虚拟阵列变换解到达角模糊研究

Research on solving ambiguity technology using virtual array transformation

在进行宽频段波达方向估计时,频率高端可能会出现阵元间距大于半波长的情况,从而会引起角度模糊,无法分辨出真实的波达方向。本文利用虚拟阵列变换技术,使存在角度模糊的阵列虚拟为一个阵元间距较小的虚拟阵列,该虚拟阵列的阵元间距小于最高频率的半波长,使其满足无模糊阵列的条件。然后利用虚拟后的阵列进行到达角估计,得到无模糊的到达角估计值。仿真实验验证了本文方法在频率高端能有效地解决多值模糊的问题,具有良好的适应性和实用性。

In the high band of the frequency, the space between the arrays may longer than half of the wavelength, which can cause angle Ambiguity in the broadband direction of arrival estimation. This paper transforms the ambiguous array to a small array, which has a shorter space between array elements and is not ambiguous, using the virtual array transformation technique. Then use the virtual array to get the unambiguous direction of arrival. Simulative experiments show the method proposed can solve the angle anbiguity effectively,has a broad adaptability and practicability