期刊
SIGNAL PROCESSING
卷 135, 期 -, 页码 147-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.sigpro.2016.12.031
关键词
Multiple-input multiple-output radar; Direction of arrival estimation; Sparse representation; Noncircular signal; Nuclear norm minimization
资金
- National Natural Science Foundation of China [61571174]
In this paper, the direction of arrival (DOA) estimation for noncircular sources in multiple-input multiple output (MIMO) radar is dealt with by a novel nuclear norm minimization (NNM) framework. The proposed method exploits the noncircular property of signals to extend the data model for doubling the array aperture. Then a block sparse model of the extended data is formulated without the influence of the unknown noncircularity phase, and a novel signal reconstruction algorithm based on nuclear norm minimization is proposed to recover the block-sparse matrix. In addition, a weight matrix based on the reduced dimensional noncircular Capon (RD NC-Capon) spectrum is designed to reweight the nuclear norm minimization for enhancing the sparsity of solution. Finally, the DOA is estimated from the non-zero blocks of the reconstructed matrix. Due to exploiting the extended array aperture and block-sparse information, the proposed method provides superior DOA estimation performance and higher angular resolution. Furthermore, the proposed method has a low sensitivity to the priori information on the number of sources. Simulation results are presented to verify the effectiveness and advantages of the proposed method.
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