对逆合成孔径雷达的移频干扰技术研究

Study on the Shift-Frequency Jamming to ISAR

文章在分析脉冲压缩信号时延和频移的耦合特性以及逆合成孔径雷达（ISAR，Inverse Synthetic Aperture Radar）成像原理的基础上，分析了固定移频干扰对ISAR的干扰效果。针对固定移频干扰只能形成点目标或线目标干扰的局限，研究了一种改进的移频干扰样式——随机移频干扰。理论分析表明随机移频干扰能有效地破坏目标的一维距离像，进而实现对ISAR二维成像的有效干扰。仿真结果表明随机移频干扰能够获得一定的信号处理增益，干扰效果优于噪声干扰，是一种有效的干扰样式。

The inherent coupling property between time-delay and frequency-shift of the pulse compression signal and the principle of Inverse Synthetic Aperture Radar （ISAR） are introduced in this paper. On the basis of it, the jamming effects of the conventional Shift-Frequency Jamming （SFJ） to ISAR are analyzed. For its jamming limitation of the fake point target or line target imaging output, an improved SFJ style, Randomly Shift-Frequency Jamming Style is put forward. The analysis on principle shows that this jamming can jam 1 - D range profile and 2 - D image of the target remarkably. The simulation shows that the improved SFJ styles have better jamming effects than noise jamming for getting processing gains. So it is an effective jamming means.