A new antenna system has been designed to improve underwater robot-to-robot communication in murky or deep waters. The University of Florida researchers have developed BlueME, which is a compact and energy-efficient magnetoelectric antenna. 

It would allow autonomous underwater vehicles (AUVs) to whisper data to one another over distances exceeding 700 meters (2,296 feet).

“Efficiency is super critical. Our design benchmark was to keep power consumption very low, ideally lower than a standard stereo camera system, while maintaining robust communication performance. Our compact, energy-efficient BlueME system achieves that balance, operating around 10 watts of power at maximum capacity,” said Dr. Md Jahidul Islam, who led the project. 

Working underwater

The project’s unique edge stems from its cross-disciplinary leadership. Dr Islam is a veteran researcher in marine robotics. His colleague, Dr. Adam Khalifa, spends his time designing miniature, wireless medical implants meant to be injected into human tissue.

Water is a nightmare for wireless signals. Saltwater absorbs radio waves rapidly, meaning conventional electronics require immense power or massive, unfeasible antennas to transmit information through the surf.

But while looking at the physics of transmitting data through muscle and bone, the team had an epiphany.

“I’ve spent years designing miniature wireless implants and studying efficient power transfer in highly conductive environments,” Khalifa said. “At one point, it clicked that many of the same physical challenges inside the human body also exist underwater. Our body is effectively made of lightly salted water. That realization opened the door to thinking about ocean communication in a completely different way.”

Coordinated subsea drone missions face a massive roadblock today. Most subsea drones can only trade sparse, primitive status blips.

Hence, sharing complex mission data or receiving new instructions forces the drones to halt operations and swim all the way back to the surface. It is slow and highly inefficient.

BlueME bridges this gap.

Myriad applications

Instead of forcing a brute-strength signal through the water, BlueME utilizes a array of magnetoelectric antennas. These components vibrate at their own natural mechanical resonance frequency. This lets them effortlessly push out very low-frequency (VLF) and low-frequency (LF) electromagnetic signals that slip right through murky water, completely undisturbed by obstacles, mud, or shallow-water chaos.

The BlueME system features a highly efficient hardware profile, drawing a maximum of just 10 watts of power — less than a standard stereo camera system. Despite this minimal footprint, it maintains high-fidelity, robot-to-robot communication links at distances exceeding 700 meters. 

Furthermore, unlike other acoustic sonar or laser optics, its low-frequency electromagnetic signals remain completely unaffected by floating silt or underwater acoustic echoes.

It may be the early days of development, but the team is confident. The uses are many. Navy fleets could deploy cooperative drone swarms to sweep for hazards without exposing humans to danger. Offshore energy companies could automate structural safety checks on deep-sea pipelines. Environmental scientists could dynamically track delicate shifts in ecosystems.

“Imagine the robot pings you back every 10 minutes on how the mission is going, and the operator can make real-time decisions and maybe adapt the mission,” Islam said.

The team has already filed a provisional patent for the technology. Now, they are actively pursuing funding and industrial partnerships to scale the prototype and get it mounted onto commercial autonomous submarines. 

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