基于子阵级处理的宽带非规则子阵相控阵鲁棒性干扰抑制

doi:10.12305/j.issn.1001-506X.2024.02.01

摘要/Abstract

摘要：

针对宽带非规则子阵相控阵在复杂干扰环境下性能变差的情况, 提出一种基于子阵级处理的鲁棒性干扰抑制方法。首先, 建立存在误差情况下的宽带阵列子阵级回波模型; 通过子阵级数字Stretch处理将宽带线性调频回波信号变为窄带信号, 降低处理的有效带宽; 然后, 进一步改进基于谱分离的干扰加噪声协方差矩阵重构方法, 利用测量的先验信息划分子区间, 减小重构区域, 降低运算量; 最后, 利用获得的最优权值加权各通道数据获得阵列输出。所提方法有效利用非规则子阵优势, 避免了规则子阵阵面方向图中存在栅瓣的情况, 能够在存在多种组合干扰和误差的情况下抑制干扰, 具有较强的鲁棒性。

关键词: 宽带, 子阵级处理, 鲁棒性, 干扰抑制

Abstract:

A robust interference suppression method based on subarray level processing is proposed for the poor performance of wideband irregular subarray phased arrays in complex interference environments. Firstly, the subarray level echo model of wideband array with errors is established. The wideband linear frequency modulation echo signal can be transformed into narrowband signal through the subarray digital Stretch processing and the effective bandwidth of processing can be reduced. Then, the method of interference and noise covariance matrix reconstruction based on spectral separation is further improved, and the measured prior information is used to divide the molecular interval to decrease the reconstruction area and reduce the amount of computation. Finally, the optimal weight is used to weight each channel data to obtain the array output. The proposed method makes good use of the advantages of irregular subarrays and avoids the presence of gate lobes in the pattern of regular subarrays. It can also suppress interference in the case of multiple combination interference and error, and has strong robustness.

Key words: wideband, subarray level processing, robustness, interference suppression

中图分类号:

TN958

陈吉源, 徐振海, 肖顺平. 基于子阵级处理的宽带非规则子阵相控阵鲁棒性干扰抑制[J]. 系统工程与电子技术, 2024, 46(2): 367-380.

Jiyuan CHEN, Zhenhai XU, Shunping XIAO. Robust interference suppression of wideband irregular subarrayed phased array based on subarray level processing[J]. Systems Engineering and Electronics, 2024, 46(2): 367-380.

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参数	取值	参数	取值
阵列规模	64×64	信号脉宽/μs	50
子阵大小	8单元	参考距离/km	50
LFM信号中心频率/GHz	10	目标相对参考位置的距离/m	10
信号带宽/GHz	1	SNR/dB	-5
距离窗/m	120	目标方位/(°)	(10, 10)

干扰	INR/dB	相对距离/m	来波方位/(°)
窄带干扰	40	-20	(-10, 10)
宽带噪声干扰	20	-10	(10, -5)

干扰	INR/dB	相对距离/m	来波方位/(°)
窄带干扰	40	-20	(-10, 10)
宽带干扰	20	-10	(10, -5)

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