Astronomical imaging by filtered weighted-shift-and-add technique

The weighted-shift-and-add speckle imaging technique is analyzed using simple assumptions. The end product is shown to be a convolution of the object with a typical point-spread function (psf) that is similar in shape to the telescope psf and depends marginally on the speckle psf. A filter can be applied to each data frame before locating the maxima, either to identify the speckle locations (matched filter) or to estimate the instantaneous atmospheric psf (Wiener filter). Preliminary results show the power of the technique when applied to photon-limited data and to extended objects.

[1]  R. Bates,et al.  Towards true imaging by wideband speckle interferometry , 1980 .

[2]  R. Bates.  Astronomical speckle imaging , 1982 .

[3]  E. K. Hege,et al.  Seeing calibration of optical astronomical speckle interferometric data , 1985 .

[4]  B. Wirnitzer,et al.  Image reconstruction by the speckle-masking method. , 1983, Optics letters.

[5]  C. Lynds,et al.  Digital image reconstruction applied to alpha Orionis , 1976 .

[6]  E. K. Hege,et al.  The steward observatory speckle interferometry system , 1982 .

[7]  Erez N. Ribak,et al.  Statistical Analysis of the Weighted Shift and Add Image Reconstruction Technique , 1985, Optics & Photonics.

[8]  B. Roy Frieden,et al.  Probability, Statistical Optics, And Data Testing , 1982 .

[9]  A. Greenaway,et al.  Estimation of spatial power spectra in speckle interferometry , 1979 .

[10]  F. Roddier.  V The Effects of Atmospheric Turbulence in Optical Astronomy , 1981 .

[11]  Joseph W. Goodman,et al.  Fundamental Limitations In Linear Invariant Restoration Of Atmospherically Degraded Images , 1976, Other Conferences.

[12]  J. W. Goodman,et al.  Photon Limited Images and Their Restoration , 1976 .

[13]  Bobby R. Hunt,et al.  Analysis of the shift-and-add method for imaging through turbulent media , 1983 .

[14]  Erez N. Ribak,et al.  Images From Astronomical Speckle Data: Weighted Shift-And-Add Analysis , 1986 .

[15]  Erez N. Ribak,et al.  Self-calibrating shift-and-add technique for speckle imaging , 1986 .

[16]  Erez N. Ribak,et al.  Use Of Matched Filtering To Identify Speckle Locations. , 1985, Optics & Photonics.

[17]  J. C. Dainty,et al.  Stellar Speckle Interferometry , 1976 .

[18]  R. H. T. Bates,et al.  Generalization Of Shift-And-Add Imaging , 1985, Optics & Photonics.