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Rozprawy doktorskie na temat „Ionospheric modeling”

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Data publikacji: 6 września 2023

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1

Arora, Balwinder Singh Amrit Singh. "Ionospheric modeling for low frequency radioastronomy." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/56529.

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The research presented in this thesis aims to develop ionospheric corrections for calibration of future low frequency radio interferometers. GNSS data from ground stations close to the MRO were used to produce a model of the ionosphere. Comparisons of this model with ionospheric parameters derived from the MWA observations show good agreement. The installation of new GNSS stations in the vicinity of MRO would allow ionospheric modelling with higher spatial resolution.

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Moraes, Alison de Oliveira. "Advances in statistical modeling of ionospheric scintillation." Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2240.

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Ionospheric scintillation is a phenomenon that occurs daily, especially around the equatorial region, during the summer solstice after the sunset, affecting radio signals that propagate through the ionosphere. Depending on the temporal and spatial situation, ionospheric scintillation can represent a problem in the availability and precision of the Global Navigation Satellite Systems (GNSS). This work is concerned with the statistical modeling and evaluation of the impact of amplitude scintillation on the performance of Global Positioning System (GPS) receivers. In this work the use of ?-? mo

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Ismail, Atikah. "Fourier spectral methods for numerical modeling of ionospheric processes." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-03142009-040454/.

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Brosie, Kayla Nicole. "Ionospheric Scintillation Prediction, Modeling, and Observation Techniques for the August 2017 Solar Eclipse." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78710.

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A full solar eclipse is going to be visible from a range of states in the contiguous United States on August 21, 2017. Since the atmosphere of the Earth is charged by the sun, the blocking of the sunlight by the moon may cause short term changes to the atmosphere, such as density and temperature alterations. There are many ways to measure these changes, one of these being ionospheric scintillation. Ionospheric scintillation is rapid amplitude and phase fluctuations of signals passing through the ionosphere caused by electron density irregularities in the ionosphere. At mid-latitudes, scintilla

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Deshpande, Kshitija Bharat. "Investigation of High Latitude Ionospheric Irregularities utilizing Modeling and GPS Observations." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/49507.

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Complex magnetosphere-ionosphere coupling mechanisms result in high latitude irregularities that are difficult to characterize. Until recently, the polar and auroral irregularities remained largely unexplored. Inadequate infrastructures to deploy and maintain advanced dual frequency Global Navigation Satellite System (GNSS) receivers at high latitudes, especially in the Southern hemisphere, makes such an investigation a formidable task. Additionally, the complicated geometry of the magnetic field lines in these regions pose challenges in designing global scintillation models. This dissertation

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6

Lyu, Haixia. "Contributions to ionospheric modeling with GNSS in mapping function, tomography and polar electron." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/670334.

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This dissertation focuses on determining the vertical electron content distribution in low and high vertical resolution from ground-based and LEO on board GNSS data and improving the knowledge of ionosphere climatology in northern mid-latitude and polar regions. The novelty is summarized in the following four aspects: The first contribution is to propose a new ionospheric mapping function concept - Barcelona Ionospheric Mapping Function (BIMF), in order to improve STEC (Slant Total Electron Content) conversion accuracy from any given VTEC (Vertical Total Electron Content) model. BIMF is base

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7

Aghakarimi, Armin. "Local Modeling Of The Ionospheric Vertical Total Electron Content (vtec) Using Particle Filter." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614867/index.pdf.

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ABSTRACT LOCAL MODELING OF THE IONOSPHERIC VERTICAL TOTAL ELECTRON CONTENT (VTEC) USING PARTICLE FILTER Aghakarimi, Armin M.Sc., Department of Geodetic and Geographic Information Technologies Supervisor: Prof. Dr. Mahmut Onur Karslioglu September 2012, 98 pages Ionosphere modeling is an important field of current studies because of its influences on the propagation of the electromagnetic signals. Among the various methods of obtaining ionospheric information, Global Positioning System (GPS) is the most prominent one because of extensive stations distributed all over the world. There are

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8

Kindervatter, Tim. "Survey of Ionospheric Propagation Effects and Modeling Techniques for Mitigation of GPS Error." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1515106508878179.

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9

Pinkepank, James Alan. "The applicability of neural networks to ionospheric modeling in support of relocatable over-the-horizon radar." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA286114.

