樊养余,
杜瑞,
吕国云
西北工业大学电子信息学院 ??西安 ??710129
基金项目:水声对抗重点实验室基金(kmb5494)
详细信息
作者简介:王剑书：男，1989年生，博士生，研究方向为阵列信号处理、DOA估计和波束形成等
樊养余：男，1960年生，教授，主要研究方向为数字图像处理、数字信号处理理论与应用、无线光通信技术和虚拟现实技术等
杜瑞：男，1988年生，博士生，研究方向为雷达信号处理和模式识别等
吕国云：男，1975年生，副教授，主要研究方向为信号与信息处理、语音和图像处理、虚拟现实和嵌入式系统和高速信号处理等
通讯作者:王剑书 wangjs123@mail.nwpu.edu.cn
中图分类号:TN911.7计量
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被引次数:0
出版历程
收稿日期:2018-04-12
修回日期:2018-09-04
网络出版日期:2018-09-12
刊出日期:2019-02-01
Gridless Sparse Method for Direction of Arrival Estimation for Two-dimensional Array
Jianshu WANG,,Yangyu FAN,
Rui DU,
Guoyun Lü
School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710129, China
Funds:The Foundation of Key Laboratory of Underwater Acoustic Countermeasure (kmb5494)
摘要
摘要:针对现有的适用于2维阵列的无格稀疏波达方向(DOA)估计方法性能不足的问题，该文提出一种新的方法。对2维阵列，从原子L0范数出发，证明其值等于一个以矩阵秩为目标函数的半定规划(SDP)问题的最优解。对该矩阵使用第1类有限阶贝塞尔函数近似表达，构造新的秩优化SDP问题。根据低秩矩阵恢复理论，对该SDP问题的目标函数使用log-det函数方法平滑替代，然后使用优化最小(MM)算法求解，最后通过(半)正定Toeplitz矩阵的范德蒙分解方法实现无格DOA估计。在MM算法求解模型时，使用样本协方差矩阵构造初始优化问题，减少算法迭代。仿真实验结果表明，相较于基于网格的MUSIC和其他无格DOA估计方法，该文方法具有更好的均方根误差(RMSE)性能与对相邻源的分辨能力；在快拍数充足且信噪比(SNR)较高时，适当的第1类贝塞尔函数阶数选择可以实现与较大阶数接近的RMSE性能，同时能减少运行时间。
关键词:波达方向估计/
无格/
2维阵列/
半定规划/
范德蒙分解
Abstract:For the fact that current gridless Direction Of Arrival (DOA) estimation methods with two-dimensional array suffer from unsatisfactory performance, a novel girdless DOA estimation method is proposed in this paper. For two-dimensional array, the atomic L0-norm is proved to be the solution of a Semi-Definite Programming (SDP) problem, whose cost function is the rank of a Hermitian matrix, which is constructed by finite order of Bessel functions of the first kind. According to low rank matrix recovery theorems, the cost function of the SDP problem is replaced by the log-det function, and the SDP problem is solved by Majorization-Minimization (MM) method. At last, the gridless DOA estimation is achieved by Vandermonde decomposition method of semidefinite Toeplitz matrix built by the solutions of above SDP problem. Sample covariance matrix is used to form the initial optimization problem in MM method, which can reduce the iterations. Simulation results show that, compared with on-grid MUSIC and other gridless methods, the proposed method has better Root-Mean-Square Error (RMSE) performance and identifiability to adjacent sources; When snapshots are enough and Signal-Noise-Ratio (SNR) is high, proper choice of the order of Bessel functions of the first kind can achieve approximate RMSE performance as that of higher order ones, and can reduce the running time.
Key words:Direction Of Arrival (DOA) estimation/
Gridless/
Two-dimensional array/
Semi-Definite Programming (SDP)/
Vandermonde decomposition
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