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 ")

UK Police AI To Stop Criminals Before They Strike
'... the computing mechanisms that studied and restructured the incoming material.' - Philip K. Dick, 1956.

Chinese Face Recognition Mistakes Bus Ad For Jaywalker
'... the imprint of her image on the telephoto cell.' - Schachner and Zagat, 1931.

China's Social Credit System - A Facebook-1984 Mashup
'Prestige, face, mana, repute, glory: the Sirenese word is strakh.' - Jack Vance, 1976.

Chinese Watrix Gait Recognition Watching You Always
'... those pesky gait-recognition cameras.' - Cory Doctorow, 2008.

 

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

Wound Healing With Wearable Nanogenerators
'... forcing the energy transfer which allowed him to ... erase the other internal-external damage.'

Flying Dragon Robot Transforms In Mid-Air
Terrific prototype video.

Negative Matter Fluid Theorized In New Paper
'Of course, being negative matter, when you push it, it comes toward you..'

Grow Structures Upon Planetfall - Myco-Architecture
'They'll also start pulling in gases and liquids from the local atmosphere...'

MXene Hydrogel Skin For Robots Flexes And Senses
'The plastex swam and whirled like boiling toothpaste...'

EXPLORER, The First Total-Body Scanner
'The object is built up of an infinite series of plane layers, at the focus of the ray...'

UK Police AI To Stop Criminals Before They Strike
'... the computing mechanisms that studied and restructured the incoming material.'

Sonitus Audio Interface Positioned Beyond The Noise
'... an instrument having relatively small bit pieces adapted to be gripped between the teeth.'

Volvo's Self-Driving Mining Trucks
'A procession of automatic ore carts was racing over the bleak slag'

Audi Pop.Up Autonomous Electric Flying Car
'The cab was an egg-shaped bubble of light metals and plastics...'

Music Not Impossible (MNI) Vibrotactile Wearable Experience
Don't you want to experience the 'feely' effects?

Chinese Face Recognition Mistakes Bus Ad For Jaywalker
'... the imprint of her image on the telephoto cell.'

A Look Back At Apollo's Emergency Escape Vehicle
'A simple mechanism... it drove the iron ball through space like a ship.'

InMotion Glide 3 Electric Unicycle For The Last Mile
'...gyro-stabilized on a single wheel.'

China's Social Credit System - A Facebook-1984 Mashup
'Prestige, face, mana, repute, glory: the Sirenese word is strakh.'

Musk Declares Tesla Supercharger Capacity Will Double By Next Year
'Recharge the batteries... in almost every town and village...'

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.