摘要
针对阵元位置失配时反卷积常规波束形成方法会在旁瓣位置产生能量较高的伪信号特征的问题,提出了一种联合通道随机关闭和反卷积的水平阵波达方位估计方法,计算不同方向的加权向量时在阵列孔径不变的前提下随机关闭一定数目的阵元。该方法能保持点传播函数字典矩阵在对角线附近的结构不变,在矩阵其他区域引入噪声,从而抑制伪信号特征的产生。仿真实验证实,在可工作范围内,该方法相比于反卷积常规波束形成能大幅抑制背景能量,显著提高目标信号峰值背景对比度。此外,利用SWellEx96实验数据进一步验证了该方法抑制背景能量和实现目标信号检测的优良性能。
The deconvolved conventional beamforming(dCv)algorithm produces high-energy pseudo-signal characteristics in sidelobe positions when there is a mismatch at the element position.To address this issue,a direction of arrival estimation method jointing channel randomly shielding and deconvolution(RS-DBF)algorithm is proposed.When calculating the weighted vectors in different directions,this method randomly shields a certain number of elements while keeping the array aperture unchanged.This method can maintain the structure of the point spread function dictionary matrix near the diagonal and introduce noise in other areas of the matrix to suppress the generation of pseudo-signal characteristics.Simulations have shown that within the working range,RSDBF can significantly suppress background energy and improve the peak-to-background contrast of target signals compared to dCv.In addition,the excellent performance of RS-DBF in suppressing background energy and achieving target signal detection is further verified by using SWellEx96 experimental data.
作者
屈嵩岳
郭良浩
董阁
QU Songyue;GUO Lianghao;DONG Ge(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)
出处
《声学学报》
EI
CAS
CSCD
北大核心
2024年第1期1-15,共15页
Acta Acustica
基金
国防科技创新特区项目、国家自然科学基金项目(11874061,12174418,12174419)
国家重点研发计划(2018YFC0308600)资助。
关键词
波达方位估计
反卷积
波束形成
阵元位置误差
Direction of arrival estimation
Deconvolution
Beamforming
Array position error
