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Concepts that blanket the radar with signals so its display cannot be read are normally known as jamming, while systems that produce confusing or contradictory signals are known as deception, but it is also common for all such systems to be referred to as jamming. There are two general classes of radar jamming, mechanical and electronic.
Contemporary radar systems can distinguish chaff from legitimate targets by measuring the Doppler effect; [4] chaff quickly loses speed after leaving an aircraft, and the resulting shift in wavelength of the radar return can be measured. To counter this, a chaff cloud can be illuminated by the defending vehicle with a doppler-corrected ...
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 ...
Interference techniques include jamming and deception. Jamming is accomplished by a friendly platform transmitting signals on the radar frequency to produce a noise level sufficient to hide echos. [1] The jammer's continuous transmissions will provide a clear direction to the enemy radar, but no range information. [1]
Chaff may be deployed over a large area of space, creating a large, radar-reflecting object that will obscure incoming warheads from defensive radar. Radar jammers are active radio transmitters that can be deployed on the decoys and the warhead to jam the frequencies used by defensive radars or literally blind them from seeing any warheads around.
Chaff/flare countermeasures dispenser, replaced AN/ALE-39: Tracor (now BAE Systems) AN/ALE-50: Little Buddy passive electronic countermeasure towed decoy: F-16 Fighting Falcon, F/A-18E/F Super Hornet, B-1B Lancer: Raytheon: AN/ALE-55: Fiber-optic radar jamming and deception towed decoy: F/A-18E/F Super Hornet: BAE Systems
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".
A combined MAWS/decoy/aerosole/chaff system is claimed by the developer to have the 85% to 95% probability to defeat a single attacking HARM missile. SPN-30 and Pelena-1 radar jamming systems are also used against airborne radars. [59] When using a prepared position for prolonged time, revetments might be used for TELs and additional equipment ...