【作者】 李晨；

【导师】 朱兆达；

【作者基本信息】 南京航空航天大学 ， 通信与信息系统， 2005， 硕士

【摘要】 合成孔径雷达是一种高分辨率的成像雷达,被广泛应用于各遥感领域。在军事遥感领域,在对早期战略的获取和战场情况的侦察方面,合成孔径雷达表现出强大的威力。因此,开展对合成孔径雷达干扰技术的研究是十分必要的。本文主要研究了两种对合成孔径雷达的有源欺骗干扰-虚假图像干扰和弹射式干扰。本文第一章为绪论,简单介绍了合成孔径雷达干扰的分类及研究现状,并概述全文内容。第二章研究了合成孔径雷达回波信号,建立了静止目标和运动目标的回波模型。第三章对虚假图像干扰进行了研究,通过对雷达波束内两个不同的点目标在同一时刻的回波信号进行的分析比较,推导了干扰信号的生成公式,对干扰信号的特征作了详细的分析,并结合实测数据做了仿真实验。第四章将动目标检测技术和空域对消技术引入到对干扰目标的检测中,提出了沿航迹和跨航迹双天线干涉对消检测虚假图像欺骗干扰的方法。文中分别对这两种检测方法的适用性作了具体的阐述,并在点目标的仿真实验中得到了验证。第五章介绍了弹射式干扰原理,对干扰信号特征及干扰效果作了具体的分析,并利用机载SAR参数作了干扰仿真实验;根据弹射式干扰信号多普勒频率的特点,利用沿航迹双天线干涉对消技术对弹射式点目标干扰进行检测,分析了仿真结果;最后还将弹射式干扰与虚假图像干扰进行了比较。第六章对全文工作进行总结,指出有待进一步研究的问题。更多还原

【Abstract】 As a kind of high resolution imaging radar, synthetic aperture radar (SAR) has been widely used in many remote sensing fields. In military application, SAR is of great value in obtaining forepart stratagems and battlefield conditions. So it is terribly essential to study the methods of jamming to SAR. In this thesis, two methods of active deception jamming to SAR, false target jamming and rebound jamming, are mainly studied.In the preface to the article, the catalog and the present situation of SAR jamming are introduced. The contents of this paper are outlined.Chapter 2 deals with the ground echo signal of SAR, and establishes the signal models of static target and moving target.Chapter 3 studies the false target jamming. Jamming signal generation formula is proposed by the investigation of simultaneous ground echoes of two different point targets in radar beam. Comprehensive research about the characteristics of jamming signal is made, and raw data is used in simulation.Chapter 4 proposes two false target jamming detection schemes by dual-aperture antenna along-track and cross-track interferometric SAR, which are based on moving target detection technique and spatial cancellation algorithm. Each kind of schemes is discussed with its applicability in details and validated by point target simulation.Chapter 5 treats rebound jamming with its basic principle .Characteristics of jamming signal and jamming effect are analyzed. Space-borne radar parameters are used in simulation. Base on the doppler frequency of rebound jamming signal, along-track interferometric detection scheme, which is proposed in chapter 4, is employed to detect point target rebound jamming in simulation, and the results validate the feasibility of this kind detection scheme. At last, a detailed comparison between rebound jamming and false target jamming is made.Chapter 6 summarizes the whole work of this thesis and points out the problems to be solved in the future.更多还原