A Robust Anti-Jamming Method to Counter Shift Frequency Based Jamming False Targets

Shift frequency jamming (SFJ) is a sophisticated electronic countermeasure (ECM) technique, to disrupt the operation of contemporary linear frequency modulated (LFM) radars. This deception jamming method manipulates the intercepted radar signal to introduce multiple false targets, and retransmits it back to the target radar. In this paper, an effective electronic counter-countermeasure (ECCM) technique is proposed to neutralize the effects of SFJ. The proposed antijamming technique is based on incorporating variations in the chirp rate of LFM waveform. The effectiveness of the proposed technique is justified by mathematical formulation, and extensive simulations in different scenarios. The proposed anti-jamming methodology efficiently extracts the true target from multiple SFJ false targets. Finally, numerical results and analysis are carried out to demonstrate the authenticity of the proposed ECCM framework.