MENU

Noise Jamming (Radar)

Written By Massimo Annulli
552Noise Jamming (Radar)

The jamming waveform is created by a random electronic noise that modulates the carrier in order to appear at the Radar receiver as background noise to masking the desired radar echo.
The jamming waveforms can be matched to the radar BW (Spot Noise) or can have a very wide bandwidth (Barrage Noise, often applied to counter frequency agile radars).
An additional sweeping modulation (with triangular, sawtooth, Gaussian law) in the frequency domain can be superimposed.
The waveforms can be CW (Continuous Wave) or pulsed (noise cover pulse).
Noise Jamming can be used both defensively (Self-protection) and offensively (Stand-Off, Stand-In, Escort operations) to deny targeting information to an enemy.

Jamming is performed by a jammer equipment part of a Self-Protection Suite (Defensive Electronic Attack) or part of an Escort/Stand-off/Stand-in Suite (Offensive Electronic Attack).

Jamming is a non-coherent technique.

After the designation received by an external RWR (part of the same Suite) that analyzes the victim radar signal for key parameters, the jammer performs the following actions:

  • Generates the ECM signal internally by an independent oscillator such as a VCO (Voltage Controlled Oscillator) or by a DRFM (Digital radio Frequency memory), to optimally counter the victim radar.

  • Elaborates the generated carrier with superimposition of modulation (frequency, phase, amplitude, time etc…).
    Any
    applied modulation is specified through historic knowledge of victim radar parameters and some types of modulations (such as Doppler techniques) are not effective because the receiver typically cannot measure the radar RF to the required accuracy level.

  • Retransmits the manipulated signal towards the victim radar

The jamming action consists in the transmission of an “electronic noise” that is a random fluctuation or variation of an electromagnetic signal inducing in the radar receiver an effect similar to thermal noise (Figure 3).

The jammer transmitted noise, with the correct level of JSR (Jammer to Signal Ratio), is able to increasing the noise level in the radar receiver worsening the SNR (Signal to Noise Ratio) and impeding the correct detection of the echo signal.

Main jamming techniques are:

  • Barrage Noise

  • Spot Noise

  • Swept CW

  • Repeater Noise

  • Cover Pulse

    Figure 4: Noise jamming effect in a radar PPI

  • High Power Pulse

From the same Author
exagon-bg

Swept Amplitude Modulation (SAM)

READ MORE

exagon-bg

Cross-eye

READ MORE

exagon-bg

Radar Electronic Countermeasures Techniques

READ MORE

exagon-bg

Escort Jammer Task

READ MORE

exagon-bg

Signal/Data Processing Deception

READ MORE

exagon-bg

Angle Deception

READ MORE

exagon-bg

Radar Electronic CounterMeasures in Stand-in Jammer Task

READ MORE

exagon-bg

Amplitude Modulation in RECM techniques

READ MORE

exagon-bg

Cover Pulse (Radar)

READ MORE

exagon-bg

Radar Electronic CounterMeasures in Escort Jammer Task

READ MORE

exagon-bg

Self Protection Suite

READ MORE

exagon-bg

Threat Reaction

READ MORE

exagon-bg

Offensive Electronic Attack

READ MORE

exagon-bg

Range Gate Pull-Off (RangeDeception)

READ MORE

exagon-bg

Defensive Electronic Attack

READ MORE

exagon-bg

Self-Protection Task (airborne)

READ MORE

exagon-bg

Deception Jamming (Deception Techniques in Radar ECM)

READ MORE

exagon-bg

Electronic Protection (EP)

READ MORE

exagon-bg

Self-Protection for submarines

READ MORE

exagon-bg

Swept Noise (Radar)

READ MORE

exagon-bg

Inverse Gain

READ MORE

exagon-bg

Radar Electronic Countermeasures in Stand-Off Task (Stand-Off-Jammer)

READ MORE

exagon-bg

Spot Noise

READ MORE

exagon-bg

Stand-In Jammer Task

READ MORE

exagon-bg

Chaffs

READ MORE

exagon-bg

Self-Protection Task in Maritime Aviation Environment

READ MORE

exagon-bg

Stand-Off Jammer Task

READ MORE

exagon-bg

EWC4

READ MORE

exagon-bg

Barrage Noise

READ MORE

exagon-bg

Velocity Gate Pull-Off

READ MORE

exagon-bg

Radar Electronic Attack

READ MORE

exagon-bg

Noise Jamming (Radar)

READ MORE

exagon-bg

EW Command & Control EWC2

READ MORE

exagon-bg

Communication Electronic Attack

READ MORE

exagon-bg

Counter UAS/UAV

READ MORE

exagon-bg

Space EW

READ MORE

exagon-bg

Spoofing in Radar ECM

READ MORE

exagon-bg

Anti-Monopulse techniques - Cross-polarization

READ MORE

exagon-bg

Self-Protection task (maritime)

READ MORE

exagon-bg

Radar Electronic Countermeasures in Self Protection task

READ MORE

exagon-bg

Repeater Jamming

READ MORE

exagon-bg

Self-Protection Task for Surface Ships

READ MORE