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Incorporating wide-field considerations in interferometric imaging is ofincreasing importance for next-generation radio telescopes. Compressed sensingtechniques for interferometric imaging have been extended to wide fieldsrecently, recovering images in the spherical coordinate space in which theynaturally live. We review these techniques, highlighting: (i) how theeffectiveness of the spread spectrum phenomenon, due to the w componentinducing an increase of measurement incoherence, is enhanced when going to widefields; and (ii) how sparsity is reduced by recovering images directly on thesphere. Both of these properties act to improve the quality of reconstructedimages.

Intrinsic advantages of the w component and spherical imaging for wide-field radio interferometry