MIT new invention: Diablo WiFi Perspective Technology

MIT has announced that researchers at the university have developed a system (WI-VI) that can detect human movement through WiFi signals. According to MIT, the system can detect the movement of the human body behind the reinforced concrete walls, and its future can be used as a low-priced detection radar. and named the invention the "rf-trap."

"The invention is useful, for example, to search for survivors in a fire building," The Massachusetts Institute of MIT said in an interview. ”

Principle of "rf-trap"

rf-capture "This system uses a normal WiFi signal to scan, and receives the body's reflected radio waves, thus detecting the distance between the receiver and the human body, and the movement of people. According to MIT, the WI-VI system works very similar to the common range radar system, but the range radar system needs to use the radio frequency band specially allocated for it, and the price is higher and the volume is larger, so the possibility of ordinary consumers is very low.

To collect wireless signals for the rf-capture:

The project is currently being held by the research team of Dina Katabi (Dina Katabi), professor of electronic engineering and computer science at MIT.

The team said in an interview, "It's not easy to develop the system, mainly because WiFi waves can reflect on furniture, tables, walls, and ceilings in the room, and the signals that go through the walls are just a few of the signals that are emitted." Professor Current's team developed a technique that suppresses the waves that bounce back from objects such as walls and captures only the waves that bounce back from the moving body, a technology that plays a key role in the development of the rf-capture system. ”

The "rf-capture" emits a wireless signal and obtains a reflection signal from different parts of the body, which, by analyzing the received signal, can eventually obtain a moving contour of the human body and record the trajectory of the contour. For the system principle of interpretation diagram

The most important part of the system is a WiFi transceiver with two transmitting antennas and one receiving antenna. Two transmitter antenna location design is completely opposite, but can emit the same intensity of the range with the radio signal. In this way, the reflected waves from the stationary objects will basically cancel each other out, thus detecting only the waves reflected back by the moving object. In many cases, moving objects are human, the system's detection resolution is relatively high, and even can detect the movement of the arm and so on.

Picture for researchers testing the system:

Future uses of the "rf-capture"

According to MIT, "The rf-trap" can detect whether someone is trapped in a house that collapsed after a disaster, or a life-and-death situation, even if the trapped person's body is not moving, only the arms and other parts move, the system can detect whether someone.

In addition, the system can be used for security purposes such as anti-theft and eavesdropping. Because the system can detect to some extent whether there are people behind the wall and there are several. According to MIT, if the system is installed on a portable device, you can also detect whether someone is hiding in the dark to track themselves.

According to the latest news, several companies have expressed interest in the project, as well as a lot of expectations of the project's prospects.

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* Reference Source: Theverge, DailyMail

MIT new invention: Diablo WiFi Perspective Technology