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Field of view for near-field aperture synthesis imaging.


Type

Article

Change log

Authors

Buscher, David F 

Abstract

Aperture synthesis techniques are increasingly being employed to provide high angular resolution images in situations where the object of interest is in the near field of the interferometric array. Previous work has showed that an aperture synthesis array can be refocused on an object in the near field of an array, provided that the object is smaller than the effective Fresnel zone size corresponding to the array-object range. We show here that, under paraxial conditions, standard interferometric techniques can be used to image objects that are substantially larger than this limit. We also note that interferometric self-calibration and phase-closure image-reconstruction techniques can be used to achieve near-field refocusing without requiring accurate object range information. We use our results to show that the field of view for high-resolution aperture synthesis imaging of geosynchronous satellites from the ground can be considerably larger than the largest satellites in Earth orbit.

Description

Keywords

astro-ph.IM, astro-ph.IM

Journal Title

Opt Lett

Conference Name

Journal ISSN

0146-9592
1539-4794

Volume Title

40

Publisher

The Optical Society