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Every minute counts during water rescue operations. Whether responding to a person swept away by strong currents or someone struggling after a boating accident, rescue teams must not only locate the victim quickly but also bring them to safety. While unmanned surface vehicles (USVs) are increasingly being used to search large areas of water, most existing systems are designed primarily for surveillance and tracking rather than physically retrieving people from the water.
Researchers from the Shenzhen Institute of Artificial Intelligence and Robotics for Society (AIRS) and Stevens Institute of Technology have developed a robotic platform designed to bridge that gap. Called QuadBoat, the autonomous surface vehicle combines target tracking with the ability to approach and recover floating objects, making it a potential tool for future search-and-rescue missions.
The robot takes its inspiration from fishing spiders, which are able to move rapidly across calm water thanks to their long, water-repellent legs that distribute their weight across the surface. Rather than attempting to imitate this mechanism directly, the USV uses conventional buoyancy to remain afloat while adopting a four-legged structure that provides greater maneuverability and stability than many traditional boat-shaped robots.
According to TechXplore, each of the robot’s four legs can actively change position, allowing the platform to adjust its posture as it moves. An inverse kinematics controller coordinates the movement of the legs, while a cascaded Model Predictive Control (MPC)-PID system continuously calculates how the robot should steer and stabilize itself to follow a desired path. Together, these control algorithms enable the robot to navigate accurately, maintain stability and approach moving targets on the water’s surface.
To evaluate the design, the researchers carried out a series of pool experiments. They first tested the robot’s ability to execute precise movements and follow predefined routes before assessing its capability to visually detect, track and retrieve floating targets. According to the research team, the USV successfully completed both indoor and outdoor demonstrations, showing accurate trajectory tracking and reliable object pickup performance.
Although the project focuses on civilian search and rescue, the technology could also have defense and homeland security applications. Autonomous surface robots capable of locating and retrieving people or objects could support naval search-and-rescue missions, harbor security, disaster response and maritime surveillance. Similar platforms could also assist in recovering equipment, delivering emergency supplies or operating in hazardous waters where sending personnel would be too risky.
The researchers plan to continue refining the USV and evaluate its performance in more challenging environments, including rougher water conditions. If future testing proves successful, the concept could provide rescue teams with a new autonomous tool capable of not only finding victims but also helping bring them safely back to shore.
The research was published here.
