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Relevant bibliographies by topics / Radiopropagation

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Academic literature on the topic 'Radiopropagation'

Author: Grafiati

Published: 22 February 2023

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Journal articles on the topic "Radiopropagation"

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Biscarini, Marianna, Luca Milani, Mario Montopoli, et al. "Exploiting Tropospheric Measurements From Sun-Tracking Radiometer for Radiopropagation Models at Centimeter and Millimeter Wave." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 12, no. 6 (2019): 1697–708. http://dx.doi.org/10.1109/jstars.2019.2916372.

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Lopez-Iturri, Peio, Fran Casino, Erik Aguirre, Leyre Azpilicueta, Francisco Falcone, and Agusti Solanas. "Performance Analysis of ZigBee Wireless Networks for AAL through Hybrid Ray Launching and Collaborative Filtering." Journal of Sensors 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/2424101.

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This paper presents a novel hybrid simulation method based on the combination of an in-house developed 3D ray launching algorithm and a collaborative filtering (CF) technique, which will be used to analyze the performance of ZigBee-based wireless sensor networks (WSNs) to enable ambient assisted living (AAL). The combination of Low Definition results obtained by means of a deterministic ray launching method and the application of a CF technique leads to a drastic reduction of the time and computational cost required to obtain accurate simulation results. The paper also reports that this kind of AAL indoor complex scenario with multiple wireless devices needs a thorough and personalized radioplanning analysis as radiopropagation has a strong dependence on the network topology and the specific morphology of the scenario. The wireless channel analysis performed by our hybrid method provides valuable insight into network design phases of complex wireless systems, typical in AAL-oriented environments. Thus, it results in optimizing network deployment, reducing overall interference levels, and increasing the overall system performance in terms of cost reduction, transmission rates, and energy efficiency.

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Correia, Magaly De Fatima, Jônatas Costa Bezerra, Leonardo Fagner Ponciano Barbieri, Maria Regina da Silva Aragão, and Weber Andrade Gonçalves. "Mudanças no Uso do Solo e Variações no Padrão de Refratividade Atmosférica: Uma Análise Numérica e Observacional na Área do Polo de Irrigação Petrolina/Juazeiro (Changes in Soil Use and Atmospheric Refractivity Pattern Variations: A Numerical and ...)." Revista Brasileira de Geografia Física 6, no. 4 (2013): 919. http://dx.doi.org/10.26848/rbgf.v6i4.233085.

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Mudanças no padrão de refratividade atmosférica decorrentes de intervenções no regime hidrológico do rio São Francisco são avaliadas neste trabalho. Impactos de alterações nos processos de troca de água e energia entre a superfície e atmosfera são quantificados com base em séries históricas de dados coletados em estações convencionais de superfície situadas na região e em simulações numéricas em alta resolução realizadas com o modelo RAMS (Regional Atmospheric Modeling System). Os resultados mostram que empreendimentos do porte do reservatório de Sobradinho são responsáveis por mudanças significativas no padrão de refratividade regional, não apenas na área do reservatório mais, principalmente, no entorno da represa em função das alterações na cobertura e uso do solo resultantes da expansão agrícola e da substituição da vegetação caatinga por culturas irrigadas. Variações temporais no índice de refração atmosférica podem afetar a propagação do sinal em sistemas móveis.   A B S T R A C T Changes in the atmospheric refractivity patterns due to interventions in the hydrological regime of the São Francisco River are evaluated in this work. Impacts of alterations in the processes of water and energy exchange between the surface and the atmosphere are quantified with a basis on historical data series collected at conventional surface meteorological stations located in the region, and in RAMS (Regional Atmospheric Modeling System) high resolution numerical simulations. Results indicate that mega-projects as Sobradinho cause significant changes in the regional refractivity pattern, not only in the reservoir area, but mainly in the dam vicinity due to alterations in soil use and coverage that result when the caatinga vegetation is replaced by irrigated crops. Temporal variations in the atmospheric refractivity index may affect signal propagation in mobile systems. Keywords: refractivity, radiopropagation, RAMS, soil use, microclimate, caatinga, irrigation

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Fahr, Hans-Jörg, and Mark Siewert. "Local Spacetime Dynamics, the Einstein-Straus Vacuole and the PIONEER Anomaly: A New Access to these Problems." Zeitschrift für Naturforschung A 62, no. 3-4 (2007): 117–26. http://dx.doi.org/10.1515/zna-2007-3-402.

