American researchers have developed a new radar system that is nearly undetectable because its signal resembles random noise. This type of radar can be used for military and law enforcement purposes.
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(Image: .livescience) |
Similar to traditional radar, the “invisible” radar detects an object by emitting a radio wave and receiving the reflected wave. It can penetrate solid walls just like regular TV signals. The military could use this type of radar to detect enemy soldiers inside a building, or law enforcement could catch speeding drivers.
In principle, the “invisible” radar utilizes signals with very low intensity across a wide frequency range, so a television or radio tuned to any frequency would interpret this radar signal as a form of very weak noise.
“Almost all radio reception devices worldwide are designed to filter out random noise in order to find the precise clear signal needed,” said Eric Walton, the research team leader.
“Radio receivers may search for this radar signal but will not detect it. The new radar also does not interfere with TV, radio, or other communication signals.”
“In other words, the frequency range of the new device is thousands of times broader than the signals it could potentially interfere with,” Walton explained.
Walton mentioned that the system costs less than $100.
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