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Superresolution of Coherent Sources in Real-Beam Data

机译：实光束数据中相干源的超分辨率

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In this work we study the unique problems associated with resolving the direction of arrival (DOA) of coherent signals separated by less than an antenna beamwidth when the data are collected in the beamspace domain with, for example, electronically or holographically scanned antennas. We also propose a technique that is able to resolve these coherent signals. The technique is based on interpolation of the data measured by an element-space virtual array. Although the data are collected in the beamspace domain, the coherence structure can be broken by interpolating multiple shifted element-space virtual arrays. The efficacy of this technique depends on a fundamental tradeoff that arises due to a nonuniform signal-to-noise ratio (SNR) profile across the elements of the virtual array. This profile is due to the structure imposed by the specific beam pattern of the antenna. In addition to describing our technique and studying the SNR profile tradeoff, we also incorporate a strategy for improving performance through a subswath technique that improves covergence of covariance estimates.
机译：在这项工作中，我们研究了当使用电子或全息扫描天线在波束空间域中收集数据时，解决相干信号的到达方向（DOA）小于天线波束宽度的问题。我们还提出了一种能够解析这些相干信号的技术。该技术基于元素空间虚拟数组测得的数据的插值。尽管数据是在波束空间域中收集的，但是可以通过对多个移位的元素空间虚拟数组进行插值来破坏相干结构。该技术的效率取决于基本的权衡，该权衡是由于虚拟阵列的各个元素上的信噪比（SNR）分布不均匀而引起的。该轮廓归因于天线的特定波束方向图所强加的结构。除了描述我们的技术和研究SNR配置文件的权衡之外，我们还采用了一种通过子区间技术提高性能的策略，该技术可以改善协方差估计的覆盖范围。

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