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The question concerning the extent of the local spacetime has often been raised. At what circumsolar distance the well known Robertson-Walker spacetime of our expanding universe may become a valid approximation? Inside of that distance a local Schwarzschild metric, which permits to explain the Keplerian motions of planets within the frame of general relativity, must be applicable.We briefly analyze the historical answer to that question given by Einstein, Straus and their followers and show that till now this answer is unsatisfactory in many respects.We revisit the problem of local spacetime geometries in the light of their effects on local photon propagation in view of the radiopropagation phenomena detected with the NASA spaceprobes PIONEER-10/11, waiting for a satisfying answer for several decades now. Comparing radiosignals outgoing from the earth to the probe and ingoing again from the probe to the receiver on earth do show anomalous frequency shifts which presently find no explanation by anomalous non-Newtonian decelerations of these probes. Therefore we study cosmological conditions for the transfer of radiosignals between the earth and these distant probes based on time dependent local spacetime geometries. First we study the cosmological redshift of radiophotons during their propagation to the spaceprobe and show that this shift in fact explains the registered PIONEER phenomenon under the assumption that the full cosmological expansion of the universe also takes place locally. Though yielding the right magnitude, one finds that this assumption leads to a redshift instead of the observed blueshift. We then, however, show that theoretically motivated forms of time dependent local spacetime metrices in fact lead to a blueshift of the needed magnitude. The appropriate local space vacuole is characterized by a Schwarzschild metric of a central mass increasing with cosmic time. Though it is clear that further studies of this effect have to be carried out to give more credit and verification to this hypothetical result, nevertheless more careful hightech radiotracking of freely flying spaceprobes may do a usefull job in confirming a completely unexpected, but cosmologically highly relevant phenomenon.

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E. Zuccheretti. "Interfacing and off-line analysis for VOS-1A Barry ionosonde." Annals of Geophysics 41, no. 4 (1998). http://dx.doi.org/10.4401/ag-3807.

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Ionospheric studies have a great importance in radiopropagation and planetary atmospheric physics. The basic instrument for the investigation of ionospheric physics is the sweep frequency H-F radar called ionosonde. Ionospheric measurements, like other geophysical quantities, are useful only if there is a long and unbroken history, both for scientific and service purposes. Therefore a huge amount of data is produced and only a few ionospheric characteristics are scaled. In the Istituto Nazionale di Geofisica, the ionospheric hard copy data bank (paper and film) already requires a large storage space. The rough data on hard copy are not suitable for complete analysis and they should be completely digitized before processing. Usually only some characteristics are digitized and stored (scaled ionogram), but in this way it becomes more difficult to extract important physical quantities like the electron density profile. In order to overcome these problems, an Ionospheric Data Acquisition System (IDAS) based on commercial PCs has been developed. This ensures reliability for data acquisition and the availability of commercial software packages for analysis, compression and storage.

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Dissertations / Theses on the topic "Radiopropagation"

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ALMEIDA, MARTA PUDWELL CHAVES DE. "RADIOPROPAGATION IN SATELLITE COMMUNICATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9622@1.

