Fast computers, 5G networks and radar that passes through walls are bringing ‘X-ray vision’ closer to reality
Within seconds after reaching a city, earthquakes can cause immense destruction: Houses crumble, high-rises turn to rubble, people and animals are buried in the debris.
In the immediate aftermath of such carnage, emergency personnel desperately search for any sign of life in what used to be a home or office. Often, however, they find that they were digging in the wrong pile of rubble, and precious time has passed.
Imagine if rescuers could see through the debris to spot survivors under the rubble, measure their vital signs and even generate images of the victims. This is rapidly becoming possible using see-through-wall radar technology. Early versions of the technology that indicate whether a person is present in a room have been in use for several years, and some can measure vital signs albeit under better conditions than through rubble.
I’m an electrical engineer who researches electromagnetic communication and imaging systems. I and others are using fast computers, new algorithms and radar transceivers that collect large amounts of data to enable something much closer to the X-ray vision of science fiction and comic books. This emerging technology will make it possible to determine how many occupants are present behind a wall or barrier, where they are, what items they might be carrying and, in policing or military uses, even what type of body armor they might be wearing.
These see-through-wall radars will also be able to track individuals’ movements, and heart and respiration rates. The technology could also be used to determine from a distance the entire layout of a building, down to the location of pipes and wires within the walls, and detect hidden weapons and booby traps.
See-through-wall technology has been under development since the Cold War as a way to replace drilling holes through walls for spying. There are a few commercial products on the market today, like Range-R radars that are used by law enforcement officers to track motion behind walls.
How radar works
Radar stands for radio detection and ranging. Using radio waves, a radar sends a signal that travels at the speed of light. If the signal hits an object like a plane, for example, it is reflected back toward a receiver and an echo is seen in the radar’s screen after a certain time delay. This echo can then be used to estimate the location of the object.
In 1842, Christian Doppler, an Austrian physicist, described a phenomenon …….
Source: https://gcn.com/articles/2021/05/25/x-ray-vision.aspx