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10

Eltrass, Ahmed Said Hassan Ahmed. "The Mid-Latitude Ionosphere: Modeling and Analysis of Plasma Wave Irregularities and the Potential Impact on GPS Signals." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51804.

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The mid-latitude ionosphere is more complicated than previously thought, as it includes many different scales of wave-like structures. Recent studies reveal that the mid-latitude ionospheric irregularities are less understood due to lack of models and observations that can explain the characteristics of the observed wave structures. Since temperature and density gradients are a persistent feature in the mid-latitude ionosphere near the plasmapause, the drift mode growth rate at short wavelengths may explain the mid-latitude decameter-scale ionospheric irregularities observed by the Super Dual

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11

Perna, Luigi <1985&gt. "Ionospheric Plasma Response to the Anomalous Minimum of the Solar Cycle 23/24: Modeling and Comparison with IRI-2012." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/7861/1/Perna_Luigi_tesi.pdf.

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The work inspects the ionospheric plasma response to the last minimum of solar activity (minimum 23/24, years 2008-2009), which was extremely low and prolonged. Characterized by unprecedented features in space era, the last minimum represents then a unique natural window to study the ionospheric plasma behaviors in such extreme conditions. The work is organized in two main parts. The first one focuses on the analysis of the relationships between the parameter foF2 and five widely used solar activity indices: F10.7, Lym-α, MgII, R and EUV0.1-50. Using the long and continuous dataset of the mid-

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12

Chakraborty, Shibaji. "Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103706.

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The ionosphere is the conducting part of the upper atmosphere that plays a significant role in trans-ionospheric high frequency (HF, 3-30 MHz) radiowave propagation. Solar activities, such as solar flares, radiation storms, coronal mass ejections (CMEs), alter the state of the ionosphere, a phenomenon known as Sudden Ionospheric Disturbance (SID), that can severely disrupt HF radio communication links by enhancing radiowave absorption and altering signal frequency and phase. The Super Dual Auroral Radar Network (SuperDARN) is an international network of low-power HF coherent scatter radars dis

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13

Fu, Haiyang. "Modeling of Plasma Irregularities Associated with Artificially Created Dusty Plasmas in the Near-Earth Space Environment." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19248.

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Plasma turbulence associated with the creation of an artificial dust layer in the earth's ionosphere is investigated. The Charged Aerosol Release Experiment (CARE) aims to understand the mechanisms for enhanced radar scatter from plasma irregularities embedded in dusty plasmas in space. Plasma irregularities embedded in a artificial dusty plasma in space may shed light on understanding the mechanism for enhanced radar scatter in Noctilucent Clouds (NLCs) and Polar Mesospheric Summer Echoes (PMSEs) in the earth's mesosphere. Artificially created, charged-particulate layers also have strong impa

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14

Da, Dalt Federico. "Ionospheric modelling and data assimilation." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665450.

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A New Ionospheric Model (ANIMo) based upon the physics of production, loss, and vertical transport has been developed. The model is driven by estimates of neutral composition, temperature and solar flux and is applicable to the mid-latitude regions of the Earth under quiet and moderate geomagnetic conditions. This model was designed to exhibit specific features that were not easy to find all together in other existing ionospheric models. ANIMo needed to be simple to use and interact with, relatively accurate, reliable, robust and computationally efficient. The definition of these characteristi

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15

Sibanda, Patrick. "Challenges in topside ionospheric modelling over South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005238.

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This thesis creates a basic framework and provides the information necessary to create a more accurate description of the topside ionosphere in terms of the altitude variation of the electron density (Ne) over the South African region. The detailed overview of various topside ionospheric modelling techniques, with specific emphasis on their implications for the efforts to model the South African topside, provides a starting point towards achieving the goals. The novelty of the thesis lies in the investigation of the applicabilityof three different techniques to model the South African topside

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16

Edwards, Thomas Raymond. "Empirical Ionospheric Models: The Road To Conductivity." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100284.

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The Earth's polar ionosphere is a highly dynamic region of the upper atmosphere, and acts as the closure of the greater magnetospheric current system. This region plays host to many electrodynamic effects that impact terrestrial systems, such as power grids, railroads, and pipelines. These effects are fundamentally related to the currents, electric fields, and conductivity present in the polar ionosphere. Understanding and predicting the electrodynamics of this region is vital to being able to determine the physical impacts on terrestrial systems and provide predictions to government and comme

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17

Akel, Junior Alberto Fares. "Modelagem de propagação subionosférica de ondas de frequência muito baixa." Universidade Presbiteriana Mackenzie, 2015. http://tede.mackenzie.br/jspui/handle/tede/1529.

