Defesa de Exame de Qualificação – Laura Michaella Batista Ribeiro – 8/4/2019
| Defesa de Exame de Qualificação | |
| Aluno | Laura Michaella Batista Ribeiro |
| Orientador | Prof. Leandro Buss Becker, Dr. – DAS/UFSC |
| Data
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8/4/2019 14h30 (quarta-feira)
Sala PPGEAS II (piso inferior) |
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Banca |
Prof. Carlos Barros Montez, Dr. – DAS/UFSC (presidente);
Prof. Eduardo James Pereira Souto, Dr. – UFAM; Prof. Ricardo Alexandre Reinaldo de Moraes, Dr. – PPGEAS/UFSC. |
| Título
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Multi-UAV System using Heterogeneous Wireless Networks |
| Abstract: Missions involving more than one unmanned aerial vehicle ({UAV}) typically require the exchange of information between such vehicles. For instance, it is common for UAVs to share their state of execution with each other in a dynamic way (i.e. during the execution of the mission) to support cooperative and collaborative missions.
The survivability and quality of communication of the network composed of mobile nodes are important research challenges that ensure the exchange of messages in a dynamic way, since they are necessary for nodes to have strong connectivity with the network to transmit data among themselves, with reliability in packet delivery to meet the communication requirements of each payload. To propose a solution to the problem of survivability and connectivity in these networks, this thesis proposes a heterogeneous wireless communication system for missions involving multiple UAVs, called HetMUAVNet. HetMUAVNet consists of two modules: survivability scheme and interface manager. The survivability scheme checks whether or not a node is strongly connected to the network, from an algorithm that validates the position of the UAV nodes by classifying them in different wireless regions (acceptability, rejection and uncertainty regions) according to neighboring UAVs nodes position. A network range extension algorithm verifies when a node is in regions of uncertainty or rejection, and uses the neighboring nodes for packet relay and re-positioning. The interface manager module applies a heuristic that allows the decision making between two standard and wireless communication interfaces, IEEE 802.11n (WiFi protocol stack) and IEEE 802.11p (WAVE protocol stack) according to the type of packet to be sent and the environment conditions sensed from the two frequency bands, 2.4 GHz and 5.9 GHz. As preliminary results of the present work, a simulation scenario was elaborated considering the different speeds applied to the nodes and the communication between them, through the wireless communication interfaces, comparing their performance in terms of packet delivery rate (PDR), overhead, received signal strength(RSS), delay, fading effects, signal to noise ratio(SNR), and time between packet inter-frame reception(PIR). The objective of the experiment is to evaluate and define important characteristics in the data traffic and behavior of these networks, highlighting characteristics that must be observed in the search for guaranteed communication survival and reliability in their connections. The results highlight the importance of a solution that integrates different communication technologies and the need for range extension techniques to maintain effective communication between each node. |
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