Communicating underwater has always been a major challenge for robots.
Unlike on land, where wireless signals travel easily through the air, water absorbs and weakens many forms of communication.
This makes it difficult for underwater robots to share information, coordinate missions, and send updates back to human operators.
Now, researchers at the University of Florida have developed a new technology that could help solve this problem.
Their compact communication system, called BlueME, allows underwater robots to exchange information over long distances while using very little power.
The project was led by electrical and computer engineering professors Md Jahidul Islam and Adam Khalifa.
Their goal is to create communication systems that allow underwater robots to work together more effectively in environments where visibility is poor and traditional communication methods struggle.
At the heart of the system is a tiny magnetoelectric antenna specially designed for underwater use. Traditional underwater communication systems often require large antennas or high amounts of power. BlueME takes a different approach by using the antenna’s natural resonance to efficiently send and receive very low-frequency electromagnetic signals.
One of the key advantages of the system is its energy efficiency. The researchers designed BlueME to consume as little power as possible while maintaining reliable performance. At full operation, the system uses only about 10 watts of power, roughly comparable to the energy used by some small electronic devices.
The idea for the technology came from an unexpected source. Professor Khalifa studies tiny wireless medical devices that can be placed inside the human body. He realized that many of the same communication challenges found inside the body also exist underwater.
Because the human body is largely made of salty water, signals behave similarly in both environments. This insight helped the researchers apply knowledge from medical technology to ocean robotics.
The need for better underwater communication is growing as more autonomous robots are deployed in oceans, lakes, and coastal regions. Today, many underwater robots can only send limited status updates or must surface periodically to transmit data. These restrictions make real-time decision-making difficult and limit how effectively multiple robots can work together.
BlueME aims to change that. During ocean tests, the system successfully transmitted information over distances greater than 700 meters while maintaining its compact and energy-efficient design.
This capability could allow underwater robots to regularly report their progress during missions. Instead of waiting until a robot surfaces, operators could receive updates while the mission is still underway and make adjustments if necessary.
The researchers believe BlueME represents one of the first practical demonstrations of compact magnetoelectric antennas for underwater robotic communication. They have already filed a provisional patent and plan to continue improving the technology through additional testing and development.
While the system is still in its early stages, the team believes it could play an important role in the future of ocean exploration. Better communication could help fleets of underwater robots work together more effectively to inspect offshore infrastructure, monitor marine ecosystems, conduct scientific research, and support naval operations.
The researchers say this is only the beginning, but advances like BlueME could eventually transform how autonomous robots explore and operate beneath the waves.
