【作者】 朱燕；

【导师】 赵国庆；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2005， 硕士

【摘要】 相参雷达的出现使得传统干扰能力下降，因此干扰也转向相关性方面的研究。本文讨论了PD，SAR等相参雷达信号处理过程，该过程能有效屏蔽掉与回波信号相位无关的干扰信号，通过仿真该过程，产生目标的一维，二维图像；然后建立非相干性干扰和相干性干扰的理论模型，其中采用非相干噪声调制的干扰属于非相干干扰，而相干性干扰包括用移频移相产生的压制性干扰和采用DRFM，延迟等幅相调制技术产生的压制性或欺骗性干扰，分别对它们进行仿真、比较，并分析其干扰效果。由于噪声干扰与雷达回波信号相位相参性很小，并且雷达信号处理过程又采用距离，方位向的匹配滤波，相参积累等处理方法，所以干扰能量较分散；而相干脉冲串形成的压制性干扰和假目标干扰等欺骗干扰是在雷达发射信号的基础上进行调制，其功率谱也有类似雷达回波所具有的聚敛性的特点，从而产生较好的干扰效果。最后总结常用的干扰评估方法，并定量的分析一下SAR的干扰效果，提出几条有效的干扰评估准则。更多还原

【Abstract】 The appearance of correlative radars makes the jamming ability of traditional jamming techniques worse. So the direction of jamming study has been changed and turns to the correlative study. Firstly the signal processing is discussed in correlative radars such as PD radar and SAR. They can restrain jamming signals and clutters which are irrelative with the radar echoes. By the simulation targets’ images can be got. Then the irrelative jamming and the correlative jamming models are built up. The noise-modulated jamming belongs to irrelative jamming while correlative jamming includes suppressive jamming produced by frequency-shift, phrase-shift and fraudulent jamming produced by time-shift and DRFM. These jamming techniques are simulated .compared and the analysis of their jamming effects is made. As the result of the processing of matching filtering in range and cross-range and the less relationship between noise jamming signals and echoes the energy of jamming is dispersed. But correlate jamming is to modulate the radar’s transmitting signals and can make good use of the jamming energy. At last it is summarized that the ways to evaluate jamming are often used and a few evaluating rules aiming at SAR are put forward.更多还原