当2个信号功率相差较大时,常规的空间谱估计算法往往不能估计出弱信源的波达方向(Direction of Arrival,DOA)。 针对该问题,文中基于强干扰和弱信源对应的特征矢量具有保向正交性这一特性,提出了一种强干扰背景下相干弱信源 DOA估计方法—特征矢量剔除法。相比于其他算法,该算法最大的优点是无需预知强干扰的方位及数目信息,实施简 单,运算量较小。计算机仿真结果证明了所提算法的正确性和有效性。

The classical spatial spectrum estimation algorithms will not be able to estimate the direction of arrival (DOA) of weak signal when the power difference of impinging signals on the arrays is very large. On the basis of the strong jamming and weak signal eigenvectors to maintain the character of the directional orthogonal under certain condition, a novel DOA algorithm called eigenvectors eliminated method (EEM) for coherent weak signals under strong jamming environment is proposed compared with other algorithms, the proposed algorithm could operate easily without knowing the azimuth and number of the jamming, and has small computational complexity. The correction and efficiency of the proposed method are verified by the computer simulation results.