基于双平行互质极化敏感阵列的二维非网格DOA及极化参数估计  

Two-Dimensional Off-Grid DOA and Polarization Parameter Estimation for Parallel Coprime Polarization Sensitive Array

作　　者：曾富红 彭占立 司伟建[2] 王庭佳 孙铭国 Zeng Fuhong;Peng Zhanli;Si Weijian;Wang Tingjia;Sun Mingguo(Nanjing Coradar Electronic Equipment Co.,Ltd,Nanjing 211100,China;College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]南京科瑞达电子装备有限责任公司,南京211100 [2]哈尔滨工程大学信息与通信工程学院,哈尔滨150001

出　　处：《航空兵器》2023年第3期129-135,共7页Aero Weaponry

基　　金：国防科技173计划技术领域基金项目(2022-173ZD-010);航空科学基金项目(2019010P6001,2019010P6002)。

摘　　要：针对空间电磁信号的二维空间角及极化参数估计问题,提出一种基于双平行互质极化敏感阵列的二维非网格DOA及极化参数估计算法。该算法应用双平行互质极化敏感阵列接收信号,并根据接收数据特点构造了新型互协方差矩阵,再通过对该互协方差矩阵进行虚拟域扩展等方式实现了四维参数估计问题向四个一维参数估计问题的转化,在有效降低算法计算复杂度的同时,实现了参数的欠定估计。此外,为了进一步提高参数估计精度,本文算法引入了非网格模型,通过应用信号子空间与噪声子空间的正交性估计出网格偏差,降低了预设网格带来的固有偏差,实现了参数估计性能的提升。仿真实验表明了本文算法的有效性以及相对于网格算法具有更为优良的参数估计性能。For the two-dimensional(2-D)spatial angle and polarization parameter estimation problem of spatial electromagnetic signals,a 2-D off-grid DOA and polarization parameter estimation algorithm based on dual parallel coprime polarization sensitive array(PCPSA)is proposed.The algorithm applies a PCPSA to receive signals,constructs a novel cross-covariance matrix according to the characteristics of the received data,and then transforms the four-dimensional parameter estimation to four one-dimensional parameter estimation by extending the virtual domain of this cross-covariance matrix,which effectively reduces the computational complexity while achieving underdetermined parameter estimation.In addition,in order to further improve the parameter estimation accuracy,the proposed algorithm introduces a off-grid model and estimates the grid bias by applying the orthogonality of the signal subspace and the noise subspace,which reduces the inherent bias brought by the preset grids and achieves the improvement of parameter estimation performance.The simulation experiments show the effectiveness of the algorithm and the better parameter estimation performance compared with the on-grid algorithm.

关 键 词：互质极化敏感阵列 二维非网格DOA估计 极化参数估计 虚拟域扩展 网格偏差估计 

分 类 号：TJ765[兵器科学与技术—武器系统与运用工程] TN911.7[电子电信—通信与信息系统]