Abstract
Interrupted sampling repeater jamming (ISRJ) is an effective coherent jamming, which can induce false high-resolution range profile (HRRP) and image to greatly complicate the target detection and recognition of wideband radar. To counter ISRJ, an efficient filter is designed based on the time-frequency (TF) characteristic differences between target echo and ISRJ. Meanwhile, a feasible jamming suppression scheme is proposed, which not only could eliminate ISRJ but also could reserve the target echo. The main emphasis is that the received echo suppressed by our scheme is similar with the true target’s HRRP on the basis of high correlation coefficient (CC) and large signal-jamming-to-noise ratio (SJNR) improvement factor. Simulation results are covered to illustrate the feasibility and validness of jamming suppression.
Highlights
Considerable attention has been paid to the electromagnetic jamming and anti-jamming for radar system in the electronic countermeasure (ECM) community over the past two decades [1,2,3,4,5]
We focus on the Interrupted sampling repeater jamming (ISRJ) against wideband de-chirping linear frequency modulation (LFM) radar, put forward an efficient filter for the extended target on the principles of timefrequency (TF) characteristic differences via short-time Fourier transform (STFT)
6 Conclusions Increasing attention has been paid to the ISRJ, which can greatly complicate the target detection and recognition of wideband radar
Summary
Considerable attention has been paid to the electromagnetic jamming and anti-jamming for radar system in the electronic countermeasure (ECM) community over the past two decades [1,2,3,4,5]. The strategy was only based on the ISRJ model of single point target, and the interrupted pulse samples were repeated once. (1) The proposed filter expands the jamming suppression approach for the extended target and is more suitable for the ISRJ against wideband radar. (3) We expand the analysis of jamming suppression effects on ISRJ with different orders, delayed time, duty ratio, JSR, and SNR. The interrupted sampling function of DRFM-based repeater jammer can be depicted as a rectangle envelope pulse train p(t) with the duration τ and interval Ts [1]. Compared with the first two types of ISRJ, the circular one has some extra requirements, such as more restored space and more random repeater order It makes the DRFM-based repeater jammer more complicated. The direct repeater jamming and repetitive one are more common, and their suppression performances have been investigated in this paper
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