对合成孔径雷达的移频干扰研究

从分析脉冲压缩信号时延和频移的耦合特性出发，推导了移频干扰对采用脉冲压缩信号体制的合成孔径雷达（SAR）的干扰输出形式，研究表明移频干扰的移频量与合成孔径雷达方位向处理的多普勒带宽无关，但只能形成点目标或线目标干扰。为此，提出了两种改进的移频干扰新样式——随机移频干扰和步进移频干扰。改进的移频干扰样式能够形成一个干扰区域，克服了固定移频干扰不能掩护分布目标的不足。理论分析和仿真表明，改进的移频干扰样式可掩护分布目标，由于可获得一维和二维信号处理增益，干扰效果优于噪声干扰。

A Study On the Shift-Frequency Jamming to SAR

The inherent coupling property between time-delay and frequency-shift of the pulse compression signal is analyzed.Then,the jamming output of SFJ to SAR,which works with pulse compression signal system,is deduced.Both theoretic analysis and simulation show that the frequency-shift of the SFJ has no touch with the Doppler bandwidth at azimuth compression of SAR and the imaging output of SFJ is point target or line target.To overcome the deficiency that the conventional SFJ can't cover distributed target,two improved SFJ styles to SAR are presented.Random-shift-frequency jamming and stepped-shift-frequency jamming whose imaging output through SAR are both jamming area.Theoretic analysis and simulation show that the improved SFJ styles can protect distribute target and have better jamming effects than noise jamming for getting one-dimension or two-dimensions SAR's processing gains.