Deconvolved Conventional Beamforming for a Horizontal Line Array
Deconvolved Conventional Beamforming for a Horizontal Line Array
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DOI：
10.1109/joe.2017.2680818
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发表时间：
2018-01-01
影响因子：
4.1
通讯作者：
Yang, T. C.
中科院分区：
文献类型：
--
作者：
Yang, T. C.
水平线阵列通常用于水下环境中，以检测/分离弱信号并估计其来自许多响亮干扰源和环境噪声的到达方向。传统的波束形成是鲁棒的，但存在胖波束和高水平旁瓣的问题。基于信号协方差矩阵的逆的高分辨率波束形成，例如最小方差无失真响应（MVDR），产生窄波束宽度和低旁瓣电平，但对信号失配敏感，并且需要许多数据快照。本文将一种用于图像去模糊的反卷积算法应用于均匀线阵（间距为半波长）的常规波束功率，以避免常用反卷积方法的不稳定性问题。去卷积的波束功率产生窄波束，以及类似于或优于高分辨率波束形成的低旁瓣电平，并且同时保持常规波束形成的鲁棒性。对于各向同性噪声，它产生比常规（和MVDR）波束成形更高的输出信噪比。性能评估与模拟和真实的数据。
Horizontal line arrays are often used in underwater environments to detect/separate a weak signal and estimate its direction of arrival from many loud interfering sources and ambient noise. Conventional beamforming is robust but suffers from fat beams and high-level sidelobes. High-resolution beamforming, based on the inverse of the signal covariance matrix, such as minimum-variance distortionless response (MVDR), yields narrow beamwidths and low sidelobe levels but is sensitive to signal mismatch and requires many snapshots of data. This paper applies a deconvolution algorithm used in image deblurring to the conventional beam power of a uniform line array (spaced at half-wavelength) to avoid the instability problems of common deconvolution methods. The deconvolved beam power yields narrowbeams, and low sidelobe levels similar to or better than high-resolution beamforming and at the same time retains the robustness of conventional beamforming. It yields a higher output signal-to-noise ratio than conventional (and MVDR) beamforming for isotropic noise. Performance is evaluated with simulated and real data.