| 摘要: |
| 频谱弥散(Smeared Spectrum,SMSP)干扰是一种针对脉冲压缩雷达的密集假目标干扰，兼具压制和欺骗干扰效果。为了有效抑制SMSP干扰，根据SMSP干扰参数与雷达发射信号参数的关系，提出了基于干扰重构对消和分数阶滤波的干扰抑制方法。首先利用分数阶傅里叶变换对SMSP干扰调频率进行精估计得到SMSP干扰子脉冲个数和脉宽,然后构造特殊匹配滤波器估计SMSP干扰的时延，接着采用匹配傅里叶变换估计SMSP干扰的幅度和初始相位，最后在参数估计的基础上重构SMSP干扰并对消。仿真结果表明，干扰重构对消达到29 dB以上信干比增益，在此基础上分数阶滤波能进一步提高信干噪比增益 |
| 关键词: 密集假目标干扰 频谱弥散干扰 干扰重构 分数阶滤波 |
| DOI： |
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| 基金项目: |
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| Smeared spectrum jamming suppression based on jamming reconstruction and fractional filtering |
| YU Kanglin,KUANG Huaxing,WANG Chaoyu |
| (No.724 Research Institute of China State Shipbuilding Corporation,Nanjing 211153,China) |
| Abstract: |
| Smeared spectrum(SMSP) jamming is a kind of dense false targets jamming to pulse compression radar,and it owns both suppression and deception effect.In order to suppress SMSP jamming,a jamming suppression method is proposed based on jamming reconstruction and fractional filtering according to the parameters relationship between SMSP jamming and radar transmission signal.Firstly,the fractional Fourier transform is used to estimate the chirp rate of SMSP jamming, and obtain the number and width of sub-pulse.Next,the delay of SMSP jamming is estimated by constructing special matched filter.Then,the matched Fourier transform is used to estimate the amplitude and initial phase.Finally,SMSP jamming is reconstructed and suppressed.Simulation result shows that,
the signal-to-jamming ratio gain is more than 29 dB after jamming reconstruction and cancellation,and the signal-to-jamming plus noise ratio can be further improved after fractional filtering. |
| Key words: dense false target jamming smeared spectrum(SMSP) jamming jamming reconstruction fractional filtering |
