| 摘要: |
| 间歇采样转发干扰凭借其脉内快速采样转发的优势，形成的干扰信号与目标强相关，因此可获得脉冲压缩处理增益并形成假目标群，对雷达目标探测带来严峻考验。本文以提升雷达主动对抗能力为目标，提出了一种基于时频重叠度的脉内捷变波形设计与干扰对抗算法。首先，构建关于干扰与目标时频重叠度的目标函数，通过优化子脉冲个数以及脉内编码序列，增加干扰与目标的时频正交性。基于优化后的脉内捷变波形，通过边缘检测算法识别干扰区域并构造时频滤波器，实现时频域的干扰识别与抑制。实验结果表明，所提算法在单个及多个间歇采样转发干扰场景下均表现出良好的干扰对抗性能，有效提升了雷达的干扰对抗能力。 |
| 关键词: 间歇采样转发干扰 脉内捷变波形 时频重叠 干扰抑制 |
| DOI： |
| 分类号:TN974 |
| 基金项目:基金项目：国家自然科学基金（62331019） |
|
| Design of Intra-pulse Frequency Agile Waveform and Interference Countermeasures Based on the Time-Frequency Overlap Degree |
|
|
|
|
| Abstract: |
| Interrupted sampling repeater jamming, with its advantage of rapid intra-pulse sampling and forwarding, forms jamming signals that are strongly correlated with the target. Consequently, it can obtain pulse compression processing gain and form false target groups, posing a severe test to radar target detection. Aiming to improve the active countermeasure capability of radar, an intra-pulse frequency agile waveform design and jamming countermeasure algorithm based on minimizing the time-frequency overlap area is proposed. Firstly, the objective function regarding the time-frequency overlap area between jamming and the target is constructed. By optimizing the number of sub-pulses and the intra-pulse coding sequence, the time-frequency orthogonality between jamming and the target is increased. Based on the optimized intra-pulse frequency agile waveform, the interference area is identified by an edge detection algorithm and a time-frequency filter is constructed to realize interference identification and suppression in the time-frequency domain. Experimental results show that the proposed algorithm exhibits good jamming countermeasure performance in single and multiple intermittent sampling and repeater jamming scenarios, effectively improving the jamming countermeasure capability of radar. |
| Key words: Interrupted sampling repeater jamming (ISRJ) Intra-pulse frequency agile waveform Time-frequency overlap Interference suppression |