在随机介质效应和传感器位置不确定性造成空间相干性损失的水下环境中,对多个阵列进行相干处理

I. Kirsteins, A. Abawi
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引用次数: 0

摘要

在理想情况下,相干波束成形多个分布式阵列应比单独处理阵列和非相干组合阵列的标准方法有所改进。这些改进包括提高指向性和增益。然而,在真实海洋中对空间上分离的阵列进行相干处理时,有两个主要挑战,一是如何处理由随机介质效应(如内波)和传感器位置不确定性造成的相干损失或波前失真。其中的一些后果是贝叶振型退化和阵列指向性变差。在本文中,我们利用数值传播模型和理论进行了基于仿真的研究,考察了随机介质效应(如内波和传感器位置不确定性)引起的波前畸变对代表性海洋波导中相干波束成形分布式阵列的影响。波前畸变的真实情况是根据实际内波测量结果和模型生成的。相干处理过程对这些效应的敏感性表现为阵列指向性中产生的振型和损失,以及容差的量化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On coherently processing multiple arrays in underwater environments with spatial coherence losses from random medium effects and sensor position uncertainties
Under ideal circumstances coherently beamforming multiple distributed arrays should provide improvements over the standard approach of processing the arrays individually and combining them incoherently. These include improved directivity and higher gain. However, two major challenges when coherently processing spatially separated arrays in a real ocean are dealing with coherence losses or wave front distortions caused by random medium effects like internal waves and uncertainties in sensor locations. Some of the consequences are degraded beampatterns and poorer array directivity. In this paper, we perform a simulation-based study utilizing numerical propagation models along with theory examining the effects of wave front distortions induced by random medium effects like internal waves and sensor position uncertainties on coherently beamforming distributed arrays in representative ocean waveguides. Realistic realizations of wave front distortions are generated from actual internal wave measurements and models. The sensitivities of coherent processing to these effects are characterized by resultant beampatterns and losses in array directivity along with a quantification of the tolerances.
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