Rotational Micro-Motion Modulated Jamming for Countering Isar Based on Intermittent Sampling Repeater

Abstract

Abstract-The intermittent sampling repeater jamming (ISRJ) can only produce fake point scatterers in the down-range, while the timevarying frequency induced by rotational micro-motion dynamics blurs the image in the cross-range. This paper focuses on the combination of the above two methods to counter the inverse synthetic aperture radar (ISAR). Based on the signal models of coherent ISAR signal processing, principles of the jamming are derived. The key jamming parameters and the selection criteria are determined by two steps. Finally, the validity of the proposed algorithm is demonstrated using the numeric simulations and simulations based on the measured data.

A Method against Interrupted-Sampling Repeater Jamming Based on Energy Function Detection and Band-Pass Filtering

“…Besides the studies on jamming methods, Feng made some researches on the performance of ISRJ on monopulse radar [14], dechirping radar [15], and the impact of ISJR on radar constant false alarm rate (CFAR) detection [16]. There are also many researches on 2-dimension (2D) ISRJ methods and their application on synthetic aperture radar (SAR) or inverse synthetic aperture radar (ISAR) [17][18][19].…”

Efficient filter design against interrupted sampling repeater jamming for wideband radar

“…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]. To prevent or complicate the radar target detection and recognition, much work has been done on the jamming techniques, especially some new jamming tricks that appear to counter the wideband radar system, such as the interrupted sampling repeater jamming (ISRJ) [1][2][3][4][5][6][7][8][9], false-target digital image synthesizer (DIS) [10][11][12], and scatter wave jamming (SWJ) [13][14][15]. As a coherent repeater jamming, ISRJ firstly proposed by Wang et al [1] can induce a train of false targets after the pulse compression (PC) without completely sampling and storing the whole radar pulse.…”

Simulation of two-dimensional ISAR decoys on a moving platform

“…Actually, there is no need for a jammer to sample the radar signal at such a high rate since the purpose of the jammer is not to reconstruct it but to interfere it. Inspired by this characteristic of sampling, the intermittent sampling repeater jamming (ISRJ) is presented and developed based on a receivetransmit time-sharing antenna [27][28][29]. The ISRJ reduces the time delay of retransmitting so that the preceded false point scatterers can be induced.…”

“…A set of point scatterers are induced after the de-chirping or matched filtering. However, the ISRJ can only introduce false point scatterers but not false-target images where each point spread function (PSF) is a scaled sinc function [29]. Since the ISAR is a technique of reconstructing a 2D intensity image of moving targets, a jamming method that can imitate 2D decoys is extremely needed.…”