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Made available in DSpace on 2016-03-15T19:38:53Z (GMT). No. of bitstreams: 1 ALBERTO FARES AKEL JUNIOR.pdf: 5112998 bytes, checksum: f18fc33d2f9508c3ec265c0efa016b43 (MD5) Previous issue date: 2015-08-21<br>Fundação de Amparo a Pesquisa do Estado de São Paulo<br>We study the behavior of the Earth-ionosphere waveguide through the modeling of the propagation of very low frequency radio waves (VLF). We use the computational model LWPC (Long Wave Propagation Capability) to estimate changes in amplitude and phase of the VLF signals detected by the SAVNET network (South America VLF NETwork), and t

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18

Bryers, Carl. "Quantitative modelling of ionospheric modification experiments at EISCAT." Thesis, Lancaster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675678.

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19

Blanch, Llosa Estefania. "Comportamiento característico de la estructura vertical de la ionosfera en condiciones de calma y perturbadas." Doctoral thesis, Universitat Ramon Llull, 2009. http://hdl.handle.net/10803/9320.

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Aquesta investigació s'ha centrat en profunditzar en el coneixement del comportament de l'estructura vertical de la regió F de la ionosfera, tant en condicions de calma com pertorbades, i en la seva modelització mitjançant funcions analítiques. Les pretensions d'aquesta investigació han estat motivades per les discrepàncies existents entre les prediccions ionosfèriques del gruix i la forma del perfil de densitat de la regió F en condicions de calma i la seva variació característica, i per l'absència d'un model capaç de reproduir la resposta de l'altura del màxim de ionització en condiciones pe

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20

Petrie, Elizabeth Jane. "Modelling higher-order ionospheric effects on global GPS solutions." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612620.

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Higher order ionospheric effects have grown in relevance as the accuracy of geodetic GPS analysis has increased in recent years and have become an active area of research. Considering periods of up to three years at ionospheric maximum, previous studies modelled the effects of the second (12) and third (B) order ionospheric terms arising from the expansion ofthe refractive index of the ionosphere as a series. This study investigates the effects of the 12 and 13 terms and also those of the higher order ionospheric bending terms over a much longer period of 14 years. This allows more extensive c

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21

Dubazane, Makhosonke Berthwell. "Modelling Ionospheric vertical drifts over the African low latitude region." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63356.

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Low/equatorial latitudes vertical plasma drifts and electric fields govern the formation and changes of ionospheric density structures which affect space-based systems such as communications, navigation and positioning. Dynamical and electrodynamical processes play important roles in plasma distribution at different altitudes. Because of the high variability of E × B drift in low latitude regions, coupled with various processes that sometimes originate from high latitudes especially during geomagnetic storm conditions, it is challenging to develop accurate vertical drift models. This is despit

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22

Abdullah, Mardina. "Modelling and determination of ionospheric effects on relative GPS measurements." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410711.

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23

Weigel, Robert Scott. "Prediction and modeling of magnetospheric substorms /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004399.

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Wohlwend, Christian Stephen. "Modeling the Electrodynamics of the Low-Latitude Ionosphere." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/11.

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The electrodynamics of the Earth's low-latitude ionosphere is dependent on the ionospheric conductivity and the thermospheric neutral density, temperature, and winds present. This two-part study focused on the gravity wave seeding mechanism of equatorial plasma depletions in the ionosphere and the associated equatorial spread F, as well as the differences between a two-dimensional flux tube integrated electrodynamics model and a three-dimensional model for the same time period. The gravity wave seeding study was based on a parameterization of a gravity wave perturbation using a background empi

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25

Kero, A. (Antti). "Ionospheric D-region studies by means of active heating experiments and modelling." Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514289163.

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Abstract Powerful radio waves can heat an electron gas via collisions between free electrons and neutral particles. Since the discovery of the Luxembourg effect in 1934, this effect is known to take place in the D-region ionosphere. According to theoretical models, the EISCAT Heating facility is capable of increasing the electron temperature by a factor of 5–10 in the D region, depending mostly on the electron density profile. Various indirect evidence for the existence of the D-region heating effect has been available, including successful modification of ionospheric conductivities and mesosp

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26

Uwamahoro, Jean Claude. "Single station TEC modelling during storm conditions." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020325.

