New 'invisible' radar with detector

US researchers have invented a new radar system almost impossible to detect because of its similarity to random noise. This radar can be used for military and police purposes.

(Photo: .livescience)

Like traditional radar, "invisible" radar detects an object by sending out a radio wave and absorbing reflected waves. It can go through solid walls like regular TV signals. The military can use this type of radar to detect enemy soldiers inside a building, or the police can catch speeding drivers.

In principle, the "invisible" radar uses a very low intensity signal over a wide frequency range, so a television or radio transmits to any frequency will interpret this radar signal as a very weak interference pattern. .

"Almost all radio receivers in the world are designed to eliminate random noise, in order to find the right signal," said lead researcher Eric Walton.

"Radios can hunt for this radar but will not find it. The new radar does not interfere with TVs, radios or other communications."

"In other words, the new device's bandwidth is thousands of times larger than the signals it can intervene," Walton explains.

Walton says the system costs less than $ 100.

T. An