线阵DOA估计中由于阵元间距偏大造成了估计模糊的现象,产生了虚假的估计角度。通过修正导向矢量的算法,打破虚假角度和真实角度形成的导向矢量完全相同的平衡,造成这两种导向矢量不完全相同的结果,可以极大的抑制由于阵元间距偏大造成的估计模糊现象。为避免调整和增加天线,还可以采用虚拟阵列变化的辅助方法。最终算法通过计算仿真得到验证。该算法在降低计算量以及算法可实施性等方面都具有很强优势。

The ambiguity problem which produces the false estimated angles in the linear array’s DOA estimation is caused by the larger array element spacing. By the steering vector’s revision, the balance of steering vectors being equal totally generated by the real angle and the false angle was broken, the result of revision, which made the two steering vectors not be equal totally, restrained the ambiguities generated in DOA estimation greatly. To avoid the adjustment and addition to the antennas, the method of virtual array was adopted. The algorithm was verified by the computer simulation. The last algorithm has a big advantage in computation complexity reduction and practice possibility.