment by ionosonde electron density, GPS TEC, and single-frequency PPP
(Institute of Electrical and Electronics Engineers (IEEE), 2019-01-05)
Article
Open AccessA new tomographic method was developed with the main goal of mapping the ionosphere in the region of Brazil. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the ... -
A new method of electron density retrieval from MetOp-A’s truncated radio occultation measurements
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-03)
Article
Open AccessThe radio occultation (RO) measurements of the Global Navigation Satellite System’s (GNSS’s) signals onboard a Low Earth Orbiting (LEO) satellite enable the computation of the vertical electron density profile from the LEO ... -
A new method to determine the optimal thin layer ionospheric height and its application in the polar regions
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-06-23)
Article
Open AccessIn this paper, a feasibility study of a microwave antenna-based sensor is proposed for in vitro experiments for monitoring blood glucose levels. The proposed device consists of a square-ring incorporated within a fully ... -
A New way of estimating the spatial and temporal components of the vertical total electron content gradient based on UPC-IonSAT global ionosphere maps
(2022-02)
Article
Open AccessThe determination of the ionospheric perturbation degree is essential to describe the ionosphere state for space weather monitoring. A new method for estimating the spatial and temporal components of the Vertical Total ... -
A new way of improving global ionospheric maps by ionospheric tomography: consistent combination of multi-GNSS and multi-space geodetic dual-frequency measurements gathered from vessel-, LEO- and ground-based receivers
(2020-08)
Article
Restricted access - publisher's policyIn this work, we introduce a new way of improving the sligthly best performing global ionospheric model (GIM) within the International GNSS Service, the UQRG produced by UPC-IonSAT with the TOMION dual-layer voxel model ... -
A review of higher order ionospheric refraction effects on dual frequency GPS
(2010-11-26)
Article
Restricted access - publisher's policyAbstract Higher order ionospheric effects are increasingly relevant as precision requirements on GPS data and products increase. The refractive index of the ionosphere is affected by its electron content and the magnetic ... -
ADDTID: An alternative tool for studying earthquake/tsunami signatures in the ionosphere. Case of the 2011 Tohoku earthquake
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-13)
Article
Open AccessTraveling Ionospheric Disturbances (ADDTID) algorithm. This algorithm automatically detects and characterizes Traveling Ionospheric Disturbances (TIDs) from Global Navigation Satellite System (GNSS) measurements. Applying ... -
Application of tomographic ionospheric corrections in WADGPS networks for real-time estimation of integrated water vapour
(Instituto de Navegacion de España, 2021)
Conference report
Open AccessIn recent years several authors have developed strategies that estimate the Integrated Water Vapor (IWV), proportional to the Zenith Tropospheric Delay (ZTD), in near real time --i.e. with a delay of one hour or more--. ... -
Assessment of centre national d'Études spatiales real-time ionosphere maps in instantaneous precise real-time kinematic positioning over medium and long baselines
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-04-17)
Article
Open AccessPrecise real-time kinematic (RTK) Global Navigation Satellite System (GNSS) positioning requires fixing integer ambiguities after a short initialization time. Originally, it was assumed that it was only possible at a ... -
Assessment of global ionospheric maps performance by means of ionosonde data
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-10-21)
Article
Open AccessThis work presents a new method for assessing global ionospheric maps (GIM) using ionosonde data. The method is based on the critical frequency at the F2 layer directly measured by ionosondes to validate VTEC (vertical ... -
Assessment of GRAS ionospheric measurements for ionospheric model assimilation
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-15)
Article
Open AccessWe conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products. The ... -
Assessment of St. Patrick's Day 2015 Geomagnetic storm impact on EGNOS
(European Space Agency (ESA), 2015)
Conference lecture
Restricted access - publisher's policyThe Monitor project has been designed to monitor ionospheric events that would allow evaluating its impact on European GNSS Systems. It includes a network of ionospheric scintillation monitoring stations in various ... -
Assessment of the capabilities and applicability of ionospheric perturbation indices provided in Europe
(2020-08-01)
Article
Open AccessPerturbations in the ionosphere are of great interest not only for scientific research, but also for applications using transionospheric radiosignals (e.g. GNSS applications and HF communication), because the transmission ... -
Assessment of the F2-layer electron density peak inferred from Formosat-3/COSMIC radio occultations over half a Solar Cycle
(2016)
Conference report
Restricted access - publisher's policyGNSS radio occultation (RO) measurements have become crucial to provide valuable information on the vertical electron density structure of the Ionosphere. Ionospheric key parameters such as the maximum electron density ... -
Characterization and modelling of the ionosphere for EGNOS development and qualification
(2013)
Conference lecture
Restricted access - publisher's policyThe availability of representative data samples, models and statistical information derived from the analysis of parameters that adequately describe the state of the ionosphere are key elements for the design, verification ... -
Classifing stars: a comparison between clasical, genetic and neural network algorithms
(F. MURTAGH AND A. HECK, 1992)
Conference report
Open Access -
Climatology and modeling of ionospheric irregularities over Greenland based on empirical orthogonal function method
(EDP Sciences, 2022-05-31)
Article
Open AccessThis paper addresses the long-term climatology (over two solar cycles) of total electron content (TEC) irregularities from a polar cap station (Thule) using the rate of change of the TEC index (ROTI). The climatology reveals ... -
Coincident observations by the Kharkiv IS radar and ionosonde, DMSP and Arase (ERG) satellites, and FLIP model simulations: implications for the NRLMSISE-00 hydrogen density, plasmasphere, and ionosphere
(2018-08)
Article
Open AccessThis paper reports the results of ionosphere and plasmasphere observations with the Kharkiv incoherent scatter radar and ionosonde, Defense Meteorological Satellite Program, and Arase (ERG) satellites and simulations with ... -
Combining Swarm Langmuir probe observations, LEO-POD-based and ground-based GNSS receivers and ionosondes for prompt detection of ionospheric earthquake and tsunami signatures: Case study of 2015 Chile-Illapel event
(2021-12-08)
Article
Open AccessThe study investigates ionospheric electric field responses to the earthquake (EQ) of magnitude 8.3, and the related seismic activity and tsunami triggered by the mainshock in Chile-Illapel region, at 22:54 UTC, in the ...
