【作者】 李海强；

【导师】 姜卫东；

【作者基本信息】 国防科学技术大学 ， 信息与通信工程， 2011， 硕士

【摘要】 目前逆合成孔径雷达(ISAR)成像在军事中的应用日显突出,它是目标分类与识别、精确制导等方面重要的手段,在未来防空和导弹防御领域中具有十分重要的作用。针对逆合成孔径雷达的干扰也成为电子对抗领域的一个热点问题。本文研究了基于数字图像合成的ISAR欺骗性干扰,设计了基于该方法的硬件处理系统。并在该系统平台上完成了DSP、FPGA软件。本文研究工作主要有:分析了ISAR成像原理及算法流程,对目前ISAR的各种干扰方式进行了比较研究。论文首先介绍了几种噪声干扰方法,然后重点分析了基于数字图像合成(DIS)的ISAR欺骗性干扰技术,并给出了假目标ISAR成像的计算机仿真结果。详细研究了基于DIS的ISAR干扰机结构和特点,分析了各系统参数的量化位数,选取合适的硬件处理器完成相应运算,对各部分计算进行硬件编程实现。提出了一种实时ISAR欺骗性干扰系统结构,设计并完成了ISAR成像欺骗性干扰的高速信号处理系统。该处理系统采用DSP+FPGA的结构,目标特性调制信息的生成主要由DSP完成,FPGA实现干扰目标特性信息在雷达信号上的调制,从而协同进行ISAR欺骗性干扰。本系统具有较强的计算和数据通信能力以及灵活的并行算法处理架构。实验结果证明本系统可以实现对宽带雷达的实时ISAR欺骗性干扰。更多还原

【Abstract】 At present, Inverse Synthetic Aperture Radar (ISAR) imaging capability plays an important role in military applications, such as target classification, recognition and accurate weapon navigation. Jamming for ISAR is a hot topic in the field of electronic countermeasures. This paper focus on the method of deception jamming based on digital image synthesis (DIS). In allusion to the practicality method, the hardware system is designed. Deception jamming based on DIS is realized on the platform. The main works researched in this paper are as follows:The basic principle of ISAR imaging and the processing flow of imaging algorithms are analyzed. Firstly, several methods of noise jamming are analyzed. Then, deception jamming based on DIS is analyzed and the simulation result of the false target image is given.The structure and characteristics of ISAR jammer based on DIS are described in detail, and then the resolutions of system parameters are analyzed. In allusion to the characteristics of the method, we adopt processors which are fixable to the method and realize the method on the emulation mode of the hardware.A real-time ISAR deception jamming system is proposed; the high-speed signal processing board are designed and implemented. The system adopts the structure of DSP+FPGA, in which DSP generates the modulation parameters of target characteristic and FPGA modulate the radar echo based on modulation parameters. The system is powerful on computing and data communication along with the convenient parallel arithmetic processing structure. Experimental results show that the system can achieve real-time ISAR deception jamming.更多还原