Effect of cosinusoidal phase-modulated scatter-wave jamming to the jamming suppression of SAR dual-channel cancellation

Yunpeng ZHANG; Daping BI; Yang ZHOU; Bo ZHANG; Mingxing FANG

doi:10.11834/jrs.20197114

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Effect of cosinusoidal phase-modulated scatter-wave jamming to the jamming suppression of SAR dual-channel cancellation
Vol. 23, Issue 1, Pages: 99-107(2019)
Published： 2019-1 ，

Accepted： 28 August 2017
DOI： 10.11834/jrs.20197114

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张云鹏, 毕大平, 周阳, 张博, 房明星. 2019. 余弦调相散射波干扰对SAR双通道对消干扰抑制的影响. 遥感学报, 23(1): 99–107

Zhang Y P, Bi D P, Zhou Y, Zhang B and Fang M X. 2019. Effect of cosinusoidal phase-modulated scatter-wave jamming to the jamming suppression of SAR dual-channel cancellation. Journal of Remote Sensing, 23(1): 99–107
张云鹏, 毕大平, 周阳, 张博, 房明星. 2019. 余弦调相散射波干扰对SAR双通道对消干扰抑制的影响. 遥感学报, 23(1): 99–107 DOI： 10.11834/jrs.20197114.

Zhang Y P, Bi D P, Zhou Y, Zhang B and Fang M X. 2019. Effect of cosinusoidal phase-modulated scatter-wave jamming to the jamming suppression of SAR dual-channel cancellation. Journal of Remote Sensing, 23(1): 99–107 DOI： 10.11834/jrs.20197114.

摘要

作为多通道合成孔径雷达(SAR)的一种高效便捷的抗干扰方法，SAR多通道对消技术可有效抑制包括散射波干扰在内的多种干扰类型，于是提出采用方位向余弦调相散射波干扰方法来对抗SAR双通道对消的干扰抑制能力。该方法通过对传统散射波干扰慢时间域进行余弦调相，不仅实现了干扰信号的方位向扩展，更使得干扰信号到达各通道之间的相位关系发生严重改变。这种相位差变化会影响干扰对消过程中的自动相位搜索环节，扰乱对消时所需补偿相位的估计结果，进而严重破坏对消后的真实场景成像。以SAR双通道对消系统为例分析了该干扰方法的影响效果，理论分析与实验结果表明：余弦调相散射波干扰可使得补偿相位的估计结果在慢时间上近似正弦分布；在双通道对消成像中，该干扰使得真实场景在方位向上被重复搬移，造成严重的影像重叠，同时在方位向上伴随着密集的明暗条纹；干扰效果可通过设定余弦调制频率、调制指数等参数进行控制。

Abstract

The development and application of the multi-channel Synthetic Aperture Radar (SAR) have greatly enhanced the information acquisition and anti-jamming capabilities of the imaging radar and led to its development direction. Compared with the traditional SAR

the multi-channel SAR can extract more useful information from the phase of echo signals and has a higher degree of freedom. As one of several types of mature multi-channel techniques

SAR multi-channel cancellation technique can suppress various kinds of jamming signals

including scatter-wave jamming signals

by using the phase relation of jamming signals received by different channels

making it an efficient and direct type of anti-jamming method. In the process of multi-channel cancellation

the phase difference of jamming signals reaching different channels can be generally estimated by the automatic phase searching algorithm

and then the phase difference is used for compensation to finish the jamming signal cancellation. At present

regardless of the channels distributed along the track or across the track

multi-channel SAR systems can employ this anti-jamming technique. However

jamming technology against multi-channel cancellation has rarely been researched. Therefore

a cosinusoidal phase-modulated scatter-wave jamming method aimed at countering the multi-channel cancellation technique is proposed in this paper. First

multi-channel cancellation theory of traditional scatter-wave jamming is analyzed through the dual-channel cancellation technique

and the process of automatic phase searching algorithm based on the rule of minimum energy is summarized. Second

the cosinusoidal phase-modulated signal model is presented and used to improve the traditional scatter-wave jamming signal. Cosinusoidal phase modulation in slow time directly leads to the Doppler spectrum moving and the extension of jamming in the azimuth

according to which the imaging characteristic of the novel jamming signal for SAR is analyzed in detail. Then

the effect of the proposed jamming method working on the dual-channel cancellation system is derived and analyzed. Cosinusoidal phase modulation severely changes the original phase difference

which exerts an effect on the automatic phase searching link to alter the estimated results of the compensation phase in the cancellation process. The changed compensation phase will seriously destroy the real scene imaging. Finally

the simulation experiment results and analysis are presented in which four groups of jamming parameters are set and compared to verify the controllability of jamming. Theoretical analysis and experiment result show that the proposed jamming method can produce multiple false scattering scenes in traditional SAR imaging. In the dual-channel cancellation process

this method causes the estimated compensation phase to vary with slow time sinusoidally. It also causes the real scene image to move repeatedly

which leads to serious image overlapping and produces many dark and bright speckles distributed along the azimuth. The jamming effect can be controlled by setting different jamming parameters

such as modulation frequency and so on. The proposed jamming method is flexible

controllable

and has good stealthiness. It can deactivate the multi-channel cancellation jamming suppression and enhance the jamming effect by utilizing the characteristics of the cancellation process. Importantly

the jamming signal after phase modulation in the azimuth can influence the extraction result of phase information of the signal received by the multi-channel SAR system. Such effect can provide additional ideas and methods for multi-channel SAR jamming research.

关键词

合成孔径雷达双通道对消散射波干扰余弦调相补偿相位电子对抗

Keywords

synthetic aperture radar (SAR)dual-channel cancellationscatter-wave jammingcosinusoidal phase-modulatedcompensation phaseelectronic countermeasures (ECM)

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