Weather Radar
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Evaluation of the data produced by the s band weather radars network located in central southern Brazil / Avaliação dos dados produzidos pela rede de radares meteorológicos de banda "S" localizados no centro sul do Brasil
Data from the weather radars located in central, southeastern and southern Brazil has been used by the CPTEC and DECEA since the agreement between both institutions was signed in 2004. Before this date the radar data was used by flight protection purposes only, and was not stored. Nowadays, the radar products derived from the scanning strategy of all radars
Publicado em: 2007
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14. 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
Publicado em: 2007
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15. Projeto e implementação do controle de posição de uma antena de radar meteorológico através de servomecanismos. / Design and implementation of a weather-radar antenna position control using servomechanisms.
A classical radar antenna is basically composed of a primary source mounted at the focal point of a parabolic reflector. The illumination rule is established so that the desired beam-shape is attained, as precisely as possible. The physical motion of the set guarantees the coverage of the desired volume of exploitation. The actual text studies the design and
Publicado em: 2006
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16. Rainfall estimation in tropical regions using GOES-12 satellite imagery / Estimativa de precipitação em regiões tropicais utilizando imagens do satelite GOES 12
Das variáveis que compõem o balanço hídrico, a precipitação é, certamente, o fator natural determinante da produção agrícola no país. A deficiência hídrica afeta praticamente todos os aspectos relacionados ao desenvolvimento e produtividade das culturas agrícolas. Por outro lado, o excesso de precipitação também pode influenciar negativament
Publicado em: 2006
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17. Design, development and implementation of a solid-state pulse modulator for high-power pulse transmitters / Projeto, desenvolvimento e construção de um modulador de pulso estado-solido para transmissores pulsados de alta potencia
This work describes the development of a modular line-type solid-state pulse modulator topology to be applied in magnetron pulsed power radar transmitters, commonly found on tracking, weather and air traffic management radars. This research includes the design, development and assembling of a pulsed modulator for the Barreira do Inferno Launching Center (CLB
Publicado em: 2005
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18. Classificação textural de imagens radarsat-1 para discriminação de alvos agrícolas. / Agricultural targets discrimination by textural classification of radarsat-1 imagery.
Remote sensing images from the visible and infrared regions of the electromagnetic spectrum have demonstrated a great potential to identify and discriminate agricultural areas for crops estimation. However, cloud cover is an obstruction for this type of image acquisition. On the other hand, Synthetic Aperture Radar (SAR) images acquired in the microwave regi
Publicado em: 2004
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19. Implementação de uma rede neural artificial para associação de imagens de radar meteorológico e dados de descargas elétricas / A combination of weather radar images and electrical discharges using an artificial neural network
This work uses radar images together with data of electrical discharges derived from a lightning localization system taken with a Doppler Meteorological Radar as the input to a Neural Network (NN), in order to stablish the non-linear relationship between the reflectivity in the radar images and the atmospheric discharges. Associating these atmospheric discha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2003
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20. A combination of weather radar images and electrical discharges using an artificial neural network / Implementação de uma rede neural artificial para associação de imagens de radar meteorológico e dados de descargas elétricas
This work uses radar images together with data of electrical discharges derived from a lightning localization system taken with a Doppler Meteorological Radar as the input to a Neural Network (NN), in order to stablish the non-linear relationship between the reflectivity in the radar images and the atmospheric discharges. Associating these atmospheric discha
Publicado em: 2003
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21. Utilização de imagem de coerência SAR para classificação do uso da terra: Floresta Nacional do Tapajós / Use of SAR coherence image for land cover classification: Tapajós National Forest
The use of optical remote sensing images is not adequate for land cover classifying in tropical environments, due to the constant presence of clouds. The SAR images may be used under any weather and visibility conditions; however, the C-band SAR images have not been considered proper for performing the mapping of forest regions on account of the fact that th
Publicado em: 2002
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22. Discriminacao de lateritas mineralizadas em ferro no deposito de N1 (Carajas-PA) por radar imageador: uma avaliacao atraves de classificacao textural / Discrimination of iron ore laterites in the deposit N1 (Crajas - PA) using radar imagery: an evaluation through textural classification
The use of imaging SAR presents a high potencial for geological applications in cloudy cover regions, such as the Brazilian Amazon, due to the side viewing geometry and the longer wavelengths, which result in the enhancement of the terrain and the all-weather sensing capability. As the macro and micro topography are normally highlighted in the Syntetic Apert
Publicado em: 1998