Unmanned Aerial Vehicles Uavs
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. ESTIMATION OF MAIZE BIOMASS USING UNMANNED AERIAL VEHICLES
ABSTRACT Unmanned aerial vehicles (UAVs) are a promising tool for technology development and transfer and for the economic success of the agricultural sector. The objective of this study is to assess the validity of biomass estimation in a commercial maize plantation using aerial images obtained by a UAV. The proposed methodology involved analyzing images ac
Eng. Agríc.. Publicado em: 09/12/2019
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2. Assessing Water Erosion Processes in Degraded Area Using Unmanned Aerial Vehicle Imagery
ABSTRACT The use of Unmanned Aerial Vehicles (UAVs) and Structure from Motion (SfM) techniques can contribute to increase the accessibility, accuracy, and resolution of Digital Elevation Models (DEMs) used for soil erosion monitoring. This study aimed to evaluate the use of four DEMs obtained over a year to monitor erosion processes in an erosion-degraded ar
Rev. Bras. Ciênc. Solo. Publicado em: 14/10/2019
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3. Adaptive Filtration of Parameters of the UAV Movement Based on the TDOA-Measurement Sensor Networks
ABSTRACT: In modern conditions unmanned aerial vehicles (UAVs) generate new classes of threats, including their use for terrorist purposes. A feature of modern UAVs is the ability to perform sudden maneuvers and to keep the same position in the point in space. For the description of the UAV movement with various types of maneuver it is used a rectangular coo
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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4. Longitudinal Aerodynamic and Stability Characteristics of High-Aspect-Ratio Unmanned Aerial Vehicles in Gust Response
ABSTRACT The aim of this work is to propose an accurate and reliable numerical simulation method of gust response, so as to analyze longitudinal stability characteristics of high-aspect-ratio unmanned aerial vehicles (UAVs) under gust response. Based on the dual-time stepping method, the unsteady Navies-Stokes equation was solved. By introducing grid velocit
J. Aerosp. Technol. Manag.. Publicado em: 03/06/2019
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5. Topographic modelling using UAVs compared with traditional survey methods in mining
Abstract The current developments with unmanned aerial vehicles (‘UAVs’) are revolutionizing many fields in civil applications, such as agriculture, environmental and visual inspections. The mining industry can also benefit from UAVs in many aspects, and the reconciliation through topographic control is an example. In comparison with traditional topograp
REM, Int. Eng. J.. Publicado em: 2018-07
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6. A Numerical Study on Smart Material Selection for Flapped and Twisted Morphing Wing Configurations
ABSTRACT: The developments of innovative adaptive structures on Unmanned Aerial Vehicles (UAVs), such as morphing wings, can potentially reduce system complexities by eliminating control surfaces and their auxiliary equipment. This technology has the potential of allowing a UAV to adapt to different mission requirements or to execute a particular mission mor
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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7. Image matching and classification for UAV navigation.
Unmanned aerial vehicles, known as UAVs, have evolved over the past two decades to sophisticated aircraft robots able to carry out surveillance, recognition, remote sensing and even attack missions. But there are not many alternatives of autonomous navigation systems for most of these aircraft which still require human intervention to navigate. Devices such
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2010
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8. Image matching and classification for UAV navigation.
Unmanned aerial vehicles, known as UAVs, have evolved over the past two decades to sophisticated aircraft robots able to carry out surveillance, recognition, remote sensing and even attack missions. But there are not many alternatives of autonomous navigation systems for most of these aircraft which still require human intervention to navigate. Devices such
Publicado em: 2010
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9. Análise dos modelos para cálculo de níveis de segurança relacionados à operação de veículos aéreos não tripulados. / Analysis of models for calculation of levels of security related to operation of unmanned aerial vehicles.
There are records of the use of Unmanned Aerial Vehicles (UAVs) used for military activities since the beginning of the 20th century. But that is not the only way to use it; the civil environment is also promising as to the use of this kind of aircraft. More studies and validations have to be performed about the alterations in the safety levels with the inte
Publicado em: 2009
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10. Proposta de uma arquitetura de controle híbrida fuzzy-pid para a realização de manobras em vants
No segmento aeronáutico, pesquisas evoluem para a criação de pequenas aeronaves controladas remotamente por meios eletrônicos e segmentos computacionais, sendo conhecidas como Veículos Aéreos Não Tripulados ou VANTs. Os VANTs possuem algumas vantagens, dentre elas, o custo operacional, em relação a aviões tripulados ou satélites, e a possibilidade
Publicado em: 2009
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11. On the use of unmanned aerial vehicle and the development of a data acquisition system of law cost for atmospheric sounding / Utilização de veículos aéreos não tripulados e desenvol-vimento de um sistema de aquisição de dados de baixo custo para sondagem atmosférica
This work describes the construction of an unmanned aerial vehicle (UAV) with electrical propulsion and instrumentation in order to obtain the vertical and horizontal profiles by measuring temperature, pressure, and GPS location, in surface atmosphere layer between two heterogeneous surfaces near terrain. Using embedded electronic, one developed and built a
Publicado em: 2008
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12. Métodos de análise de falhas e suas aplicações em veículos aéreos não-tripulados.
Esta dissertação tem por objetivo o estudo de métodos de análise de falhas e como os mesmos podem ser adaptados para Veículos Aéreos Não-Tripulados, mais conhecidos pela sigla UAVs (do inglês, Unmanned Aerial Vehicles). Este estudo foi divido em duas categorias: Métodos de Prevenção à Falha e Métodos de Tolerância à Falha. Para o estudo de Pre
Publicado em: 2008