New technology detect human movement with WiFi

Massachusetts Institute Of  Technology To Develop New Technologies Detect Human Movement With WiFi

Beijing time on July 9 news,

Massachusetts Institute of Technology (MIT) announced that researchers have developed a WiFi radio waves through the body to detect the movement of the system (Wi-Vi) (Wi-Fi Vision) . According to the MIT introduced, the system can detect the concrete walls of the body movement of the back, which can be used as future low human detection radars.

Wi-Vi WiFi radio system to use an ordinary scan, and receives the radio wave reflected back the body to detect the receiver and the distance between the human body and human movement. According to MIT introduced, Wi-Vi system works with ordinary ranging radar system is very similar, but ranging radar systems require the use of specialized radio frequency band assigned to, and the price is higher, the volume is large, so ordinary consumers the possibility is very low.

This, MIT Department of Electrical Engineering and Computer Science, Professor Dina ·

 Kata ratio (Dina Katabi) research team used a low-cost WiFi, developed using human subjects ranging radar, and to achieve a low price, small size objectives.

Only detect a reflected wave from the moving object 
 

MIT said that the development of this system is not easy, mainly because WiFi radio in the room furniture, tables, walls and ceiling reflections occurring disorder, and radio signals through walls returned only rarely part of the transmitted signal. Kata than the professor's team developed a suppression reflected back from the walls and other objects of the waves, just grab the body from a mobile radio waves reflected back technology, this technology Wi-Vi system development has played a key role.

In the Wi-Vi system, the most important part is to have two transmit antennas and one receive antenna WiFi transceiver. Two transmitting antenna location opposite the design, but the same intensity emitted radio signals rangefinding. Thus, the reflection from a stationary object wavelet this will offset each other, so that only the moving object detected by the reflected waves. And in many cases the moving objects are human beings, the detection resolution of the system is relatively high, and even detect the movement of the arm and so on.

Kata than Professor Wi-Vi system design a variety of purposes, one of the most critical is the post-disaster rescue. According to MIT introduced, Wi-Vi system can detect whether someone trapped in the earthquake disaster and the collapse of the housing inner life and death situation, even if the trapped person's body does not move, only the arms and other parts of the movement, the system is able to detect whether someone.

In addition, the system can also be used for anti-theft and anti-eavesdropping security purposes. Because the system can be detected to some extent, and if someone behind the walls of a few people. According to MIT introduction, if the system is installed on a portable device to use, but also can detect whether someone hiding in the shadows track myself.

Microsoft's attention by

MIT, said researchers at Microsoft Research is very concerned about this point. Currently, Kinect Gesture input function such as the use of using infrared, or if the user is not in the middle of the front there is an obstacle, it will not be used. 

 

If we can achieve through Wi-Vi wave gesture input, gesture input will widen the scope of application