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O desenvolvimento de sistemas de comunicações via satélite requer a introdução de novas tecnologias e novas técnicas, e o uso de freqüências elevadas superiores a 10 GHZ. Para aplicações utilizando freqüências acima de 10 GHz, deve ser considerada predominantemente a atenuação causada pela chuva. Este trabalho apresenta resultados intermediários de uma campanha de medidas realizada no CETUC, na faixa de 12 GHz. Esta campanha foi iniciada em 1987 com a realização de medidas radiométricas em diferentes regiões climáticas do Brasil. Em 1995, foram adquiridos sistemas de recepção de sinais de beacon de satélite. O principal objetivo das medidas é a aquisição das distribuições estatísticas de longo termo da atenuação causadas pela chuva, a serem utilizadas no planejamento e dimensionamento de futuros sistemas de comunicações via satélite. Além das distribuições cumulativas de longo termo, são analisadas: a variabilidade das distribuições ano a ano, as estatísticas de pior mês, as características dinâmicas da atenuação por chuva, a dependência da ocorrência de atenuação com a hora do dia, a distribuição da taxa de precipitação e a previsão da atenuação a partir da taxa de precipitação.<br>The development of satellite communication systems requires the introduction of new technologies and techniques as well as the use of high frequencies, above 10GHz. Above such frequencies, rainfall induced attenuation effects, which are strongly frequency dependent, become important as the main source of reliability impairment. Thid work presents the intermediate results from a measurements campaign at 12GHz. This campaign began in CETUC in 1987 with radiometric measurements on several different Brazilian climatic regions. In 1995, systems for receiving satellite beacon signal were acquired. The main objective of the satellite beacon measurements is to obtain the long term distributions of rainfall induced attenuation, which will be used to aid the planning and design of future satellite communication systems. Besides the long term distributions of attenuation, the following results will be sought out: year-to-year variability of the attenuation distributions,worst-month statistics, the dynamic characteristics of rainfall induced attenuation, the daily variation of the occurrence of attenuation events, rainfall rate distributions and the possibility of modelling the attenuation as a function of the rainfall rate.

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RAMOS, GLAUCIO LOPES. "RADIOPROPAGATION MEASUREMENTS AT 3.5 GHZ ON URBAN ENVIRONMENTS: : PATH LOSS A VARIABILITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1792@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O transporte de voz continua crescendo nos sistemas de comunicações atuais, progredindo de um serviço específico numa determinada localização para um serviço mais pessoal, com a grande maioria das pessoas possuindo um telefone móvel. O transporte de dados é a área de maior desenvolvimento que, através da introdução do IP (acesso Internet), irá permitir diversas oportunidades de negócios. Transmissão de dados e outras aplicações serão a chave para novos rendimentos. Diversos serviços, principalmente para transporte IP, têm sido desenvolvidos, operando em freqüências mais altas que a de sistemas celulares atuais. Dentre elas existe uma aplicação específica da banda de 3,5 GHz para sistemas FWA (Fixed Wireless Access). Neste sentido, destaca-se a importância do estudo do comportamento de um sinal eletromagnético na freqüência de 3,5 GHz principalmente em ambientes urbanos. Este estudo foi desenvolvido neste trabalho e constituiu-se de uma campanha de medições de intensidade de campo nesta freqüência específica realizada em dois ambientes de características diferentes dentro da cidade do Rio de Janeiro. Um laboratório de medidas móveis foi montado e o nível de sinal recebido de uma transmissão fixa foi medido em diversas ruas destes ambientes. Resultados de perda de percurso em função da distancia foram obtidos e comparados com os modelos mais usuais de predição de cobertura. Além disto as características de variabilidade do nível de sinal recebido foram também medidas e suas estatísticas comparadas com distribuições de probabilidade conhecidas. Resultados obtidos no trabalho sugerem novos modelos de predição de perda de percurso e novas distribuições estatísticas principalmente para parâmetros sistêmicos como taxa de cruzamento de nível e duração média de desvanecimento.<br>Voice transport stills emerging in modern communication systems, going ahead from a specific located service to a more personal, with most of people having a mobile phone. Data transport is the development area that, through the Internet Protocol (IP), will allow a lot of opportunities on the business market. Data and the new applications that will emerge will be the key to new yields in wireless communications. A lot of data transport services through IP are being developed, operating on a frequency band higher than the one used by the existent cellular mobile systems. Actually there are a lot of emerging FWA (Fixed Wireless Access) services in the 3.5 GHz band with support to IP. Then, the study of the behaviour of an electromagnetic signal in 3.5 GHz is a very important issue because new and important applications are emerging and being developed in this band. In order to carry out this task, a fixed to mobile link was assembled and a lot of experimental work was performed on two different sites of Rio de Janeiro city. The results presented in this work deal with path- loss measurements for coverage prediction and the study of received signal variability essential on system parameter determination. The results are compared with the most popular empirical and statistical models in the literature. The conclusion of this work suggest that new prediction models for path-loss determination and new distribution functions are needed mainly for systems parameters like level crossing rate (LCR) and average fading duration (AFD).<br>EL transporte de voz continúa creciendo en los sistemas de comunicaciones actuales, llendo de un servicioo específico en una determinada localización para un servicio más personal, donde la gran mayoría de los individuos posean un teléfono móvil. El transporte de datos es el área en desarrollo que, a través de la introducción del IP (acceso Internet), abrirá diversas oportunidades de negocios. la transmisión de datos y otras aplicaciones serán un punto clave para nuevos rendimientos. Diversos servicios, principalmente para transporte IP, han sido desarrollados, operando en frecuencias más altas que la de sistemas celulares actuales. Dentro de ellas, existe una aplicación específica de la banda de 3,5 GHz para sistemas FWA (Fixed Wireles Acces). En este sentido, es de destacar, la importancia del estudio del comportamiento de una seña eletromagnética en frecuencia de 3,5 GHz principalmente en ambientes urbanos. Este estudio fue desarrollado en el marco de este trabajo y está constituido por una campaña de mediciones de intensidad de campo en esta frecuencia específica realizada en dos ambientes de características diferentes en la cidad del Rio de Janeiro. Se montó un laboratorio de medidas móviles y el nivel de la señal recibido de una transmisión fija fue medido en diversas calles de estos ambientes. Se obtuvieron resultados de pérdida de recorrido en función de la distancia. Éstos fueron comparados con los modelos más usuales de predicción de cobertura. Se midieron además, las características de variabilidad del nivel de la señal recibida y sus estadísticas se fueron comparadas con las distribuciones de probabilidad conocidas. Los resultados obtenidos en este trabajo sugieren nuevos modelos de predicción de pérdida de recorrido y nuevas distribuciones estadísticas principalmente para parámetros sistémicos como tasa de cruzamiento de nível y duración media de desvanecimiento.

