【作者】 王茹；

【导师】 赵国庆；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2006， 硕士

【摘要】 传统雷达的信号带宽较小,距离分辨力较低,以至于将具有一定尺寸的目标都视作点目标。随着雷达信号带宽的增加,其距离分辨力也得到了极大的改善,尤其是新体制雷达的出现,通过发射大时宽带宽积信号,利用脉冲压缩技术,大大地提高了距离分辨力。由于新体制雷达的不断发展,其抗干扰能力也不断的加强,必然对雷达干扰技术提出了新的要求。本文首先介绍了常见的几种高分辨率雷达信号及其处理技术和雷达目标模型,在此基础上分析了高分辨率雷达的一维距离像的特点;其次对延时欺骗干扰、移频欺骗干扰和假目标干扰分别进行了原理分析和仿真实验,由于假目标干扰像具有类似于高分辨率雷达目标距离像的特点,因而本文重点研究了脉内假目标的干扰原理和实现技术,通过仿真,发现脉内假目标干扰的确能够有效干扰高分辨率雷达,达到很好的干扰效果。由于假目标的叠加会引起D/A量化位数的溢出,因而本文还通过具体的仿真实验,研究了量化和限幅对假目标干扰像的影响;最后总结常用的干扰度量和评估方法,提出了针对SAR的图像干扰评估指标。更多还原

【Abstract】 Since the signal bandwidth of tradition radar is narrow and the range resolution is also lower, many targets which has certain size are regarded as one point targets. With the bandwidth of radar increasing, the range resolution is improved. Especially radar of the new system appearing, it enhances the range resolution by transmitting the signal, which possesses large product of time width and bandwidth, and using the technology of pulse compression. Because the new system radar is continuous development, anti-jamming is also strength, which is put forward new request to radar jamming.Firstly, the thesis introduces the signals of high resolution radar (HRR) , the technology of signal processing and the target-model of radar;on the basis of it, the one dimension range profile of HRR is analyzed. Secondly, the theories of range deceptive jamming, shift frequency deceptive jamming and false target jamming are analyzed and simulated. Since the false target jamming profile has the same characteristic to the range profile of HRR, this thesis mainly studies the false target jamming theory and realization technology. Through simulation experiment, it is found that the false targets jamming surely and availably can be used to HRR jamming. Since the false target jamming will cause D/A converter overflowing, the thesis also studies the influence to false target jamming profile by D/A quantizing and amplitude limiting. Finally, it is summarized that the ways to measure and evaluate jamming are often used and a few evaluating rules aiming at SAR are put forward.更多还原