Calculation and correction of piston phase aberration in synthesis imaging

Richard J. Eastwood, Anne Marie Johnson, Alan H. Greenaway

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The principle of redundant spacings calibration has previously been described for the purpose of calibrating piston phase aberration affecting elements of a dilute aperture array using a system of linear equations in terms of the aperture phases as well as object phase information. Here we develop matrices for the correction of piston phase aberration by use of image sharpness and also by phase retrieval. These are both presented in wavefront sensor formulation in order to draw analogy between the approaches. We then discuss solution ambiguity affecting both methods and describe array design criteria to prevent such ambiguity. The problem of increased image aliasing under image sharpness correction is also highlighted. © 2008 Optical Society of America.

Original languageEnglish
Pages (from-to)195-205
Number of pages11
JournalJournal of the Optical Society of America A
Issue number1
Publication statusPublished - 1 Jan 2009


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