| 摘要: |
| 针对宽带相控阵雷达中具体需要多少自由度来抑制宽带干扰信号这一问题，提出了宽带干扰秩估计的量化表达式。首先讨论了单宽带干扰频率与角度之间存在的等效转换机制，推导出单宽带干扰的干扰秩估计表达式，单宽带干扰秩与阵元数、带宽载频比以及干扰角度有关。两个宽带干扰的秩根据其等效宽带干扰区间是否重叠，得到不同干扰秩表达式，多个干扰可利用两个宽带干扰秩估计的思想进一步推广得到。然后研究了宽带干扰秩与空时自由度之间的关系对抗干扰性能的影响，可将其应用到宽带空时自适应干扰抑制的子阵数和抽头延迟线阶数的设计之中。最后仿真实验验证了干扰秩估计表达式的准确性。 |
| 关键词: 宽带相控阵雷达 秩估计 空时自适应干扰抑制 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.02.007 |
| 分类号:TN958.92 |
| 基金项目:国家自然科学基金（No.61771095，61401062） |
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| Wideband Jammer Rank Estimation and Jammer Rejection of Phased Array Radar |
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AN Ruixue，WANG Xiaolin，CHEN Shuwen，ZHANG Wei
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1.School of Information and Communication Engineering，University of Electronic Science and Technology of China，Chengdu 611731，China;2.Beijing Institute of Control and Electronic Technology，Beijing 100038，China;3. AVIC Leihua Electronic Technology Research Institute，Wuxi 214063，China
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| Abstract: |
| For the problem of how many degrees of freedom are needed to suppress wideband interference signals in wideband phased array radar，a method of wideband jammer rank estimation is proposed．Firstly，the 〖KG-*4〗equivalent transformation between the frequency and the angle in wideband interference signal is discussed and the wideband jammer rank estimation expression of single broadband interference is derived. The rank of wideband interference depends on the interference angle，bandwidth to frequency ratio and the number of the array．Based on whether two wideband equivalent interference angles will overlap，the rank estimation can be expressed by different expressions．Then the influence of the relationship between the broadband interference rank and the space time degree of freedom on the anti jamming performance is studied，which can be applied to design subarray division numbers and tapped delay line orders for space time adaptive interference rejection. Finally，the simulation results prove the accuracy of the wideband jammer rank estimation expression. |
| Key words: wideband phased array radar rank estimation space time adaptive interference rejection |