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It has been shown in ionospheric research that modelling total electron content (TEC) during storm conditions is a big challenge. In this study, mathematical equations were developed to estimate TEC over Sutherland (32.38⁰S, 20.81⁰E), during storm conditions, using the Empirical Orthogonal Function (EOF) analysis, combined with regression analysis. TEC was derived from GPS observations and a geomagnetic storm was defined for Dst ≤ -50 nT. The inputs for the model were chosen based on the factors that influence TEC variation, such as diurnal, seasonal, solar and geomagnetic activity variation,

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Nohutcu, Metin. "Development Of A Matlab Based Software Package For Ionosphere Modeling." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611229/index.pdf.

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Modeling of the ionosphere has been a highly interesting subject within the scientific community due to its effects on the propagation of electromagnetic waves. The development of the Global Positioning System (GPS) and creation of extensive ground-based GPS networks started a new period in observation of the ionosphere, which resulted in several studies on GPS-based modeling of the ionosphere. However, software studies on the subject that are open to the scientific community have not progressed in a similar manner and the options for the research community to reach ionospheric modeling result

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Skone, Susan. "Wide area ionosphere grid modelling in the auroral region." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0030/NQ38507.pdf.

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Ennis, Alison Elisabeth. "Mathematcal modelling of vibrationally excited nitrogen in the ionosphere." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389732.

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Grandin, M. (Maxime). "Multi-instrument and modelling studies of the ionospheres at Earth and Mars." Doctoral thesis, University of Oulu, 2018. http://urn.fi/urn:isbn:9789526216157.

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Abstract This thesis studies the ionospheres of the Earth and Mars by combining the observations of versatile instruments providing information on various aspects of the planetary environments. The work on the terrestrial ionosphere focuses particularly on solar wind–magnetosphere–ionosphere coupling, while the work on the Martian ionosphere is based on the development of a new approach to analyse radio-occultation data to retrieve the atmospheric and ionospheric profiles. In the Earth's ionosphere, two papers study the effects of solar wind high-speed streams on the ionospheric F-region peak

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31

Hong, Chang-Ki. "Efficient differential code bias and ionosphere modeling and their impact on the network-based GPS positioning." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1190083730.

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32

Wyllie, Scott John, and scott wyllie@rmit edu au. "Modelling the Temporal Variation of the Ionosphere in a Network-RTK Environment." RMIT University. Mathematical and Geospatial Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080617.161323.

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The Global Positioning System (GPS) has been widely used for precise positioning applications throughout the world. However, there are still some limiting factors that affect the performance of satellite-based positioning techniques, including the ionosphere. The GPS Network-RTK (NRTK) concept has been developed in an attempt to remove the ionospheric bias from user observations within the network. This technique involves the establishment of a series of GNSS reference stations, spread over a wide geographical region. Real time data from each reference station is collected and transferred to a

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33

Shao, Yixie. "World-wide analysis and modelling of the ionospheric and plasmaspheric electron contents by means of radio occultations." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/665985.

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The research of this dissertation is studying the ionosphere by GPS radio occultation (RO) techniques. It is mainly divided into two parts. The first part focuses on the methodology in electron density profile retrievals from RO measurements. It aims to get more precise profiles from measured data. Classic Abel inversion is a methodology widely used in RO retrievals, and the error introduced by the spherical symmetry assumption is also well recognised. Separability Method (SM) was developed to eliminate this error in previous studies. In this work, the improvement brought by SM corresponding

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34

Hartkorn, Oliver [Verfasser], Joachim [Gutachter] Saur, and Bülent [Gutachter] Tezkan. "Modeling Callisto's Ionosphere, Airglow and Magnetic Field Environment / Oliver Hartkorn ; Gutachter: Joachim Saur, Bülent Tezkan." Köln : Universitäts- und Stadtbibliothek Köln, 2017. http://d-nb.info/1138359459/34.

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35

Qahwash, Murad M. "High frequency communication system modeling and performance enhancement, employing novel adaptive DSP techniques." Doctoral diss., University of Central Florida, 2002. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/1383.

