ISEP - DM - Engenharia de Sistemas Computacionais Críticos
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Browsing ISEP - DM - Engenharia de Sistemas Computacionais Críticos by advisor "Tovar, Eduardo Manuel Medicis"
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- Authority Handover Procedure and Safety Decision Strategy in Unmanned Aerial VehiclesPublication . Ferreira, Gleizielly Alves; Tovar, Eduardo Manuel MedicisOver recent years, Unmanned Aerial Vehicles (UAVs) applications have become popular in different areas, such as aerial image acquisition, agriculture, inspection and maintenance, mapping, and delivery services. Some of these services require the ability to fly UAVs Beyond Visual Line of Sight (BVLOS) to cover greater distances. Data provided by onboard instruments control the BVLOS operation. The flight controller is responsible for directing the drone flight by controlling the motor’s speed and gathering sensor data. The relevant information about the aircraft, such as position, altitude, speed, and direction of flight, are transmitted via a radio link that informs an operator or a Ground Control Station (GCS). In some drone architectures, there is also an extra computer known as a companion computer or mission computer. They are responsible for providing more intelligence to the flight controller by changing flight parameters. The tasks running on a companion computer can add the capacity to make intelligent decisions during autonomous flight or emergencies, for instance, when the drone loses the radio link with GCS. In addition, for complex drone operations in larger coverage areas, it is necessary to transfer wireless communication links from one access point to another without experiencing connectivity loss. This procedure is known as Handover, and there is much research in this area. Therefore, studies in this field are still needed to find better solutions to avoid failures and increase public and regulatory acceptance of BVLOS operations with UAVs. In this context, the thesis intends to address solutions to the security authorization handover procedure and addresses security strategies in case of a loss of connection.
- A WSSL Implementation for Critical CyberPhysical Systems ApplicationsPublication . Rocha, Márcia Cunha; Tovar, Eduardo Manuel MedicisThe advancements in wireless communication technologies have enabled unprecedented pervasiveness and ubiquity of Cyber-Physical Systems (CPS). Such technologies can now empower true Systems-of-Systems (SoS), which cooperate to achieve more complex and efficient functionalities, such as vehicle automation, industry, residential automation, and others. However, for CPS applications to become a reality and fulfill their potential, safety and security must be guaranteed, particularly in critical systems, since they rely heavily on open communication systems, prone to intentional and non-intentional interferences. To address these issues, in this work, we propose designing a Wireless Security and Safety Layer (WSSL) architecture to be implemented in critical CPS applications. WSSL increases the reliability of these critical communications by enabling the detection of communication errors. Otherwise, it increases the CPS security using a message signature process that uniquely identifies the sender. So, this work intends to present the WSSL architecture and its implementation over two different scenarios: over Message Queue Telemetry Transport (MQTT) protocol and inside a simulation environment for communication between Unmanned Aerial Vehicles (UAVs) and Ground Control Stations in case of Beyond Visual Line of Sight (BVLOS) applications. We aim to prove that the WSSL does not significantly increase the system payload and demonstrate its safety and security resources, allowing it to be used in any general or critical CPS.