摘要
方位估计技术用于获得空间中的目标方位,阵列自由度表征阵列最多可分辨的目标个数,增加阵列自由度是方位估计的关键技术。稀疏阵的差分阵列可以实现利用较少的阵元个数,分辨更多的目标个数。但是为了降低稀疏阵的方位估计技术的难度,只选取稀疏阵差分阵列中最大连续的均匀直线阵进行方位估计,造成了阵元信息的浪费,且经常无法有效提高阵列自由度。为了进一步提高自由度,本文提出一种阵列流形向量映射的虚拟稀疏阵方位估计方法,利用虚拟阵列技术,在实际稀疏阵中增加虚拟阵元,使得虚拟稀疏阵差分阵列的最大连续均匀直线阵具有更多阵元,从而增加阵列自由度,理论分析与仿真结果证明了该方法的有效性。
Direction of arrival estimation technique is used to obtain target azimuth in space.The array degree of freedom characterizes the maximum number of targets that can be distinguished by the array,and increasing the degree of freedom is a key technology for direction of arrival estimation.The differential array of sparse arrays can utilize fewer array elements to distinguish more targets.However,in order to reduce the difficulty of direction of arrival estimation method for sparse arrays,scholars only select the largest continuous uniform linear array included in the differential array to estimate the target direction,which results in the incomplete utilization of element information and often cannot effectively improve the degree of freedom.In order to further improve the degree of freedom,this paper proposes a virtual sparse array direction of arrival estimation method based on array steering vector mapping.This method uses the virtual array technology to add virtual elements to the original sparse array,so that the maximum continuous uniform linear array of the virtual sparse array has more elements,so the degree of freedom is increased.Theoretical analysis and simulation results prove the effectiveness of the proposed method.
作者
王振波
井中武
张昊楠
刘恺忻
WANG Zhenbo;JING Zhongwu;ZHANG Haonan;LIU Kaixin(Geophysical Exploration Division of China Oilfield Service Co.,LTD,Tianjin 300450,China;Geophysical Equipment Development and Technology Sub center of National Engineering Research Center for Marine Oil and Gas Exploration,Tianjin 300450,China;Harbin Engineering University,College of Underwater Acoustic Engineering,Harbin 150001,China)
出处
《应用科技》
CAS
2024年第5期47-52,共6页
Applied Science and Technology
基金
中国海洋石油集团有限公司重大专项项目(E-23222T14)。
关键词
稀疏阵
阵列自由度
虚拟阵列
阵列流形向量映射
阵列信号处理
波达方向估计
内插变换方法
目标测向
sparse array
array degree of freedom
virtual array
array steering vector mapping
array signal processing
direction of arrival estimation
interpolation transformation method
target direction finding