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University of Central Florida College of Engineering Thesis<br>High Frequency (HF) communication has been shown to be a useful communication technique from the very beginning of World War I and it accelerated during World War 11. This is attributed to its simplicity, ability to provide near globe connectivity at low power without repeaters, moderate cost, and ease of proliferation [I]. In fact, the HF communication system utilizes the ionosphere [2][3][4] to refract the skywave signals to a distant receiver. This ionospheric channel has some disadvantages. First, it is a non-stationary channel

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Mannix, Christopher Robert. "Measuring and modelling the impact of the ionosphere on space based synthetic aperture radars." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6869/.

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Synthetic aperture radar (SAR) is a technique widely used in applications that require all-weather imaging. The ionosphere affects the operation of these radars, with those operating at L-band (1-2 GHz) and below at risk of being seriously compromised by the ionosphere. A method of using Global Positioning System (GPS) data to synthesize the impact of the ionosphere on SAR systems has been presented. The technique was used to assess the viability of using a signal phase correction derived from a reference location in a SAR image to correct ionospheric effects across the image. A dataset of SAR

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Chiaretta, Marco. "Numerical modelling of Langmuir probe measurements for the Swarm spacecraft." Thesis, Uppsala universitet, Rymd- och plasmafysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-148633.

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This work studies the current collected by the spherical Langmuir probes to be mounted on the ESA Swarm satellites in order to quantify deviations from idealized cases caused by non-ideal probe geometry. The ﬁnite-element particle-in-cell code SPIS is used to model the current collection of a realistic probe, including the support structures, for two ionospheric plasma conditions with and without drift velocity. SPIS simulations are veriﬁed by comparing simulations of an ideal sphere at rest to previous numerical results by Laframboise parametrized to sufﬁcient accuracy. It is found that for p

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Zou, Li. "A modelling study of HF radar coherent detection of irregularities in the high-latitude ionosphere." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30604.

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Ground-based coherent backscatter radar systems are extensively used to investigate small-scale dynamics in the earth's ionosphere and related geophysical process(es) in the magnetosphere. At high-latitudes, HF radars are used due to the requisite orthogonal condition with the earth's magnetic field lines. Because of the effect of ionospheric refraction on the ray paths, the exact path of the radar signal through the ionosphere is then unknown. In practice, it is important to locate the radar echo sources given the echo parameters, such as group path, elevation angle, and azimuth angle. Furthe

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Chen, Chin-Hung. "Modeling and Observational Studies of Plasma Density Anomalies and Earthquake-triggered Disturbances in the Mid-latitude Ionosphere." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157786.

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Habarulema, John Bosco. "A contribution to TEC modelling over Southern Africa using GPS data." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005241.

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Modelling ionospheric total electron content (TEC) is an important area of interest for radio wave propagation, geodesy, surveying, the understanding of space weather dynamics and error correction in relation to Global Navigation Satellite Systems (GNNS) applications. With the utilisation of improved ionosonde technology coupled with the use of GNSS, the response of technological systems due to changes in the ionosphere during both quiet and disturbed conditions can be historically inferred. TEC values are usually derived from GNSS measurements using mathematically intensive algorithms. Howeve

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41

Limberger, Marco [Verfasser], Urs [Akademischer Betreuer] Hugentobler, Michael [Akademischer Betreuer] Schmidt, and Claudio [Akademischer Betreuer] Brunini. "Ionosphere modeling from GPS radio occultations and complementary data based on B-splines / Marco Limberger. Betreuer: Urs Hugentobler. Gutachter: Urs Hugentobler ; Michael Schmidt ; Claudio Brunini." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1077867409/34.

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42

Yapici, Tolga. "Influences Of Interplanetary Magnetic Field On The Variability Of Aerospace Media." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608784/index.pdf.

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The Interplanetary Magnetic Field (IMF) has a controlling effect on the Magnetosphere and Ionosphere. The objective in this work is to investigate the probable effects of IMF on Ionospheric and Geomagnetic response. To fulfill the objective the concept of an event has been created based on the polarity reversals and rate of change of the interplanetary magnetic field components, Bz and By. Superposed Epoch Method (SPE) was employed with the three event definitions, which are based on IMF Bz southward turnings ranging from 6 to 11 nT in order to quantify the effects of IMF By and Bz. For the fi

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Vanderburgh, Richard N. "One-Dimensional Kinetic Particle-In-Cell Simulations of Various Plasma Distributions." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1610313011646245.

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Gurel, Ilker. "Channel Estimation For Ofdm Systems." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606940/index.pdf.

