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Extending the Fourier Transform – The Positivity Constraint

Published online by Cambridge University Press:  12 April 2016

M.M. Komesaroff  and
I. Lerche
M.M. Komesaroff
Affiliation:
Division of Radiophysics, CSIRO, Sydney, Australia
I. Lerche
Affiliation:
Division of Radiophysics, CSIRO, Sydney, Australia

Extract

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In radio astronomy it is often necessary to estimate a brightness distribution from a limited number of samples of its Fourier transform. The manifest requirement that the brightness distribution be everywhere positive imposes definite constraints on its Fourier transform which yield information about unmeasured Fourier components. Here we discuss the question: given the first n+1 values, p0, P1 … pn, of a uniformly sampled Fourier transform of a real positive function, what can we say about Fourier terms of higher order?

Type
Part V: Maximum Entropy Image Reconstruction
Information
International Astronomical Union Colloquium , Volume 49: Image Formation from Coherence Functions in Astronomy , 1979 , pp. 241 - 247
Copyright
Copyright © Reidel 1979

References

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