Adaptive weighting in radio interferometric imaging
Adaptive weighting in radio interferometric imaging
复制标题
无线电干涉成像中的自适应加权
DOI：
10.1093/mnras/stu1494
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
S. Yatawatta
中科院分区：
文献类型：
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作者：
S. Yatawatta
无线电干涉仪观测天空的傅立叶空间，其位置由阵列几何形状决定。在通过傅立叶变换构造真实的空间图像之前，对数据进行加权以提高重建质量。计算权值的两个准则是最大化灵敏度和最小化点扩展函数（PSF）旁瓣电平。本文提出了一种适用于超深成像实验的加权方案。建议的加权方案是用来最大限度地提高灵敏度，同时最大限度地减少跨频率和多个历元的PSF旁瓣变化。我们给出的仿真结果表明，所提出的方案相比，常用的加权方案在实现这些目标的优越性。
Radio interferometers observe the Fourier space of the sky, at locations determined by the array geometry. Before a real space image is constructed by a Fourier transform, the data is weighted to improve the quality of reconstruction. Two criteria for calculation of weights are maximizing sensitivity and minimizing point spread function (PSF) sidelobe levels. In this paper, we propose a novel weighting scheme suitable for ultra deep imaging experiments. The proposed weighting scheme is used to maximize sensitivity while minimizing PSF sidelobe variation across frequency and multiple epochs. We give simulation results that show the superiority of the proposed scheme compared with commonly used weighting schemes in achieving these objectives.