Welcome to the future.
A system is being developed by Dina Katabi, a professor in MIT’s Department of Electrical Engineering and Computer Science, and her graduate
student Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. “We wanted to create a
device that is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors,” Katabi
The system, called “Wi-Vi,” is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a
low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a
As a Wi-Fi signal is transmitted at a wall, a portion of the signal penetrates through it, reflecting off any humans on the other side. However,
only a tiny fraction of the signal makes it through to the other room, with the rest being reflected by the wall, or by other objects. “So we had to
come up with a technology that could cancel out all these other reflections, and keep only those from the moving human body,” Katabi says.
To do this, the system uses two transmit antennas and a single receiver. The two antennas transmit almost identical signals, except that the signal
from the second antenna is the inverse of the first. As a result, the two signals interfere with each other in such a way as to cancel each other out.
Since any static objects that the signals hit — including the wall — create identical reflections, they too are cancelled out by this nulling
Possible uses could be for disaster recovery, personal safety, gaming.
Wi-Vi, being presented at the Sigcomm conference in Hong Kong in August, could be used to help search-and-rescue teams to find survivors trapped in
rubble after an earthquake, say, or to allow police officers to identify the number and movement of criminals within a building to avoid walking into
It could also be used as a personal safety device, Katabi says: “If you are walking at night and you have the feeling that someone is following you,
then you could use it to check if there is someone behind the fence or behind a corner.”
But as many of us know, even with the good points to a device such as this, there is a downside also.
-Invasion of privacy-
Which seems to be the talk now a days.
Technology is moving and evolving extremely fast.
Hard trying to keep up with it.
Appears that much of the 'tech' stuff in the 80's movies is coming to light.
edit on 29-6-2013 by snarky412 because: (no reason given)