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Signal/Data Processing Deception

Written By Massimo Annulli
568Signal/Data Processing Deception

False Range target (FRT):

A jammer based on a DRFM can generate false targets at distances much or less great than the distance of the true target; the system analyzes the trend over time of the radar PRI and predicts when the next pulse will be transmitted.
In any case, the objective is of generating false targets with a power at least equal but preferably greater than the skin echo of the true target at the output of the Signal Processing.

False Doppler Target (FDT)

The intent is to create one or more false target whose Doppler frequency is different from that of the true target to stress the data process of the victim system.
This technique consists of a coherent Repeater that produces signals spaced in frequency with respect to the true Doppler of the target:
Multiple frequencies can be generated with pulsed FM or AM.
Modulation lines can be transmitted in regular or random way or a single line can be emphasized and made to move in frequency in the Doppler band of the target radar.

OOK at processing rate

The intent is to cause DRR (Data Rate Reduction) in the victim radar by putting an OOK (On-off keying) waveform to a rate correlated to the time constant of the AGC or to the refresh time of the acquisition logics or other response times of the Data Processing.
This technique consists in on-off modulating the envelope of the transmitted signal (jamming or deception) the modulation can be square wave or triangular wave.
DRR is a term that refers to a broad category of techniques that aim to reduce or to degrade the performance of a radar or missile.

Signal Enhancement:

The goal is to create a false echo larger than the skin echo of the platform to be protected.
The implementation of this technique involves a Repeater that receives, amplifies and transmits the victim radar signal without imparting any form of modulation; it is used jointly to other techniques (cross pol) or to increase the effectiveness of some tactics based on decoys.

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