Robot Submarine To Dive Deep In the Caribbean

Roland Piquepaille writes "According to BBC News, a new UK autonomous underwater vehicle (AUV), Autosub6000, will soon start to explore the world's deepest undersea volcanoes, located in the Caribbean. Autosub6000 has a range of up to 1,000 kilometers and has a maximum operating depth of 6,000 meters. It is 5.5 meters long, has a diameter of 0.9 meters, and is equipped with a high-performance GPS unit. For these two expeditions, each close to a month long, Autosub6000 will be joined by the Isis remotely operated vehicle, which is able to operate at a depth of 6,000 meters and grab animal specimens. Researchers from the National Oceanography Center in Southampton will lead these missions. They expect that 'one in every two animals they come across will be a species new to science' once the robots reach a depth of 3,000 meters." Specifications for the submarine (PDF) are also available.

The GPS is only used on the surface

[EmbeddedJanitor]

The robot will use sonar, compass and dead reckoning underwater. When it surfaces it can correct itself with GPS.

GPS will work down to a foot or so if you have the right antenna.

Re:GPS?

[MacJedi]

They're likely communicating with a surface bouys over a more appropriate frequency. The bouys then do the actual communicating with the satellites. See, eg: http://www.underwater-gps.com/uk/technology-GIB-concept.php [underwater-gps.com]

Re:The GPS is only used on the surface

[monsul]

GPS will work down to a foot or so if you have the right antenna.

And sooner than later, deeper than a foot: Underwater GPS patent [slashdot.org]

Granted, will probably be used only for military applications, but would be quite cool to have one of those while scuba diving

Re:Why only 6000m?

[Athena1101]

Many commercial AUVs are rated to, at most, 6000m. The tradeoffs there are business: basically none of the customers want it any deeper, because, like I said, that depth rating can handle almost the entire ocean. So if this group's main driver is availability of technology and components to work from to build their AUV, they're probably willing to focus on just the 3000m-6000m range to take advantage of that. This isn't to say it's not worth it at all, and there are vehicles that can go deeper. But the question was asked, "Why are these guys limited to 6000m?" It's not technologically infeasible to go deeper, but practically speaking, they don't need to in order to get the information they need. Tradeoffs.

Re:That isn't gps working underwater

[scdeimos]

The sub uses GPS for positioning on and near the surface. The rest of the way it's using inertial navigation. USL@NOC is also working on multibeam sonar so that the robot can assess its position using geologic features on the bottom (up to about 200m away I expect) for position keeping in a current.