MENU

Inverse Gain

Written By Massimo Annulli
941Inverse Gain

Inverse Gain Technique is a form of angle deception used against Conical Scan Radars and is aiming to mislead the tracker from the actual target angle by means of a false-target modulation in which transmitted peaks fall in the valleys of the real target modulation (Figure 1).

Conical scan is a two-dimensional sequential lobing operation in which a pencil beam with circular symmetry executes a scan about the tracker boresight axis: deceptive angle countermeasures against these radars need to synchronize their modulation patterns with the motion of the radar beam.

Inverse Gain implements the so-called On-Off Keying (OOK) technique: the jammer measures the envelope of the signal transmitted by the radar and synchronizes the transmission of the jamming in counter phase with respect to the received signal: the jammer transmission is maximum during the portion in which the envelope is minimum and vice versa.

Figure 1: Example of Inverse Gain

 

In presence of this form angle deception the automatic tracker shifts its boresight axis to a point on the line joining the real target and false target, closer to the stronger of the two.
In case of jammers designed to operate at a fixed (saturation output level) Inverse Gain deception technique can be implemented by transmitting constant amplitude jamming burst (Figure 2) timed to coincide with the valleys of the real target modulation.

Figure 2: Inverse gain with saturated Jammer

From the same Author
exagon-bg

Anti-Monopulse techniques - Cross-polarization

READ MORE

exagon-bg

Noise Jamming (Radar)

READ MORE

exagon-bg

Amplitude Modulation in RECM techniques

READ MORE

exagon-bg

Self-Protection Task (airborne)

READ MORE

exagon-bg

Self-Protection Task in Maritime Aviation Environment

READ MORE

exagon-bg

Radar Electronic Countermeasures Techniques

READ MORE

exagon-bg

Space EW

READ MORE

exagon-bg

EWC4

READ MORE

exagon-bg

Radar Electronic CounterMeasures in Stand-in Jammer Task

READ MORE

exagon-bg

Escort Jammer Task

READ MORE

exagon-bg

Self-Protection Task for Surface Ships

READ MORE

exagon-bg

Range Gate Pull-Off (RangeDeception)

READ MORE

exagon-bg

Threat Reaction

READ MORE

exagon-bg

Radar Electronic CounterMeasures in Escort Jammer Task

READ MORE

exagon-bg

Velocity Gate Pull-Off

READ MORE

exagon-bg

Defensive Electronic Attack

READ MORE

exagon-bg

Cross-eye

READ MORE

exagon-bg

Radar Electronic Countermeasures in Self Protection task

READ MORE

exagon-bg

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

READ MORE

exagon-bg

Stand-Off Jammer Task

READ MORE

exagon-bg

Self-Protection for submarines

READ MORE

exagon-bg

Self Protection Suite

READ MORE

exagon-bg

Electronic Protection (EP)

READ MORE

exagon-bg

Swept Amplitude Modulation (SAM)

READ MORE

exagon-bg

Swept Noise (Radar)

READ MORE

exagon-bg

Repeater Jamming

READ MORE

exagon-bg

Stand-In Jammer Task

READ MORE

exagon-bg

Deception Jamming (Deception Techniques in Radar ECM)

READ MORE

exagon-bg

Angle Deception

READ MORE

exagon-bg

Spot Noise

READ MORE

exagon-bg

Inverse Gain

READ MORE

exagon-bg

Chaffs

READ MORE

exagon-bg

Cover Pulse (Radar)

READ MORE

exagon-bg

Radar Electronic Attack

READ MORE

exagon-bg

Communication Electronic Attack

READ MORE

exagon-bg

Spoofing in Radar ECM

READ MORE

exagon-bg

Offensive Electronic Attack

READ MORE

exagon-bg

Counter UAS/UAV

READ MORE

exagon-bg

EW Command & Control EWC2

READ MORE

exagon-bg

Barrage Noise

READ MORE

exagon-bg

Self-Protection task (maritime)

READ MORE

exagon-bg

Signal/Data Processing Deception

READ MORE