摘要
针对阵列在低信噪比条件下信号检测概率低且方位估计性能下降的问题,提出一种基于组合子阵协方差矩阵的线列阵扩展方法。该方法将阵列划分为奇偶子阵,根据子阵的互协方差与自协方差矩阵构建扩展接收数据,对扩展接收数据进行组合作为最终的阵列接收数据进行处理,由此在突破阵列物理孔径的基础上避免仅使用奇偶阵元互协方差重构接收数据时产生的栅瓣问题。仿真结果表明:新方法可以降低波束输出的旁瓣,具有较好的弱目标检测能力和方位分辨力;相比于基于奇偶阵元互协方差的阵列扩展方法,新方法可有效提升方位估计精度,且不存在栅瓣问题。
A linear array extension method based on combination of sub-array covariance matrices is proposed to solve the problem of performance deterioration of signal detection and azimuth estimation under low signal-to-noise ratio.The proposed method divides the array into odd and even sub-arrays,and the extended received data is constructed by using the cross-covariance and auto-covariance matrices of the two sub-arrays.Finally,the final extended signal is obtained by combining the extended received data.The proposed method breaks through the physical aperture of array,and avoids the problem of grating lobe when using the cross-covariance of odd and even sub-arrays only to reconstruct the received data.Simulated results show that the proposed method can be used to reduce the sidelobe of beam output,and has good weak target detection ability and azimuth resolution.Compared with the array extension algorithm based on the cross covariance of odd and even sub-arrays,the proposed method can provide higher azimuth estimation accuracy.
作者
梁国龙
罗钧戈
郝宇
付进
LIANG Guolong;LUO Junge;HAO Yu;FU Jin(National Key Laboratory of Underwater Acoustic Technology,Harbin Engineering University,Harbin 150001,Heilongjiang,China;Key Laboratory of Marine Information Acquisition and Security of Ministry of Industry and Information Technology,Harbin Engineering University,Harbin 150001,Heilongjiang,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2024年第5期1717-1724,共8页
Acta Armamentarii
基金
国家自然科学基金项目(62101153)
水声技术重点实验室稳定支持课题(JCKYS2021604SSJS003)。
关键词
阵列扩展
弱目标检测
波达方向估计
栅瓣
协方差矩阵
array extension
weak target detection
direction-of-arrival estimation
grating lobe
covariance matrix
