In the paper, 1-D Root-MUSIC is generalized to 2-D case which utilizes 1-D Root-MUSIC, and the new 2-D DOA estimation method has the advantage of low computation cost.
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Liu Quan, Huangfu Kan, Chen Jianwen.2-D Root-MUSIC[J]. Journal of National University of Defense Technology,1998,20(6):61-63.