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MILANI, LUCA. "Atmospheric remote sensing and radiopropagation: from numerical modeling to spaceborne and terrestrial applications." Doctoral thesis, 2020. http://hdl.handle.net/11573/1360153.

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The remote sensing of electromagnetic wave properties is probably the most viable and fascinating way to observe and study physical media, comprising our planet and its atmosphere, at the same time ensuring a proper continuity in the observations. Applications are manifold and the scientific community has been importantly studying and investing on new technologies, which would let us widen our knowledge of what surrounds us. This thesis aims at showing some novel techniques and corresponding applications in the field of the atmospheric remote sensing and radio-propagation, at both microwave and optical wavelengths. The novel Sun-tracking microwave radiometry technique is shown. The antenna noise temperature of a ground-based microwave radiometer is measured by alternately pointing toward-the-Sun and off-the-Sun while tracking it along its diurnal ecliptic. During clear sky the brightness temperature of the Sun disk emission at K and Ka frequency bands and in the under-explored millimeter-wave V and W bands can be estimated by adopting different techniques. Parametric prediction models for retrieving all-weather atmospheric extinction from ground-based microwave radiometers are tested and their accuracy evaluated. Moreover, a characterization of suspended clouds in terms of atmospheric path attenuation is presented, by exploiting a stochastic approach used to model the time evolution of the cloud contribution. A model chain for the prediction of the tropospheric channel for the downlink of interplanetary missions operating above Ku band is proposed. On top of a detailed description of the approach, the chapter presents the validation results and examples of the model-chain online operation. Online operation has already been tested within a feasibility study applied to the BepiColombo mission to Mercury operated by the European Space Agency (ESA) and by exploiting the Hayabusa-2 mission Ka-band data by the Japan Aerospace Exploration Agency (JAXA), thanks to the ESA cross-support service. A preliminary (and successful) validation of the model-chain has been carried out by comparing the simulated signal-to-noise ratio with the one received from Hayabusa-2. At the next ITU World Radiocommunication Conference 2019, Agenda Item 1.13 will address the identification and the possible additional allocation of radio-frequency spectrum to serve the future development of systems supporting the fifth generation of cellular mobile communications (5G). The potential impact of International Mobile Telecommunications (IMT) deployments is shown in terms of received radio frequency interference by ESA’s telecommunication links. Received interference can derive from several radio-propagation mechanisms, which strongly depend on atmospheric conditions, radio frequency, link availability, distance and path topography; at any time a single mechanism, or more than one may be present. Results are shown in terms of required separation distances, i.e. the minimum distance between the earth station and the IMT station ensuring that the protection criteria for the earth station are met.

