关键词: 宽带信号, 波达方向估计, 投影子空间, 正交性, Toeplitz化

Abstract: A new fast algorithm was proposed to solve the heavy computational load of coherent wideband signal DOA (Direction Of Arrival) estimation. Firstly, through Toeplitz technique of matrix, incoherent wideband signals were obtained without any division for the array. Secondly, according to the character of Hermitian matrix of received data, utilized the unitary transformation matrix, the real matrix could be acquired and the computation of eigendecomposition could be decreased. Finally, through the orthogonality technique of projected subspaces, new space spectrum was acquired with noise subspace and conjugate noise subspace, and the DOA could be obtained just through the angle search from zero to ninety degree in semi-spectrum according to the symmetrical spectrum, while the computational complexity for the search of spectrum peak was reduced by half. The theoretical analysis and simulation results show that the new algorithm has higher precision and smaller computational load, and it is effective for wideband coherent signals.

Key words: wideband signal, Direction Of Arrival (DOA) estimation, projected subspace, orthogonality, Toeplitz technique