Wi-Fi is a popular technology that allows an electronic device to connect to the Internet wirelessly using radio waves. Wi-Fi signals are nothing more than the carriers of information between the transmitter and the receiver. Wireless Vision (Wi-Vi) is a new technology similar to the same concept of Wi-Fi that allows you to see through the walls with the help of Wi-Fi signals. Wi-Vi allows us to track humans through the walls as well as behind closed doors. The Wi-Vi operation does not require any access to any device on the other side of the wall. Wi-Fi also allows us to see moving objects through walls and behind closed doors.
Do the Wi-Fi signals allow us to see through the walls? For many years humans have fantasized about X-ray vision and have played with the concept in comics and science fiction films. This article explores the potential of using Wi-Fi signals and recent advances in MIMO communications to build a device that can capture the movement of humans behind a wall and in enclosed rooms.
Law enforcement personnel can use the device to avoid ambushes and minimize casualties in isolation and hostage situations. Emergency responders can use it to see through debris and collapsed structures. Ordinary users can take advantage of the gaming device, intrusion detection, privacy monitoring of children and the elderly, or personal safety when entering dark alleys and unknown places
WI-VI is based on the principle of RADAR and SONAR (Doppler effect). RADAR is an object detection system that uses radio waves to determine the range, altitude, direction or speed of objects. It is similar to the way radar and sonar work, but without the expensive and bulky gear and the restricted frequencies required by radar. It depends on your own transmission signal.
The underlying concept of seeing through opaque obstacles is similar to the radar and sonar image. Specifically, when faced with a non-metallic wall, a fraction of the RF signal would cross the wall, reflect off objects and human beings, and come back printed with a signature of what is inside a closed room. (inside and outside the room) is reduced by three to five orders of magnitude. Even more challenging are the reflections of the wall itself, which are much stronger than the reflections of objects inside the room. Reflections off the wall overwhelm the receiver from analog to digital converter (ADC), which prevents the recording of minute variations due to reflections of objects behind the wall. This behavior is called "Flash Effect" because it is analogous to how a mirror in front of a camera reflects the flash of the camera and prevents the capture of objects in the scene. How can you overcome difficulties? The radar community has been investigating these, and has recently introduced a few ultra-wideband systems that can detect humans moving behind a wall and display them as spots that move in a faint background.