title: Calculation and correction of subaperture tilt aberration modes in synthesis imaging.
abstract: We extend the redundant spacings calibration method for finding piston coefficients affecting the elements of a dilute aperture array so that tilt phase coefficients can also be calculated and corrected without the need for assumptions about the object. The tilt coefficient retrieval method is successfully demonstrated in simulation, and the specifics of correction by image sharpness are discussed, showing that in dilute aperture systems this method does not necessarily produce a unique image.
authors.affiliation: Physics, SUPA/IIS, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Scotland, EH14 4AS, UK. a.m.johnson@lucentia.co.uk
authors.forename: Anne Marie
authors.initials: AM
authors.lastname: Johnson
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Eastwood
authors.forename: Alan H
authors.initials: AH
authors.lastname: Greenaway