Friday, December 9, 2022

Fully autonomous drone system for search and rescue operations at sea

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In recent years, thousands of refugees and migrants all over the world have fled across the seas as a result of humanitarian crises around the world.

Now, a team of researchers from Chalmers University of Technology, Sweden, is working on a fully autonomous drone system that can increase the efficiency and speed of response in rescue operations at sea. The system relies on water and air-based drones working together, using a communication system to independently search an area, alert authorities to people in distress and provide basic assistance before crewed rescue vehicles have arrived.

The fully automated drone system consists of three components working together – a marine catamaran drone called Seacat, which serves as a base for the other drones, a fleet of winged aerial drones that monitor the surrounding area, and a quadcopter that can approach people in distress and deliver items such as supplies, healthcare aids or flotation devices. The quadcopter – a drone that has four engines and, therefore, the ability to hover – can carry loads weighing up to about two kilograms.

The system relies on water and air-based drones working together.
The system relies on water and air-based drones working together. Credit: Millie Skoglund, Chalmers

“The project is based on the simple principle that different drones have different advantages, and by allowing several different types of autonomous drones to work together, search efficiency and rescue response speed can be significantly improved, with the potential to save more lives,” says Xin Zhao, post-doc in the Fluid Mechanics Division at Chalmers.

The marine drone, Seacat, provides an internet uplink as well as a local communication link that is used to coordinate the flying drones. I also include a launch pad for fixed-wing drones. All airborne drones are equipped with cameras and a positioning system. All drones can move fully autonomously – the marine drone follows a predefined route with a closed-loop. Fixed-wing drones are automatically assigned to search areas according to an intelligent algorithm that makes the best use of the number of drones available.

When the fixed-wing drone detects objects in the water, the quadcopter is sent to the scene to take pictures. These pictures can then be sent to a rescue center on land via the marine drone. The rescue center can send out the quadcopter with supplies. When one of the winged drones runs out of battery, it is taken out of service and lands in the water near the Seacat drone, where it can be picked up and recharged automatically and then sent out again.

“So far, we have succeeded in carrying out a quadcopter landing on Seacat, and the winged drones have been built and are in the process of being assessed,” says Ola Benderius, Associate Professor in the Vehicle Engineering and Autonomous Systems Division, who has also led the project. “As part of a continuation of the project, we will put the system together and test it in its entirety out at sea.”

The project is being run within Chalmers’ research infrastructure Revere, with funding from the Transport Area of Advance. The project will come to an end in September 2022.

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