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Intermittent Sampling Repeater Shading Jamming Method Based on Motion Modulation for SAR-GMTI
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摘要: 该文提出一种对SAR-GMTI的遮蔽干扰方法。该方法将截获的SAR信号进行间歇采样并对其运动调制后转发出去，利用运动调制效应在方位向上产生展宽和间歇采样转发在距离向上产生周期延拓的多假目标，二者结合形成灵巧遮蔽干扰效果，且干扰经多通道对消后无法被对消。此干扰独特之处在于能够将干扰能量仅出现在需要遮盖的运动目标上，从而更有效地利用了干扰能量。以三通道干涉对消为例着重分析了该方法对多通道GMTI的干扰原理。仿真实验证明了此干扰方法的正确性和有效性。
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关键词:
- 合成孔径雷达地面动目标显示 /
- 调制干扰 /
- 运动调制效应 /
- 间歇采样转发干扰
Abstract: In this paper, we present a shading jamming method for the Synthetic Aperture Radar and Ground Moving Target Indicator (SAR-GMTI). This method begins with intermittently sampling intercepted SAR signals, performing motion modulation, and then transmitting them. The motion modulation of SAR signals can produce a motion modulation effect and intermittent sampling repeater jamming can produce multi-fronted and lagged false targets along a range. Their combination provides a jamming effect of smart shading areas, which can’t be cancelled after multi-channel cancelling. The uniqueness of this jamming method is that the energy only appears on the moving target to be covered, so less jamming energy is needed. We analyzed the proposed jamming principle against GMTI using the tri-channel interference cancelling technique. Our simulation results verify our analyses and confirm its jamming effectiveness for SAR-GMTI. -
图 3 三通道SAR-GMTI干涉处理几何模型
Figure 3. The sketch map of tri-antenna interference cancelling technique
图 7 不同运动调制参数下的干扰图像
Figure 7. Jamming images with different motion modulation parameters
表 1 SAR-GMTI实验参数
Table 1. The simulation experiment parameters
SAR参数名称 数值 信号载频(GHz) 10 信号脉宽(μs) 20 距离向信号带宽(MHz) 100 方位向信号带宽(Hz) 400 各通道天线间距(m) 1 飞行高度(m) 6000 合成孔径长度(m) 300 载机速度(m/s) 200 脉冲重复周期(Hz) 480 通道数目 3 
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表 2 干扰实验参数
Table 2. The jamming experiment parameters
干扰参数名称 符号 采样周期(μs) Ts 距离向调制速度(m/s) vy 距离向调制加速度(m/s2) ay 占空比 Dr 方位向调制速度(m/s) vx 方位向调制加速度(m/s2) ax
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