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Title: A Bayesian Framework for Spectral Reprojection

Journal Article · · Journal of Scientific Computing

Abstract Fourier partial sum approximations yield exponential accuracy for smooth and periodic functions, but produce the infamous Gibbs phenomenon for non-periodic ones. Spectral reprojection resolves the Gibbs phenomenon by projecting the Fourier partial sum onto a Gibbs complementary basis, often prescribed as the Gegenbauer polynomials. Noise in the Fourier data and the Runge phenomenon both degrade the quality of the Gegenbauer reconstruction solution, however. Motivated by its theoretical convergence properties, this paper proposes a new Bayesian framework for spectral reprojection, which allows a greater understanding of the impact of noise on the reprojection method from a statistical point of view. We are also able to improve the robustness with respect to the Gegenbauer polynomials parameters. Finally, the framework provides a mechanism to quantify the uncertainty of the solution estimate.

Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
DOE ASCR #DE-ACO5-000R22725; 9550-22-1-0411
OSTI ID:
2507483
Journal Information:
Journal of Scientific Computing, Journal Name: Journal of Scientific Computing Vol. 102 Journal Issue: 3; ISSN 0885-7474
Publisher:
Springer Science + Business MediaCopyright Statement
Country of Publication:
United States
Language:
English

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