基于子空间空间谱极值起伏特性加权的未知目标检测方法

陈建军1,郑恩明2,陈新华2

振动与冲击 ›› 2018, Vol. 37 ›› Issue (18) : 209-215.

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PDF(1792 KB)
振动与冲击 ›› 2018, Vol. 37 ›› Issue (18) : 209-215.
论文

基于子空间空间谱极值起伏特性加权的未知目标检测方法

  • 陈建军1,郑恩明2,陈新华2
作者信息 +

Detection method for unknown targets based on the extremum fluctuation feature of subspace spatial spectrums

  • CHEN Jianjun1 ,ZHENG Enming2, CHEN Xinhua2
Author information +
文章历史 +

摘要

针对同一频带中不等强度未知目标检测问题,依据不同目标辐射信号对各子空间空间谱贡献大小的不同,提出一种基于子空间空间谱极值起伏特性加权的未知目标检测方法。对线列阵接收信号协方差矩阵进行特征分解得到各子空间相应子矩阵;对各子矩阵进行波束形成得到各子空间空间谱,并利用各子空间空间谱极值起伏差异形成加权因子;利用该加权因子对归一化的各子空间空间谱进行加权统计得到最终空间谱,以提升弱目标子空间空间谱在最终空间谱的比例。理论分析、数值仿真和实测数据处理结果均证明了,该方法可以有效抑制了噪声子空间对目标子空间的干扰,增强了弱目标子空间空间谱在最终空间谱的比例,使其比例由原先的σ2_s,w/(σ2_s,all+σ2_n/N变为1/L(N为阵元数,L为目标数,σ2_s,w为弱目标能量,σ2_s,all为目标信号能量和,σ2_n背景噪声能量);减小了不同强度目标子空间空间谱幅值差异,使强、弱目标空间谱幅度值比由原先的σ2_s,s/σ2_s,w近似变为1(σ2_s,s为强目标能量),改善了常规波束形成和常规子空间重构法对同一频带中不等强度未知目标的检测性能,并在同一波束图中,同时对不等强度未知目标实现有效检测。

Abstract

Under the same frequency unit, according to the different contribution of  different target radiated signals to each subspace, a weighted detection method based on the extremum fluctuation feature of subspace spatial spectrums was proposed for the sake of  detecting unknown unequal strength targets.In the method, an eigen decomposition was made on the covariance matrix of received data of a linear array to get the sub-covariance matrix of each subspace.The spatial spectrums were obtained by performing the beam-forming on each submatrix, and the extremum fluctuation differences between subspace spatial spectrums were atilized to determine the weight values.Then, with the weight values, the normalized spatial spectrum of each subspace was processed statistically and thus to form the final spatial spectrums, in which the proportion of the weak target subspace was increased.The theoretical analysis, numerical simulation and experimental results show that, the method can further restrain the spatial spectrum disturbances by noise subspaces, enhance the proportion of weak target subspace in the spatial spectrum, make the proportion increase from σ2_s,w/(σ2_s,all+σ2_n/N) to nearly 1/L, where N is the number of array elements, L is the number of targets, σ2_s,w is the energy of weak target, σ2_s,all is the energy of all the targets, σ2_n is the energy of background noise, decrease the spatial spectrum difference between different target subspaces from σ2_s,s/σ2_s,w to nearly 1, where σ2_s,s is the energy of strong target, improve the detection performance of conventional beam-forming for unknown unequal strength targets under the same frequency unit, and effectively detect unknown unequal strength targets in the same beam diagram.

关键词

目标检测 / 同一频带 / 特征分解 / 子空间 / 极值起伏特性

Key words

 Target detection / Same frequency unit / Eigen decomposition / Subspace / Extremum fluctuation feature

引用本文

导出引用
陈建军1,郑恩明2,陈新华2. 基于子空间空间谱极值起伏特性加权的未知目标检测方法[J]. 振动与冲击, 2018, 37(18): 209-215
CHEN Jianjun1,ZHENG Enming2, CHEN Xinhua2. Detection method for unknown targets based on the extremum fluctuation feature of subspace spatial spectrums[J]. Journal of Vibration and Shock, 2018, 37(18): 209-215

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