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Image motion compensation by area correlation and centroid tracking of solar surface featuresAn experimental solar correlation tracker was tested and evaluated on a ground-based solar magnetograph. Using sunspots as fixed targets, tracking error signals were derived by which the telescope image was stabilized against wind induced perturbations. Two methods of stabilization were investigated; mechanical stabilization of the image by controlled two-axes motion of an active optical element in the telescope beam, and electronic stabilization by biasing of the electron scan in the recording camera. Both approaches have demonstrated telescope stability of about 0.6 arc sec under random perturbations which can cause the unstabilized image to move up to 120 arc sec at frequencies up to 30 Hz.
Document ID
19830024419
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Nein, M. E. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Mcintosh, W. R. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Cumings, N. P. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1983
Subject Category
Astronomy
Report/Patent Number
NASA-TM-82538
NAS 1.15:82538
Accession Number
83N32690
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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