水下小体积阵的二维宽带目标被动定位

2D passive localization of broadband sources with a small volume array

传统的宽带聚焦波达方向估计算法需要预估方位信息,不准确的前期预估将使最终估计结果出现较大误差。研究了一种基于无噪相关矩阵的二维宽带聚焦算法,利用各频点的频域无噪相关矩阵构造聚焦矩阵,不需要进行前期预估,避免了前期预估对最终估计结果的影响,且适用于任意结构阵列。该算法计算复杂度低,分辨率高,估计误差小。当基阵布放的深度已知时,可实现目标定位。基于9元体积阵的目标被动定位,对该算法进行了验证。

The conventional wideband focusing DOA estimation methods need pre-estimated directions of the targets, and the inaccurate direction pre-estimation results in the final estimated result with a large error. A wideband focusing method based on the noise-free correlation matrix in the frequency domain is studied in this paper. This method does not require pre-estimated directions and is suitable for arbitrary arrays. Two-dimension localization can been achieved when the depth of the array is known. The simulation results of a small volume array with nine elements show the effectiveness of this method.