Radars
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. C-Band Monopulse Planar Array and Feeding Network
Abstract Monopulse radars operate with simultaneous beams and are used for tracking purposes, relying only on hardware to provide a real-time indication of the target position. A monopulse array and its feeding network is implemented and tested, in the frequency of 5.4 GHz, based on patch antennas using dieletric to provide wide bandwidth and high gain. The
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Horizontal and vertical positional accuracy assement of cartographic products of the amazon region derived from interferometric sar data in X and P bands from ORBISAR sensor / Avaliação da acurácia posicional planialtimétrica de produtos cartográficos da Região Amazônica extraídos de dados SAR interferométricos nas bandas X e P do sensor ORBISAR
The Geographic Service of the Brazilian Army (DSG) is running a major mapping project in Brazil, called ´´Radiography Amazon", the region known as ´´Empty Mapping the Amazon." This area, approximately 1,8 million km$^2$, has not had, to date, appropriate land information mapping at scales larger than 1:250,000, except insufficient cartographic documents
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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3. Editorial
the aim of this work is to present a new methodology, based on vector and geometrical techniques, for determining the position of an intruder in a residence (3D problem). Initially, modifications in the electromagnetic responses of the environment, caused by movements of the trespasser, are detected. It is worth mentioning that slight movements are detected
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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4. Numerical evaluation of an air-to-air missile radar cross section signature at X-band
Abstract: The remote detection of a vehicle requires that some kinds of its emissions are tracked and detected. Usually, electromagnetic emissions are used in the form of radar (electromagnetic waves in the range of radiofrequency and microwaves). Different types of antennas are used as sensors, tailored to the signal frequency band and its polarization, as
J. Aerosp. Technol. Manag.. Publicado em: 2011-12
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5. Development of software for studies of precipitation using radars and satellite / Desenvolvimento de software para estudos de precipitação usando radares e satélites
The joint analysis of meteorological satellite and radar images is performed in order to correlate the precipitation structures observed in both images. The study of such correlation allows the extension of the radar range. This task is currently performed by hand, in a non systematical way, making use of several computer programs. This work presents the Rad
Publicado em: 2010
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6. Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region / Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/02/2009
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7. Assessment of polarimetric ALOS PALSAR data for Amazon land cover classification / Avaliação de dados polarimétricos do sensor ALOS PALSAR para classificação da cobertura da terra da Amazônia
Amazon Forest is considered the largest tropical forest of the planet. It keeps considerable part of the biodiversity and has great importance to the biogeochemistry cycles. The anthropic actions cause destructive processes such as deforestations and burnings, which can provoke unbalances on the ecosystem. This scenario highlights the importance of the monit
Publicado em: 2009
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8. Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial / Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
Publicado em: 2009
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9. Comportamento de líquidos no espaço-sloshing e amortecedores de nutação viscosos / Fluid behavior in the space-sloshing and viscous nutation dampers
The attitude dynamics refers to the space vehicle motion around its center of mass while orbiting the Earth. The knowledge of the attitude motion is fundamental for the accomplishment of the space mission objectives. The use of appropriate sensors and actuators, onboard computers, GPS and radars and ground stations are among technologies allowing the attitud
Publicado em: 2009
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10. Study of winds from 80 to 100km by meteorradar at Santa Maria (29,7°S;53,8°O) Region / Estudo dos ventos entre 80 e 100 km utilizando radar meteórico na região de Santa Maria (29,7°S; 53,8°O)
The present work deals with prevailing winds and atmospheric solar tides from 80 to 100 km, measured by SKiYMET meteor radar at Santa Maria (29,7°S; 53,8°W). This is the first detailed study using the Santa Maria SKiYMET data. The data period used for this analysis is the three years of observation 2005 to 2007. Monthly and annual analyses are made to inve
Publicado em: 2008
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11. Avaliação altimétrica dos dados SRTM para a região amazônica / Altimetric evaluation of SRTM data for the Amazon region
In large areas of forest cover, such as the Amazon region, there is an absence of detailed topographical charts. It can be explained by the lack of reliable data at a reasonable cost. The Digital Elevation Model (DEM) obtained by the Shuttle Radar Topographic Mission (SRTM) can be considered as the best topographical information available for a large part of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/12/2007
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12. Avaliação dos dados produzidos pela rede de radares meteorológicos de banda "S" localizados no centro sul do Brasil / Evaluation of the data produced by the s band weather radars network located in central southern Brazil
Os dados de radares meteorológicos localizados na porção central, sudeste e sul do Brasil vêm sendo usados de forma sistemática pelo Centro de Previsão de Tempo e Estudos Climáticos (CPTEC/INPE) e Departamento de Controle do Espaço Aéreo (DECEA), após a implantação do Convênio de Cooperação Técnico - Cientifico assinado por essas instituiçõ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/08/2007