Browsing by Subject "Geophysics"
Now showing items 1-20 of 95
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A comparison of phase unwrapping techniques in synthetic aperture radar interferometry
(Institute of Electrical and Electronics Engineers (IEEE), 1999)
Conference report
Open AccessA comparison of different phase unwrapping techniques based on the least mean square error is presented. A testing environment based on simulated interferograms has been created in order to assess the methods described in ... -
An adaptive multiresolution method for speckle noise reduction in synthetic aperture radar images
(Institute of Electrical and Electronics Engineers (IEEE), 1999)
Conference report
Open AccessThis paper introduces a method for speckle noise reduction based on multiresolution algorithms and a new adaptive approach. It combines the characteristics for additive noise reduction of soft thresholding with the ... -
Analysis and calibration of Ground Penetrating Radar shielded antennas
(2018)
Conference report
Open AccessGround-Penetrating Radar (GPR) is a non-destructive geophysical method applied in many civil engineering applications. The knowledge of the GPR antennas behavior is crucial to obtain accurate results and comprehensive data ... -
Analysis of satellite constellations for the continuous coverage of ground regions
(2017-11-01)
Article
Open AccessThis paper studies the problem of analyzing multisatellite constellations with respect to their coverage capacity of areas on Earth’s surface. The geometric configuration of constellation projection points on Earth’s surface ... -
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), 2018-01-01)
Article
Restricted access - publisher's policyA 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 spectral analysis algorithm for SAR data processing of ScanSAR data and medium resolution data without interpolation
(Institute of Electrical and Electronics Engineers (IEEE), 1998)
Conference report
Open AccessThis paper describes a new approach for ScanSAR data image generation, which performs efficient data processing and multilook operation without the need of interpolation stages. This new technique is based on the spectral ... -
A novel reconstruction algorithm for the improvement of SMOS brightness temperatures
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference report
Restricted access - publisher's policyRFI (Radio Frequency Interference) sources, Sun signal and even land-sea transitions may generate large sidelobes that corrupt SMOS brightness temperature products and therefore, the quality of the soil moisture and sea ... -
A Parallel Tool for Numerical Approximation of 3D Electromagnetic Surveys in Geophysics
(Instituto Politécnico Nacional (México), 2016)
Article
Open AccessThis paper presents an edge-based parallel code for the data computation that arises when applying one of the most popular electromagnetic methods in geophysics, namely, the controlled-source electromagnetic method (CSEM). ... -
Aplicació de diferents tècniques geofísiques per a la caracterització geotècnica del terreny
(Universitat Politècnica de Catalunya, 2019-07-11)
Bachelor thesis
Open AccessMitjançant diferents tècniques geofísiques, com ara, la tomografia elèctrica, sísmica de refracció i sísmica passiva; es podrà realitzar una caracterització del terreny, obtenint informació sobre la resistivitat, estratigrafia, ... -
Application of reduced order modelling in geophysics
(Barcelona Supercomputing Center, 2017-05-04)
Conference report
Open AccessThe main objective of this work is to effectively design an apriori Reduce Order Method solver to solve parametric high dimensional geophysical problems in a cost effective and fast manner. -
Applications of GPR in association with other non-destructive-testing methods in building assessment and in geological/geotechnical tasks. State of the art and open issues
(2014)
Conference lecture
Open AccessGeophysics is the study of the earth’s interior, using measurements based on physics principles. A part of this, geophysics is also used to explore the interior of construction materials of buildings and Monuments. The ... -
Assessing the suitability of video imaging for studying the Dynamics of nearshore sandbars in tideless beaches
(Institute of Electrical and Electronics Engineers (IEEE), 2010)
Article
Restricted access - publisher's policyNearshore sandbars, an important natural defense mechanism of the beaches, can be monitored using shore-based video systems. Before studying bar dynamics with video images, we must establish the relationship between the ... -
Assessment of edge-based finite element technique for geophysical electromagnetic problems: efficiency, accuracy and reliability
(International Center for Numerical Methods in Engineering (CIMNE), 2015-04)
Conference lecture
Open AccessIn Finite Element Methods for solving electromagnetic field problems, the use of Edge Elements has become very popular. In fact, Edge Elements are often said to be a cure to many difficulties that are encountered (particularly ... -
Assessment of lidar inversion errors for homogeneous atmospheres
(OPTICAL SOC AMER, 1998-04-30)
Article
Open AccessThe inversion of lidar returns from homogeneous atmospheres has been done customarily through the well-known slope method. The logarithmic operation over the range-corrected and system-normalized received signal used in ... -
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 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 ... -
Automated GPS Signal-in-Space anomalies monitoring over more than 11 years
(ION Publications (The Institute of navigation), 2019)
Conference report
Restricted access - author's decision -
Calibration procedures in 2-D large interferometric radiometers study applied to the MIRAS/SMOS instrument
(2000)
Conference report
Open Access -
Chaotic advection, transport and patchiness in clouds of pollution in an estuarine flow
(American Institute of Mathematical Sciences, 2001)
Article
Open AccessWe present an application of the transport theory developed for area preserving dynamical systems, to the problem of pollution and in particular patchiness in clouds of pollution in partially stratified estuaries. We ... -
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 ...
