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 -
China's Drone Fleet Flies In Formation
'Programmed to hang... in a hexagonal grid pattern.' - Neal Stephenson, 1995.
RFID Chipped Employees Of Three Square Market
'About a third of the people in Manhattan have replaced their Freedom Card with a radio-frequency chip...' - John Twelve Hawks, 2015.
SkEye Amazing Israeli Gigapixel Drone
'An eye that could not only see, but fly...' - Manly Wade Wellman, 1938.
Cyborg DragonflEye At Your Command
'The dragonfly responded like a toy airplane, taking off and heading east...'
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.
effie Automated Ironing Appliance
'Household Automata received an urgent task to develop production units of бытовые тканевые разглаживатели - a household fabric smoother.'
BabyX AI Real Enough For You
'...what's to keep me from showing face, Man? I'm showing a voice this instant... I can show a face the same way.'
We Could Downgrade Puerto Rico - And Thereby Save It
'It was cheaper to pay the refugees to go without up-to-the-minute equipment.'
Pegasus, Nvidia Supercomputer For Autonomous Driving
'...a 2045 convertible with a Hennis-Carleton positronic motor and an Armat chassis.'
Loihi Chip Mimics Human Brain's Neurons And Synapses
'You can hook a Thorsen tube into a control circuit... and the tube will "remember" what was done and can direct the operation...'
Self-Assembling Bacteria Build A Pressure Sensor
Nature is a master of fabricating structured materials consisting of living and non-living components.
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?'
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...'
HEXA Robotic Help For Plants
Then some unknown race had chanced upon the dreamers and decided to "help them out."
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.'
More SF in the News Stories
More Beyond Technovelgy science news stories