A Novel Jamming Method against SAR Using Nonlinear Frequency Modulation Waveform with Very High Sidelobes

Abstract

Synthetic aperture radar (SAR) systems have the capacity for day-and-night and all-weather surveillance, which has become increasingly indispensable for military surveillance and global comprehensive environmental monitoring. With the development of the high-resolution SAR imaging technique, studies on SAR jamming have also received much interest. Traditional jamming methods are based on linear-frequency-modulated (LFM) signals, and this method can achieve high main-lobe jamming gain. However, its sidelobe jamming energy is very low. To solve this issue, a novel nonlinear frequency modulation (NLFM) waveform design method for SAR jamming is proposed in this paper. Compared with LFM waveforms, the designed waveforms have the same main-lobe jamming gain and very high sidelobes, which can significantly improve jamming performance. Moreover, detailed simulation experiments were carried out to verify the effectiveness of the newly proposed jamming scheme.

Комбіновані Двофрагментні Радіолокаційні Сигнали З Лінійним Та Експоненціальним Законами Частотної Модуляції

“…Перші публікації, які демонстрували доцільність використання НЛЧМ сигналів, з'явилися ще на початку 60-х років минулого сторіччя [4]. У роботах останнього десятиріччя розглядаються аспекти застосування НЛЧМ сигналів для радіолокаційних засобів самого різного призначення -ультразвукова діагностика [10], гідролокація [11; 12], метеолокація [13], системи дистанційного зондування з синтезованою апертурою [14][15][16][17][18], радіоелектронна боротьба [19][20][21], найширше представлено системи виявлення повітряних цілей [6][7][8][9][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Hybrid Domain Efficient Modulation-Based Deceptive Jamming Algorithm for Nonlinear-Trajectory Synthetic Aperture Radar

“…According to the different jamming effects, active jamming techniques for SAR are divided into barrage jamming and deceptive jamming. Barrage jamming uses high-powered noise to attenuate the signal to jamming ratio within a specific region to cover up the real target [6][7][8][9].The deceptive jamming confuses target identification without causing enemy awareness by directly generating or modulating-retransmitting false target echo signals and implanting false electromagnetic features in SAR radar images [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Compared with barrage jamming, deceptive jamming is characterized by higher concealment, lower power consumption and more flexible application scenarios.…”

Advancing Stepped-Waveform Radar Jamming Techniques for Robust False-Target Generation against LFM-CFAR Systems

“…The modulation of radar waveforms has received extensive attention in the field of jamming applications [ 15 , 16 ]. Stepped-frequency and stepped-chirp techniques have been widely studied, involving the division of intercepted pulses into multiple consecutive segments with incremental changes in frequency or chirp rate.…”

“…While this is a valuable contribution, the method alone does not fully resolve the fundamental sensitivity issues associated with false target generation, such as uncertainties in target position and the signal-to-noise ratio. Song et al [ 15 ] conducted an implementation of a jammer using a digital radio frequency memory device, which employed randomized stepped frequency modulation. Their experiment showcased the potential for generating a high density of false targets.…”