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WiFi signal

A Wi-Fi signal allows you to “see” through walls.
A German researcher has developed his technique of three-dimensional mapping of enclosed spaces. All you need is a wifi transmitter, that could come within your wireless or fibre broadband package from an ISP like Atlantek Computers LTD.
A researcher at the Technical University of Munich used radio waves from a WLAN transmitter to create his three-dimensional image of a real object. This created a hologram similar to the holograms seen in science fiction movies. This technology allows viewers to “see” inside a room using the Wi-Fi signal.
Our homes, galleries, clubs and parks:
Today, almost everything around us is covered by his Wi-Fi. On the one hand, many appreciate this comfort. On the one hand, it could possibly be detrimental to our health, and it turns out that this is not the only reason to fear it. and developed techniques that can even distinguish them from each other.
Stand on the other side of the wall. To see a person’s silhouette, researchers use the reflection of wireless network waves bouncing off the body. The technology, called RF capture, is so sensitive that it can even track the movements of a person’s hand and identify different people with just a “Wi-Fi silhouette” (i.e. distinguish people in an image). identify, not just do).
how does that work? Researchers activate a device that sends a wireless signal to the other side of the wall. The waves “penetrate” a person’s body and bounce off a device that records the reflections and sends the results to a computer program. The latter cleans up the image and prepares the data to show the image of “life” behind the wall. HF correspondent
Of course, waves are not just a reflection of humans. First, the device takes multiple images to reduce the effects of random noise and locate fixed elements behind the wall. A corresponding algorithm then analyzes the image and locates different parts of the body.
Researchers can use machine learning techniques to train algorithms to detect subtle differences in human body shape. This allows you to distinguish between people in an image. During testing, researchers were able to identify 15 people behind a wall with nearly 90° accuracy. Wi-Fi standard
norms use the same frequency bands as Bluetooth transmitters and receivers, microwave ovens, cordless phones, weather radars, surveillance cameras, and many other devices.
Researchers claim their technology can track objects with millimeter precision. The German researchers’ method analyzes changes in the microwave signals that make up the Wi-Fi signal. The creation of optical holograms requires advanced laser technology, whereas the creation of microwave beam holograms from Wi-Fi transmitters requires only a fixed antenna and a mobile antenna acting as a reference antenna. It doesn’t matter if the radio signal is encrypted or not.
Until now, microwave imaging required a dedicated high-bandwidth transmitter. The German researcher chose only a few of his typical WLAN transmitters for home use. Researchers say Bluetooth and cell phone signals can also be used. The technology already exists to locate people outside a building. This technology was introduced a few years ago. The human body distorts the signal. It acts like a screen. By measuring the changes in the signal, a person’s location can be determined. The novelty of the German researchers’ technique is that it can provide an image of the whole room using a Wi-Fi signal or the holographic processing of mobile phones. 

– This technology allows us to create a three-dimensional image of the environment, as if we were looking at microwaves with our own eyes. Ultimately, the encoded signal, in a way, sends an image of the environment to the outside world. But the process “is unlikely to be used to probe human beds, at least not in the near future,” says Reinhard. “This technology has been a dream of mine for years. Spy. Of course, that’s the first implication that comes to mind, but the technology can be used in many areas, such as: B. Filming areas where building security, surveillance, and constant presence may be an issue.

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