Saturday, May 23, 2015

Pentagon mulls secret underwater recharge stations for submarine drones

23 May 2015
The US Navy is aiming within the next 10 years to be able deploy unmanned, underwater pods where robotic mini-subs can recharge undetected and securely upload intelligence to Navy networks, Sputnik reports.
"It's a 7-Eleven underwater," for robots, programmer manager Mike Wardlaw, of the Navy's Forward-Deployed Energy & Communications Outpost (FDECO), told Breaking Defense.
The pods will allow the unmanned underwater vehicles (UUVs) to dock, recharge, upload data and download new orders before shoving off again.
FDECO will be designed to overcome the two main limitations on UUVs: power and communications.
Full-sized submarines are powered by diesel engines or nuclear reactors, but robotic mini-subs rely on batteries, which carry much less energy density, or pound-for-pound power. So while a larger battery makes a UUV more powerful, it also makes it more expensive and easier to detect.
"How would you design a car to drive all the way across the country?" Wardlaw asked. "You can design (a) car that has a tanker behind it, and it's carrying all the fuel that it needs, or you can put some gas stations along the way. What I'm doing is, I'm creating the 7-Elevens or the gas stations along the way."
As for communications, former Navy undersecretary Bob Martinage explained to Breaking Defense: The UUV uses a short-range, high-bandwidth method to upload all its data to the FDECO while recharging. Then the FDECO transmits the data over a long-range, low-bandwidth method.
The technology could transmit data "several hundred miles," said Navy submariner Bryan Clark, much farther than could be done with just fiber optic cable on the sea floor.
FDECO would be most useful in the Pacific, particularly in the South China Sea, where China has repeatedly challenged US surveillance planes traveling in airspace near man-made islands Beijing is building.
Furthermore, unmanned systems do not have crew to capture. UUVs are also smaller and more difficult to detect than manned submarines, so the adversary is less likely to find them in the first place. 

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