What is it about?
The well-known range-Doppler coupling property of the LFM (Linear Frequency Modulation) pulse compression radar makes it more vulnerable to repeater jammer that shifts radar signal in the frequency domain before retransmitting it back to the radar. The repeater jammer, in this case, benefits from the pulse compression processing gain of the radar receiver, and generates many false targets that appear before and after the true target. Therefore, the radar cannot distinguish between the true target and the false ones. In this paper, we present a new technique to counter frequency shifting repeater jammers. The proposed technique is based on introducing a small change in the sweep bandwidth of LFM waveform. The effectiveness of the proposed technique is justified by mathematical analysis and demonstrated by simulation.
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Why is it important?
We addressed countering some types of frequency-shift jammers for the first time using sweep bandwidth agility.
Perspectives
The proposed technique is better than other ECCM techniques that require a high SNR or assume that jamming pulses lag behind the true target echo that is not true in the case of instantly retransmitting the radar pulse after frequency-shifting.
Dr. Ing. Samer Baher Safa Hanbali
Higher Institute for Applied Science and Technology
Read the Original
This page is a summary of: Countering a Self-protection Frequency-shifting Jamming against LFM Pulse Compression Radars, January 2017, De Gruyter,
DOI: 10.1515/eletel-2017-0019.
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