A Two-dimensional Mixed Baseline Method Based on MIMO-SAR for Countering Deceptive Jamming
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摘要: 针对距离延时和方位多普勒频率调制两类合成孔径雷达(SAR)欺骗干扰问题,该文提出一种基于多输入多输出合成孔径雷达(MIMO-SAR)的2维混合基线抗欺骗干扰方法。该方法采用基于MIMO-SAR的相位编码方案,使得多通道信号正交,利用多维相位信息识别欺骗干扰,通过相位补偿抑制干扰目标,从而提升雷达抗欺骗干扰能力。该文采用雷达抗干扰改善因子进行定量效果评估,在平台空间受限的条件下,该文方法比传统单发多收系统的雷达抗干扰改善因子提升3倍。仿真实验结果证明了该方法的有效性与正确性。
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关键词:
- 抗欺骗干扰 /
- 多输入多输出合成孔径雷达 /
- 相位补偿 /
- 雷达抗干扰改善因子
Abstract: A novel approach using two-dimensional mixed baseline based on Multi-Input Multi-Output Synthetic Aperture Radar (MIMO-SAR) has been proposed for range delay and azimuth Doppler frequency modulation used in deceptive jamming. Based on MIMO-SAR phase coding method, which makes the multi-channel signal orthogonal, we propose the detection of deceptive jamming phenomenon by employing multi-dimensional phase information, and suppress the jamming targets via phase compensation to improve the ability of countering deceptive jamming. Moreover, we utilize radar anti-jamming improvement factor as a quantitative evaluating index. In the limited platform space, the radar anti-jamming improvement factor of the proposed method is three times greater than that of conventional single-input multi-output systems. Experimental results demonstrate the validity of our method. -
表 1 仿真参数
Table 1. Simulation parameters
参数 数值 景中心斜距(km) 1.414 雷达有效速度(m/s) 150 发射脉冲时宽(μs) 2.5 距离调频率(Hz/s) 20 × 1012 雷达工作频率(GHz) 5.3 多普勒带宽(Hz) 80 距离采样率(MHz) 60 方位采样率(Hz) 400 回波信噪比(dB) 10 距离基线长度(m) 4 方位基线长度(m) 2 表 2 9点目标交轨干涉相位
Table 2. Cross-track interference phase of nine-point target
相位(rad) 第1列 第2列 第3列 第1行 0.1348 0.1370 0.1423 第2行 0.1360 0.1390 0.1407 第3行 0.1379 0.1370 0.1425 表 3 9点目标顺轨干涉相位
Table 3. Along-track interference phase of nine-point target
相位(rad) 第1列 第2列 第3列 第1行 3.085 3.085 3.085 第2行 0 0 0 第3行 –3.085 –3.086 –3.086 -
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