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August 22, 2018 04:10 pm

New Tech Lets Submarines 'Email' Planes

A way for submerged submarines to communicate with planes has been developed by researchers at MIT. From a report: At present, it is difficult for planes to pick up underwater sonar signals because they reflect off the water's surface and rarely break through. The researchers found an extremely high-frequency radar could detect tiny ripples in water, created by an ordinary underwater speaker. This could let lost flight recorders and submarines communicate with planes. Submarines communicate using sonar waves, which travel well underwater but struggle to break through the surface. Planes communicate using radio signals that do not travel well in water. At present, submarines can surface to send messages - but this risks revealing their location. Sometimes, buoys are used to receive sonar signals and translate them into radio signals. "Trying to cross the air-water boundary with wireless signals has been an obstacle," said Fadel Adib, from the MIT Media Lab. The system developed at MIT uses an underwater speaker to aim sonar signals directly at the water's surface, creating tiny ripples only a few micrometres in height. These ripples can be detected by high-frequency radar above the water and decoded back into messages.

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