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In this thesis, various pilot symbol aided channel estimation and tracking methods are investigated and their performances are compared for an OFDM system with packet based communication on HF channel. For the HF channel, Watterson HF channel model is used. The compared methods are least squares (LS) channel estimation, linear minimum mean square error (LMMSE) channel estimation, least mean squares (LMS) channel tracking, recursive least squares (RLS) channel tracking, constant position model based Kalman filter channel tracking, and constant velocity model based Kalman filter channel tracking

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Foucault, Etienne. "IONO-HF : propagation des ondes hautes fréquences dans l'ionosphère." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30039.

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L'étude de la propagation des ondes électromagnétiques en bandes hautes (HF) et très hautes fréquences (VHF) dans l'ionosphère gagne en intérêt avec l'essor des technologies de communication et de positionnement par satellites. Cependant, la transmission des signaux associés est dépendante du milieu qu'ils traversent : l'ionosphère. Cette partie de l'atmosphère terrestre (entre 60 et 2,000 km d'altitude) est composée d'un plasma partiellement ionisé, formé par la photo-dissociation des composants neutres par le rayonnement solaire X et UV et impacte la propagation des ondes radios du fait de s

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Oliveira, Junior Paulo Sergio de. "Definition and implementation of a new service for precise GNSS positioning." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152111.

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Submitted by Paulo Sérgio de Oliveira Júnior null (psergio.jr@hotmail.com) on 2017-11-17T14:41:41Z No. of bitstreams: 1 d_oliveira-jr_ps_thesis.pdf: 14260833 bytes, checksum: ebcb000a304456bb9bc42d8d1ccaa566 (MD5)<br>Approved for entry into archive by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br) on 2017-11-17T17:10:17Z (GMT) No. of bitstreams: 1 oliveirajunior_ps_dr_prud.pdf: 14260833 bytes, checksum: ebcb000a304456bb9bc42d8d1ccaa566 (MD5)<br>Made available in DSpace on 2017-11-17T17:10:17Z (GMT). No. of bitstreams: 1 oliveirajunior_ps_dr_prud.pdf: 14260833 bytes, checksum: ebcb

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"Ionospheric Channel Modeling and Estimation." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.46347.

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abstract: The goal is to provide accurate measurement of the channel between a ground source and a receiving satellite. The effects of the the ionosphere for ground to space propagation for radio waves in the 3-30 MHz HF band is an unstudied subject. The effects of the ionosphere on radio propagation is a long studied subject, the primary focus has been ground to ground by means of ionospheric reflection and space to ground corrections of ionospheric distortions of GPS. Because of the plasma properties of the ionosphere there is a strong dependence on the frequency of use. GPS L1 1575.42 M

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"Three-dimensional, high resolution, computerized ionospheric tomographic imaging and computational modeling of an artificial ionospheric cavity." WEST VIRGINIA UNIVERSITY, 2008. http://pqdtopen.proquest.com/#viewpdf?dispub=3300883.

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Chen, Yao-Chung, and 陳耀鐘. "A Novel Method For Regional Ionospheric VTEC Modeling and Computerized Ionospheric Tomography Using GPS Measurements: LS-MARS." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/93496958406955331650.

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博士<br>國立中興大學<br>土木工程學系所<br>102<br>At present, all proposed method for ionospheric vertical total electron content (VTEC) and electron density (ED) modeling using GNSS could be classified into two different categories: function-based and pixel-based. The key point of function-based method is to select an appropriate mathematical function for the distribution of ionospheric VTEC or ionospheric ED over modeling region thus effectively estimates the differential code bias of the receiver (RDCB), the differential code bias of the satellite (SDCB), VTEC or ED. However, the ionosphere not only varies

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Tzeng, Duen-Bin, and 曾惇彬. "Modeling Ionospheric Effects with Multiple Reference Stations for GPS Satellite Surveying." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/69479068407984456206.

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碩士<br>國立中央大學<br>土木工程研究所<br>89<br>Satellite surveying with the Global Positioning System (GPS) has shown several advantages over standard surveying techniques. However, because of some unmodeled systematic errors, the possibility of successful ambiguity resolution is poor in the processing of long baseline vectors. Therefore, the methods of modeling ionospheric errors and increasing measurement equations are proposed with multiple reference stations. There are two proposed method of estimating ionospheric delays; one is linear interpolation according to the positions of reference and rover stat

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