运动阵列非重叠孔径扩展算法

A Non-Overlap Mode-Based Extended Aperture Algorithm for Moving Array

现有线阵列被动合成阵列算法无法满足非连续信号和非均匀线阵列的处理需要,难以被直接用来提高运动线阵列对时域重叠脉冲信号的空间分辨能力。针对这一问题,本文提出一种能够同时满足对非连续信号和非均匀线阵列处理需求的运动阵列非重叠孔径扩展算法。该算法首先通过二维MUSIC算法估计运动阵列的"相位校正因子",进而完成阵列孔径扩展实现对多个时域重叠信号的高分辨方向估计。通过仿真研究可知:小孔径运动阵列利用本算法在不牺牲方向估计精度的条件下,可以有效提高对多信号的分辨能力,且具有较好的低信噪比适应能力。

The existing passive synthetic array algorithms can not be applied in the domains of noncontinuous signals and nonuniform array,and these algorithms can not be applied directly to improve the resolution power of pulse signals for moving linear arrays.Accordingly,a non-overlap mode-based new extended aperture algorithm for moving array applied in the domains of both noncontinuous signals and nonuniform arrays is proposed.According to this new algorithm,first the phase correction factors are estimated by using 2D-MUSIC algorithm,then the physical aperture of array can be extended by utilizing these phase correction factors and the directions of multiple signals can be high-resolution estimated.The simulation results have shown that this algorithm for moving array can improve resolution power for multiple signals without loss of direction estimation accuracy.In addition this algorithm can also perform well in low SNR conditions.