期刊
IEEE ACCESS
卷 7, 期 -, 页码 148771-148778出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2943167
关键词
Direction-of-arrival estimation; multiple-input multiple-output radar; non-orthogonal waveforms; propagator
资金
- National Natural Science Foundation of China [61701046, 61861015]
- Hainan Natural Science Foundation Innovation Research Team Project [2017CXTD0004]
- Key Project of Scientific Research of Higher Education in Hainan Province [Hnky2019ZD-35]
- Collaborative Innovation Fund of Tianjin University [HDTDU201906]
- Hainan University [HDTDU201906]
This paper discusses the direction-of-arrival (DOA) estimation problem in multiple-input multiple-output (MIMO) radar with non-orthogonal waveforms. Unlike the traditional orthogonal waveforms-based counterparts, spatially colored noise as well as corrupted virtual direction matrix would appear due to the correlated waveforms in DOA estimation. To tackle these issues, an improved propagator estimator is developed. The spatially colored noise caused by waveform imperfectly is eliminated via cross-correlation technique. Thereafter, DOA is obtained by exploiting the propagator and invariant techniques. The proposed estimator does not involve eigendecomposition of the high dimensional matrix, and it provides closed-form solution for DOA estimation. Compared with the existing frameworks, it is computationally much more economic. Moreover, it offers very close DOA estimation accuracy to the matrix-based methods. Numerical simulations are carried out to show the improvement of the proposed estimator.
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