Wideband super-resolution imaging in Radio Interferometry via low rankness and joint average sparsity models (HyperSARA)
Wideband super-resolution imaging in Radio Interferometry via low rankness and joint average sparsity models (HyperSARA)
复制标题
通过低秩和联合平均稀疏模型(HyperSARA)进行无线电干涉测量中的宽带超分辨率成像
DOI:
10.1093/mnras/stz2117
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发表时间:
2019
影响因子:
4.8
通讯作者:
Abdulaziz A
中科院分区:
文献类型:
--
作者:
Abdulaziz A
We propose a new approach within the versatile framework of convex optimization to solve the radio-interferometric wideband imaging problem. Our approach, dubbed HyperSARA, leverages low rankness, and joint average sparsity priors to enable formation of high-resolution and high-dynamic range image cubes from visibility data. The resulting minimization problem is solved using a primal-dual algorithm. The algorithmic structure is shipped with highly interesting functionalities such as preconditioning for accelerated convergence, and parallelization enabling to spread the computational cost and memory requirements across a multitude of processing nodes with limited resources. In this work, we provide a proof of concept for wideband image reconstruction of megabyte-size images. The better performance of HyperSARA, in terms of resolution and dynamic range of the formed images, compared to single channel imaging and theclean-based wideband imaging algorithm in thewscleansoftware, is showcased on simulations and Very Large Array observations. Ourmatlabcode is available online ongithub.
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DOI:
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发表时间:
2015
期刊:
影响因子:
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作者:
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通讯作者:
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影响因子:
4.8
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发表时间:
2017
期刊:
European Signal Processing Conference
影响因子:
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通讯作者:
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影响因子:
4.8
作者:
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