宽场射电干涉测量中w分量和球面成像的内在优势
Intrinsic advantages of the w component and spherical imaging for wide-field radio interferometry
摘要：
在干涉成像中考虑宽视场对下一代射电望远镜越来越重要。用于干涉成像的压缩感知技术最近已经扩展到广泛的领域，在它们自然存在的球坐标空间中恢复图像。我们回顾这些技术，突出：（一）如何有效的扩频现象，由于w分量引起的测量不相干性的增加，增强时去宽场;和（ii）稀疏性如何减少直接恢复图像的领域。这两个属性都用于提高重建图像的质量。
英文摘要：
Incorporating wide-field considerations in interferometric imaging is of increasing importance for next-generation radio telescopes. Compressed sensing techniques for interferometric imaging have been extended to wide fields recently, recovering images in the spherical coordinate space in which they naturally live. We review these techniques, highlighting: (i) how the effectiveness of the spread spectrum phenomenon, due to the w component inducing an increase of measurement incoherence, is enhanced when going to wide fields; and (ii) how sparsity is reduced by recovering images directly on the sphere. Both of these properties act to improve the quality of reconstructed images.
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