title: Sparsity-Aware DOA Estimation Scheme for Noncircular Source in MIMO Radar.
abstract: In this paper, a novel sparsity-aware direction of arrival (DOA) estimation scheme for a noncircular source is proposed in multiple-input multiple-output (MIMO) radar. In the proposed method, the reduced-dimensional transformation technique is adopted to eliminate the redundant elements. Then, exploiting the noncircularity of signals, a joint sparsity-aware scheme based on the reweighted l1 norm penalty is formulated for DOA estimation, in which the diagonal elements of the weight matrix are the coefficients of the noncircular MUSIC-like (NC MUSIC-like) spectrum. Compared to the existing l1 norm penalty-based methods, the proposed scheme provides higher angular resolution and better DOA estimation performance. Results from numerical experiments are used to show the effectiveness of our proposed method.
authors.affiliation: College of Automation, Harbin Engineering University, No. 145 Nantong Street, Harbin 150001, China. wangxianpeng@hrbeu.edu.cn.
authors.forename: Xianpeng
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Automation, Harbin Engineering University, No. 145 Nantong Street, Harbin 150001, China. wangwei407@hrbeu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Automation, Harbin Engineering University, No. 145 Nantong Street, Harbin 150001, China. xinxin_forever@126.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Automation, Harbin Engineering University, No. 145 Nantong Street, Harbin 150001, China. lq_skyven@126.com.
authors.forename: Qi
authors.initials: Q
authors.lastname: Liu
authors.affiliation: College of Automation, Harbin Engineering University, No. 145 Nantong Street, Harbin 150001, China. angleliujing@126.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
keywords: DOA estimation; MIMO radar; noncircular signal; reweighted l1 norm penalty; sparse representation