Browsing by Subject "Geophysics"
Now showing items 1-20 of 141
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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 ... -
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 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 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 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 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). ... -
A reduced order approach for probabilistic inversions of 3D magnetotelluric data II: joint inversion of MT and surface-wave data
(2021-12)
Article
Open AccessJoint probabilistic inversions of magnetotelluric (MT) and seismic data have great potential for imaging the thermochemical structure of the lithosphere as well as mapping fluid/melt pathways and regions of mantle metasomatism. ... -
A scalable method to construct compact road networks from GPS trajectories
(2021)
Article
Open AccessThe automatic generation of road networks from GPS tracks is a challenging problem that has been receiving considerable attention in the last years. Although dozens of methods have been proposed, current techniques suffer ... -
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 ... -
Anomalous subduction initiation: young under old oceanic lithosphere
(2021-05-17)
Article
Open AccessWhen subduction initiates along a transform fault, it is often interpreted that the older and therefore denser oceanic lithosphere should evolve into the downgoing plate. However, in the western Pacific, several geological ... -
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 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 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 ...
