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Radar jamming and deception is a form of electronic countermeasures (ECMs) that intentionally sends out radio frequency signals to interfere with the operation of radar by saturating its receiver with noise or false information.
The jammer's continuous transmissions will provide a clear direction to the enemy radar, but no range information. [1] Deception may use a transponder to mimic the radar echo with a delay to indicate incorrect range. [1] Transponders may alternatively increase return echo strength to make a small decoy appear to be a larger target. [1]
When jamming is strong enough, the radar receiver can detect it from a relatively low gain sidelobe. The radar, however, will process signals as if they were received in the main lobe. Therefore, jamming can be seen in directions other than where the jammer is located. To combat this, an omnidirectional antenna is used for a comparison signal ...
Angle deception jamming is an electronic warfare technique used against conical scanning radar systems. It generates a false signal that fools the radar into believing the target is to one side of the boresight, causing the radar to "walk away" from the target and break its radar lock-on.
Other radar-confusing techniques included airborne jamming devices codenamed Mandrel, Piperack, Jostle and Carpet. Mandrel was an airborne jammer targeted at the German Freya radars, [10] while Carpet targeted the gun-laying Würzburg radar. Ignorance about the extent of knowledge of the principle in the opposing air force led planners to judge ...
Estonia has accused neighbouring Russia of jamming GPS navigation devices in airspace above the Baltic states, echoing concerns from airlines that say they have been contending with such ...
If the radar was locked on to the aircraft, it will hopefully remain locked to this second pulse as the aircraft moves away from the original location. Eventually, the aircraft will fall outside the range gate and disappear, while the radar continues tracking the false signal. Thus, the false signal is said to "pull the range gate off the target".
Jammers or radio frequency “shields” are also a frequent topic of discussion in online forums dedicated to people who believe that the government or others are singling them out for in-depth ...