Point-spread-function calibration of dilute aperture imagery

E. Keith Hege; Matthew Cheselka; Richard G. Dekany; D'nardo Colucci

doi:10.1117/12.162010

9 November 1993 Point-spread-function calibration of dilute aperture imagery

E. Keith Hege, Matthew Cheselka, Richard G. Dekany, D'nardo Colucci

Proceedings Volume 2029, Digital Image Recovery and Synthesis II; (1993) https://doi.org/10.1117/12.162010
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Astronomical speckle holographic methods are shown to calibrate the image blurring effects of the large fraction of the energy in the side-lobes of the point spread function of a dilute aperture imaging system. This self calibration method works for imagery which contains a local point-like reference within the partially isoplanatic field of view. The reference may be a physical object within the (partially isoplanatic) field of view or it may be reconstructed by iterative deconvolution. Data reductions with an iterative deconvolution algorithm show even more striking performance than speckle holography. Atmospheric modeling was used to simulate multiple observations of the same target object with a 5 m dilute aperture pupil with different point spread functions. The iterative deconvolution algorithm recovers Fourier interpolated results for the equivalent 25 m filled aperture without requiring independent observations of a point-like reference source.

Citation Download Citation

E. Keith Hege, Matthew Cheselka, Richard G. Dekany, and D'nardo Colucci "Point-spread-function calibration of dilute aperture imagery", Proc. SPIE 2029, Digital Image Recovery and Synthesis II, (9 November 1993); https://doi.org/10.1117/12.162010

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