A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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 |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 0 )
Related News Stories -
Amazon One Is Frank Herbert's Palm Lock
'A palm lock must be keyed to one individual's hand shape and palm lines.' - Frank Herbert, 1965.
Who Needs Dogs? Trained Bees Detect Explosives
'The directing neurological tissue that forms the basis of the swibble is alive...' - Philip K Dick, 1955.
Government In-Home Surveillance - Yes! Say Third Of Under-30 Adults
'The TV screen flicked to show a kitchen.' - Pournelle and Niven, 1981.
New Train Station Offers Minority Report-Style Signs
A whole new world awaits you, John Anderton!
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.
Prophetic Offers Lucid Dreaming Halo With Morpheus-1 AI
''Leads trail away from insertion points on her face and wrist... to a lucid dreamer...'
More Like A Tumblebug Than A Motorcycle
'It is about the size and shape of a kitchen stool, gyro-stabilized on a single wheel...'
Tesla Camera-Only Vision Predicted In 1930's SF
'By its means, the machine can see.'
First Ever Proof Of Water On Asteroids
'Yes, strangely enough there was still sufficient water beneath the surface of Vesta.'
Aptera Solar EV More Stylish Than Heinlein Steel Tortoise
'When confronted by hills, or rough terrain, it did not stop, but simply slowed until the task demanded equaled its steady power output.'
Gigantic Space Sunshade Would Fight Global Warming
'...the light of the sun had been polarized by two crossed fields so that no radiation could pass.'
Untethered Spacewalk's 50th Anniversary
'But that space walk of mine wasn't so very amazing.'
ESA Designs Huge Inflatable Moonbase
'It was like being inside a balloon; indeed, that was exactly where he was.'
AlphaGarden Robot Cares For Gardens Better Than Humans
'...a simple clock-set servok with pipe and hose arms.'
Let's Make Slaver Sunflowers! Engineering Plants To Reflect Light
'The mirror-blossom was a terrible weapon.'
TeslaBot Uber Driver (2024) And The Automatic Motorist (1911)
'Robots have worse problems than anybody'
DiffuseBot Uses Generative AI To Invent New Soft Robots
'It embodies several small-scale multiple stampers, apparently for dealing with sheet metal.'
Philips Smart Palm Recognition Smart Deadbolt
'A palm lock must be keyed to one individual's hand shape...'
BMind Smart Mirror from Baracoda
Mirror, mirror, on the wall, who has the greatest wellness of all?
Ballie Your AI Robot Companion From Samsung
Projects your content anywhere you like.
Holobox? Who Doesn't Want A Home Hologram?
'...there appeared standing upon the disk, the image of a man...'
More SF in the News Stories
More Beyond Technovelgy science news stories