多基地极化雷达主瓣干扰抑制算法 |
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引用本文: | 宁立跃,杨小鹏. 多基地极化雷达主瓣干扰抑制算法[J]. 信号处理, 2017, 33(12): 1571-1577. DOI: 10.16798/j.issn.1003-0530.2017.12.007 |
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作者姓名: | 宁立跃 杨小鹏 |
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作者单位: | 北京理工大学信息与电子学院雷达技术研究所 |
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基金项目: | 高等学校学科创新引智计划资助项目(B14010);国家自然科学基金资助项目(61671065,61427802)
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摘 要: | 现代战场电子对抗日益复杂,电磁干扰形式多样,当干扰从接收机主瓣进入会形成主瓣干扰。主瓣干扰严重影响雷达正常工作,传统空域、极化域、时频域等抗干扰算法都很难有效对其抑制。为有效抑制主瓣干扰,文章利用目标极化散射特性在不同角度存在差异的特点,提出基于多基雷达的空-极化协同滤波主瓣干扰抑制方法。方法首先采用主瓣保形技术在空域抑制副瓣干扰并压低空间噪声,然后将多基地雷达接收的数据进行时域对齐,计算包含主瓣干扰和回波信号的数据协方差矩阵,通过分解协方差矩阵在空-极化信号空间识别干扰,估计回波信号导向矢量,最后将目标回波与主瓣干扰通过多基地极化滤波,滤除主瓣干扰保留目标回波信号。通过仿真算法抑制噪声干扰与转发干扰,验证了所提算法能够有效对抗主瓣干扰,有效提高输出信干噪比。
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关 键 词: | 主瓣干扰抑制 极化敏感阵列 分布式雷达 多域滤波 |
收稿时间: | 2017-10-09 |
Multi-base polarization radar main-lobe interference suppression algorithm |
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Affiliation: | Radar Research Lab, School of Information and Electronics, Beijing Institute of Technology |
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Abstract: | Modern battlefield electromagnetic confrontation is increasingly complex, and there are many kinds of electromagnetic interference. The interference will form the main-lobe interference when it comes into the receiver main-lobe. Traditional anti-interference method in space polarization and time-frequency domain is hard to suppress the main-lobe interference. And the performance of radar is affected severely. Aimed at the problem of main-lobe interference suppression, space-polarization filtering method based on multi-base radar is developed. It takes advantage of the difference of target polarization scattering characteristics in different scattering angles. Firstly proposed method suppresses side-lobe interference and spatial noise in space domain using main-lobe shape preserving technique. Then calibrate time delay and calculate the covariance matrix of data including main-lobe jamming and echo signal. Then recognize main-lobe jamming in space-polarization signal space through the decomposition of covariance matrix, and estimate echo signal steering vector. Finally acquire target echo signal by multi-base space-polarization filtering. The main-lobe interference is filtered in echo signal subspace and echo is remained. Through simulation of suppressing noise and repeater interference, it proves that proposed method can suppress main-lobe interference effectively, and enhance output signal to interference and noise radio. |
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