Navegando por Assunto "Drone"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Intelligent positioning of drones via metaheuristic optimization algorithms for maximizing signal coverage area in forested environments
(Universidade Federal do Pará, 2022-01-31) FERREIRA, Flávio Henry Cunha da Silva; ALCÂNTARA NETO, Miércio Cardoso de; http://lattes.cnpq.br/0549389076806391; ARAÚJO, Jasmine Priscyla Leite de; http://lattes.cnpq.br/4001747699670004
This dissertation aims to provide a metaheuristic approach to drone array optimization applied to coverage area maximization of wireless communication systems, with unmanned aerial vehicle (UAV) base-stations. For this purpose, two types of networks utilizing UAVs have been analyzed: a standard Wi-Fi network operating at 2.4 GHz, and a low-power wireless area network (LPWAN), both considering medium to high-density forest environments. LPWAN are systems designed to work with low data rates but still keep, or even enhance, the extensive area coverage provided by high-powered networks. The type of LPWAN chosen herein is LoRa, which operates at an unlicensed spectrum of 915 MHz, and requires users to connect to gateways in order to relay information to a central server – in this case, each drone in the array has a LoRa module installed to serve as a non-fixated gateway. In order to classify and optimize the best positioning for every UAV in the array, three concomitant bioinspired optimization methods have been chosen: the cuckoo search (CS), the flower pollination algorithm (FPA) and the bat echolocation algorithm (BA). All of these methods have a search space distribution based on Lévy / Mantegna flights (CS, FPA) and normal distribution (BA), and present distinct performance results for both drone array network cases. Positioning optimization results are then simulated and presented via MATLAB, first for the Wi-Fi network and later for a high-range IoT-LoRa network. An empirically adjusted propagation model with measurements carried out on the UFPA campus was developed to obtain a propagation model in forested environments. Finally, drone positioning utilizing the propagation model corrected with measurements is compared with the positioning using the classical theoretical model, showing that the corrected model is more efficient in representing the forest environment than the classical model usually used in recent publications.
Acesso aberto (Open Access)
Tecnologia ambiental na gestão de recursos naturais: o “voo” tecnológico da fiscalização mineral do estado do Pará
(Universidade Federal do Pará, 2015-11-18) SAMPAIO FILHO, Inaldo de Sousa; FARIAS, André Luís Assunção de; http://lattes.cnpq.br/5310171409459863
The technology features of unmanned aerial vehicles (UAVs) potentiate its civil use in several areas. Glimpsing the potential use in mineral inspection area of this technology, it was acquired by the federal competence agency in the granting and mineral inspection of Pará State. However, the availability and the fact to acquire such technology are not sufficient for success in their use. The success or failure is directly related to the way that this technology is managed. This research aimed to analyze the process of incorporating this technology as mineral inspection tool by the National Mineral Production Department of Pará State (DNPM-PA). For this purpose, used methodological approach based on technological innovation management processes of Nuchera, COTEC Foundation and Tidd and Bessant. About the research procedures, bibliographical and documentary surveys were conducted, interviews and application of free questionnaires for case study. The research development showed that, despite the potential of UAVs as mineral inspection tool, the technology is not getting incorporated strategically of Pará State. Stands out that the inspection is a fundamental part in the natural resources management, acting on the control and monitoring of environmental impacts from the mining activity, and that the spread of this technology will contribute to the strengthening of inspection activities in the state, since the insertion of UAVs is performed within the technological innovation management concepts.
Acesso aberto (Open Access)
O uso de Veículos Aéreos Não Tripulados (VANTs) para inspenções de segurança em barragens: estudo exploratório UHE Tucuruí
(Universidade Federal do Pará, 2021-05-28) EL BANNA, Kamila Dias Bernardes; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192
The main objective of this research is to verify the applicability of remote sensing by Unmanned Aerial Vehicles (UAVs), or popularly known as (drones) to aid in the safety of security in hydroelectric dams. It highlights the role and importance of technology as a means of innovation, for this application, as an exploratory study of the UHE Tucuruí. Some signs of deterioration or cracking, for example, can only be identified with visual inspections. For this reason, they are irreplaceable in dam safety control. In this context, the use of the UAV is very useful in these inspections, since its use makes this activity faster and safer, as it allows the verification of regions of the dam that are difficult to access, thus enabling full documentation of the dam's conservation status, in addition to the possibility of adapting sensors of different types and applicability, thus helping to provide more detailed information. The UAV, used for this research, satisfactory results for the evaluations to which it was exposed. Images with adequate quality and sequences were generated, so you can easily observe all the characteristics of the dam surface, thus providing a good support in the operation activities. In addition to supporting the dam safety assessment, the images generated can be gathered and used as a basis for other photographic surveys.