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Scientists use Wi-Fi signals to 'see' through solid walls.

London, October 3 (ANI): Scientists at the University of Utah The University of Utah (also The U or the U of U or the UU), located in Salt Lake City, is the flagship public research university in the state of Utah, and one of 10 institutions that make up the Utah System of Higher Education.  in the US have found a way to harness Wi-Fi signals to 'see' through solid walls.

According to according to
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

 a report in the Telegraph, the researchers said that the variation of radio signals in a wireless network can reveal the movements of people behind closed doors or even a wall.

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 Wilson and Neal Patwari, from the University of Utah, have used the principle of variance-based radio tomographic imaging.

The system works by measuring interference between the nodes of wireless devices.

If someone passes through that field, the device registers a change in the levels of resistance, and feeds that information back to a computer.

The system can currently only see about three feet through a wall, and is so far only capable of sensing motion.

At this stage, it is not sophisticated enough to generate an actual image of what lies beyond the wall, but the research team is confident that this feature could be developed in time.

The researchers said that the technology could be used in search and rescue operations, with emergency teams using the same radio technology used by Wi-Fi networks See wireless Ethernet and 802.11.  to build a web of sensors
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  • RTD - Resistance Temperature Detector or Resistance thermometer or Pt100
  • Microphone
  • Hydrophones
  • Seismometers
  • Photoresistor
  • Phototransistor
  • Infrared thermometer
  • Multi-User Multimodal Tabletop Interaction
  • Cationic Sensor
 around a disaster site, revealing the location of victims and survivors.

"We envision a building imaging scenario similar to the following. Emergency responders, military forces, or police arrive at a scene where entry into a building is potentially dangerous. They deploy radio sensors around (and potentially on top of) the building area, either by throwing or launching them, or dropping them while moving around the building," according to Wilson and Patwari.

"The nodes immediately form a network and self-localise, perhaps using information about the size and shape of the building from a database (eg Google maps Google Maps (for a time named Google Local) is a free web mapping service application and technology provided by Google that powers many map-based services including the Google Maps website, Google Ride Finder and embedded maps on third-party websites via the Google Maps ) and some known-location coordinates (eg using GPS)," they said.

"Then, nodes begin to transmit, making signal strength measurements on links which cross the building or area of interest. The received signal strength measurements of each link are transmitted back to a base station and used to estimate the positions of moving people and objects within the building," they added. (ANI)

Copyright 2009 Asian News International The Asian News International (ANI) agency provides multimedia news to China and 50 bureaus in India. It covers virtually all of South Asia since its foundation and presently claims, on its official website, to be the leading South Asia-wide news agency.  (ANI) - All Rights Reserved.

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Publication:Asian News International
Date:Oct 5, 2009
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