See Through Walls With Wireless Networks

See through walls by using the way signal strength varies in wireless networks? It ought to be possible and now researchers at the University of Utah say that they can do it with variance-based radio tomographic imaging (VRTI).

According to their paper, VRTI images movement, not static changes in attenuation. In the image below, a human subject is taking small steps randomly around and through the space marked as (17.6, 21.3) in the graph shown below. The white spot shows where VRTI 'sees' the subject.


(Wireless network spying with variance-based radio tomographic imaging )

The basic idea is straightforward. The signal strength at any point in a network is the sum of all the paths the radio waves can take to get to the receiver. Any change in the volume of space through which the signals pass, for example caused by the movement of a person, makes the signal strength vary. So by "interrogating" this volume of space with many signals, picked up by multiple receivers, it is possible to build up a picture of the movement within it.

In tests with a 34-node network set up outside a standard living room, Wilson and Patwari say they were able to locate moving objects in the room to within a meter or so.

Interested in seeing through walls? Take a look at four different technologies - Prism 200, LEXID handheld, LifeReader and the DARPA Radar Scope.

Science fiction fans have enjoyed various versions of this technology for many years. Consider the Subphoton Search Ray from The Shining One (1937), the Probability Time Wave Tube from Elimination (1936) and the X-Beam Projector from Diamond Planetoid (1937).

From Through-Wall Motion Tracking Using Variance-Based Radio Tomography Networks via MIT's Technology Review.

Scroll down for more stories in the same category. (Story submitted 10/1/2009)

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 ( 0 )

Related News Stories - (" Surveillance ")

LA Subway Scanner, As Seen In 'Total Recall'
'I'm afraid to tell you this Mr. Quaid, but you have suffered a schizoed embolism...'

Amazon's Rekognition System Sees Criminals In Congress
'... the imprint of her image on the telephoto cell.' - Schachner and Zagat, 1931.

IJOP Integrated Joint Operations Platform China's Minority Report?
'All day long the idiots babbled, imprisoned in their special high-backed chairs...'

Kuri Robot Roams Your Home, Taking Pictures
'Small devices with cameras and sound equipment which could move freely...'

 

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

Sleeep PRO Earplug For Maximum Rest
'Merton... placed the electrodes of the sleep-inducer on his forehead.'

Inspired By Japan, Nap Pods For Hajj
It's always a good time for a nap.

Amphibio 3D Printed Gill Shirt
'... we can descend and live down there at one of those year-round aquatic resorts.'

How Do You Put An Asteroid Into Earth Orbit? Carefully!
'...she would have to be coaxed by another series of pats into a circular orbit.'

PD Aerospace Space Plane By 2023
'The sleek, tapered space shuttle lay immobile upon the private landing field...'

Foldimate Folds Your Clothes Perfectly
Look ma, my room is clean! I can hear you now.

Robots Help People Get Dressed, As Predicted In 1931
Yes, people of the future, robots will dress you.

International Space Station Leak Plugged - With Finger
'These tag-alongs search out stray leaks.'

Robot Snake Flies, Fights Fires
Just a prototype, but still amazing.

IPAL Chinese Robot Babysitter
'But Nanny is different...'

ZKZM-500 LASER Assault Rifle
'The Iranian reached back into the locker and got a pair of laserifles.'

LA Subway Scanner, As Seen In 'Total Recall'
'I'm afraid to tell you this Mr. Quaid, but you have suffered a schizoed embolism...'

Sion Electric Car Covered With Solar Panels
'It drew its power from six square yards of sunpower screens on its low curved roof.'

PAL-V Liberty Flying Helicopter Car
'...lifted themselves to skimming flight upon whirling helicopters."

Space Drones - UK's Effective Space To Launch Rocket Tugs
'Twenty rocket tugs towed it from its Earth hangar out into space.'

DIY Autonomous Robot Detects Trash
'The search-bug detached itself and rolled forward.'

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.