基于双频互质阵列的 DOA 估计方法.

Under the condition of single-frequency operation for co-prime array，discarding the non-uniform virtual elements in the difference co-array brings about the number loss of the resolvable sources in DOA estimation. This paper proposed a DOA estimation algorithm to improve the number of the resolvable sources based on the co-prime array with dual-frequency operation. By selecting single proper additional operation frequency，it obtained the additional different positions of virtual elements in the difference co-array to fill two missed virtual elements in the difference co-array of co-prime array with the reference operation frequency. Compared with the single-frequency operation，the proposed dual-frequency operation acquired more uniform virtual elements，improving the degree-of-freedom of DOA estimation which resulted in the DOA estimation for more incoherent sources. More specifically，corresponding to a co-prime array with N + 2M - 1 physical elements，the dual-frequency operation improves the degree-of-freedom by M and increases the number of resolvable incoherent sources in DOA estimation by M. [ABSTRACT FROM AUTHOR]