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"Radiopropagation measurements at 3.5 ghz on urban environments: : path loss a variability." Tese, MAXWELL, 2001. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=1792:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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Books on the topic "Radiopropagation"

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Committee, Commission of the European Communities Project COST 205 Management. Influence of the atmosphere on radiopropagation on satellite earth paths at frequencies above 10 GHz. Commission of the European Communities Directorate-General Information Market and Innovation, 1985.

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2

O, Ajayi G., and URSI Standing Committee on Developing Countries., eds. Handbook on radiopropagation related to satellite communications in tropical and subtropical countries. International Centre for Theoretical Physics, 1996.

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Conference papers on the topic "Radiopropagation"

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John Heyller Amaya Valencia and Javier Enrique Arevalo Pena. "MIMO multiantenna systems radiopropagation aspects." In 2014 IEEE Colombian Conference on Communications and Computing (COLCOM). IEEE, 2014. http://dx.doi.org/10.1109/colcomcon.2014.6860417.

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da Silva, Felipe A. A., Marcelo B. Perotoni, and Kenedy M. G. dos Santos. "SDR-based Radiopropagation Measurement System." In 2021 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC). IEEE, 2021. http://dx.doi.org/10.1109/imoc53012.2021.9624889.

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Baghdadi, Hisham, Erik Aguirre, Peio Lopez, et al. "Analysis of radiopropagation of wireless transceivers in surfboards." In 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2014. http://dx.doi.org/10.1109/usnc-ursi.2014.6955501.

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Torres, R. P., L. Valle, M. Domingo, and S. Loredo. "An efficient ray-tracing method for radiopropagation based on the modified BSP algorithm." In Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324). IEEE, 1999. http://dx.doi.org/10.1109/vetecf.1999.797281.

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Angelucci, M., B. Di Chiara, M. Montepeloso, R. Sorrentino, M. Strappini, and L. Tarricone. "Conventional radiopropagation models and no-wave equation approaches: an application of the percolation theory." In 33rd European Microwave Conference, 2003. IEEE, 2003. http://dx.doi.org/10.1109/euma.2003.341146.

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Angelucci, M., B. D. Chiara, M. Montepeloso, R. Sorrentino, M. Strappini, and L. Tarricone. "Conventional radiopropagation models and no-wave equation approaches: an application of the percolation theory." In 33rd European Microwave Conference Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/eumc.2003.177691.

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Biscarini, M., L. Luini, C. Riva, et al. "Short-term Forecast of Radiocommunication Geostationary Satellite Links coupling Weather Prediction and Radiopropagation Models." In 2022 16th European Conference on Antennas and Propagation (EuCAP). IEEE, 2022. http://dx.doi.org/10.23919/eucap53622.2022.9769013.

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Pena, Javier Enrique Arevalo, and Ricardo Alirio Gonzalez Bustamante. "Radiopropagation Simulations in 28 GHz, 38 GHz and 60 GHz with 128 Elements Massive MIMO Array for 5G Networks." In 2018 IEEE MTT-S Latin America Microwave Conference (LAMC). IEEE, 2018. http://dx.doi.org/10.1109/lamc.2018.8699011.

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Pena, Javier Enrique Arevalo. "Simulation of radiopropagation coverage in a fixed reception network of DVB-T2 digital terrestrial television: Metropolitan scenario of Bogotá D. C. (Colombia)." In 2017 Congreso Internacional de Innovacion y Tendencias en Ingenieria (CONIITI) [2017 International Congress of Innovation and Trends in Engineering (CONIITI)]. IEEE, 2017. http://dx.doi.org/10.1109/coniiti.2017.8273349.

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