Acoustic Time Reversal Underwater Broadband

Acoustic time reversal can lead to transfer rates of up to 15 kilobits per second at a range of four kilometers. This is far better than existing techniques and, over long distances, even compares to what whales can do.

William Kuperman and colleagues at the Scripps Institution of Oceanography in La Jolla, California, US, and researchers from the NATO Undersea Research Centre in La Spezia, Italy, have been testing the technique in the Mediterranean.

Time reversal exploits the way undersea acoustic signals typically arrive clouded by echoes that travel at different speeds. For example, a "ping" may arrive as three separate sounds one that travelled directly, an echo from the surface and then an echo from the ocean floor.

If the receiver transmits the same sequence of sounds backwards, they will take the same routes back to the original source. But because the sound that took the longest to travel is sent first, the second-slowest next, and the fastest last, all three will arrive at about the same time at the original source.

In effect, they converge in time, reconstructing the original signal. The retransmitted sounds will create echoes of their own, but the original signal is strong enough to stand out, say the researchers.

A similar system is used in SeaQuest DSV, a television show that ran from 1993-96.


(SeaQuest DSV)

Via 'Time reversal' allows wireless broadband under the sea; thanks to Moira for writing in with the tip.

Scroll down for more stories in the same category. (Story submitted 6/27/2008)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 1 )

Related News Stories - (" Communication ")

Fog Computing (AKA Edge Computing) Ad Hoc Networks
'The tiny devices chirped their impulse codes at one another...' - Vernor Vinge, 1999.

Biggest HiSeas 'Mars Mission' Problem? No Internet
I think sf writers have this covered!

Sansar Social Virtual Reality Platform In 2017?
'And just as a daydreamer forgets his actual surroundings, and sees other realities...' - Vernor VInge, 1981.

Publishing Technologies In Science Fiction
In response to a reader question, a set of links related to publishing technologies in science fiction

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

3D Printed Artificial Muscles Are Stronger Than Yours
Bots don't need to work out.

Fog Computing (AKA Edge Computing) Ad Hoc Networks
'The tiny devices chirped their impulse codes at one another...'

Dubai Scorpion Police Hoverbike Ready To Pull Young Kirk Over
'Is there a problem, officer?'

HEXA Robotic Help For Plants
Then some unknown race had chanced upon the dreamers and decided to "help them out."

Korean Tesla Model S Video 'Excelsior' Is Indeed Our Motto
'Improving man by bringing him close to Nature, while they combine the sensations of coasting with the interest of seeing the country well...'

DIY Robot Shoots You In The Face
'...there were automatic guns that fired ligamine darts.'

A Bayesian Approach to Safe Imitation Learning For AIs and Robots
Um, how about that pension for the humans who serve as the models for robot behavior?

Qoobo Headless Robotic Therapy Cat Was Anne McCaffrey's Idea
'...used as surrogates in intense dependency cases.'

Autonomous Cars Talk To Each Other At MCity
'My cars talk to one another.'

PUFFER Robots - From Philip K DIck's Second Variety?
'Across the ground something small and metallic came, flashing in the dull sunlight of midday.'

Russian Space Garden
'We saw the gardens, flooded with artificial sunlight...'

Targeted Neuroplasticity Training For 'Downloading Skills'
'I know kung-fu.'

U of M's MCity To Feature Asimov's Automatobuses
Should you turn autonomous buses off?

Crazyflie Drone Swarm Technology
'...Programmed to hang in space in a hexagonal grid pattern.'

Our GodBot, Who Art In Cyberspace
Vaal hungers! We must serve him.

easyJet Short-Haul Electric Jets
Have a little faith, will you? They're working on it.

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.