| 摘要: |
| 当干扰从雷达的主瓣方向进入时，传统的自适应旁瓣相消算法会导致波束变形、主瓣指向偏移等问题。为了克服传统抗干扰方法遇到的问题，提出了基于相位编码的抗干扰方法，根据发射信号的特性设计出匹配滤波和阻塞滤波器，将接收到的回波信号分别通过两滤波器得到两路信号，然后利用旁瓣对消算法将辅路的干扰滤除。这种方法会导致目标所在多普勒单元的距离旁瓣升高，为了进一步降低目标信号所在多普勒单元的距离旁瓣，提出了将目标所在距离 多普勒频率单元去除后，再进行旁瓣对消的方法。通过仿真表明，本文提出的算法能有效抑制从主瓣进入的干扰，且目标所在的多普勒单元的距离旁瓣有所降低。 |
| 关键词: 抗干扰 相位编码 匹配滤波 阻塞滤波 自适应对消 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.01.014 |
| 分类号:TN974 |
| 基金项目: |
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| A Mainlobe Interference Countering Method Based on Blocking Filter |
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HU Haitao，ZHANG Jianyun
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Electronic Countermeasures Information Processing Military Key Laboratory，Electronic Countermeasures Institute,National University of Defense Technology，Hefei 230037,China
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| Abstract: |
| When the interference enters from the mainlobe direction of the radar，the adaptive sidelobe cancellation algorithm will lead to beam distortion and mainlobe pointing offset. In order to overcome the problems encountered in traditional anti jamming methods，this paper proposes an anti interference method based on phase coding. According to the characteristics of the transmitted signal，a matching filter and a blocking filter are designed. The received echo signals are sent to the two filters to get two signals respectively，and then use the sidelobe cancellation algorithm to filter out the interference in the auxiliary channel. This method will lead to the rise of the range sidelobe of the Doppler cell where the target locates. In order to further reduce the range sidelobe，a method is proposed that the sidelobe cancellation is carried out after removing range Doppler cell where the target locates. The interference from the mainlobe can be effectively suppressed and the range sidelobes are reduced，which verifies the effectiveness of the proposed algorithm. |
| Key words: anti jamming phase encoding matched filtering blocking filtering adaptive cancellation |
