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 ")

Birds Aren't Real - Wake Up, California! (With Bird Watching Guide)
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.' - Philip E. High, 1968.

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...'

 

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

SWEEPER Robot Peter Piper Picking Peppers
'... little machines, that went from plant to plant, apparently on caterpillar tracks, cutting off the ripe fruit.'

Oil from Algae - Can It Be Done?
'We dump everything that's waste into the tanks, pump the oil off the top.'

Moving Whole Planets, Revisited
There was a lot of work done on this idea over the years.

Disney Keeps Backups Of Star Wars Franchise Actors
'She is a personality-construct, a congeries of software agents...'

Farming In Space Starts With Mycorrhiza
'The inner leaves were beginning to curl faster than the outer leaves.'

Jaguar I-Pace Audible Vehicle Alert System For EVs
'Of course not a vehicle moved by means of internal explosions of a derivative of rock oil...'

Autonomous 'Fiberbots' Weave Large Structures
'It extrudes material like a spider.'

Birds Aren't Real - Wake Up, California! (With Bird Watching Guide)
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'

Self-Healing Material Pulls Carbon Out Of The Air
'... could seal the punctures.'

IRL Glasses Block Screens, Limit Vision To Real Life
'If you couldn't see the ads, how would you know what was fashionable?'

Testing The Single-Person Spacecraft
'...the lower part of the suit was simply a rigid cylinder.'

Shapeshifting Materials Transform By Light
'Its lines wavered, flowed, and then painfully reformed.'

Fully Automated Farm Iron Ox Hydroponics
'Had these machines in some incredible fashion been provided with brains?'

BrainNet Social Network Of Brains
'I used my implant to tell MILLIE what we wanted and she took care of it'

Phil Nuyttnn's City Under The Sea
'Under the lower roof there was no water, but a clear and luminous atmosphere...'

IONITY Opens First 10 Fast-Charging Stations
'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.