Prolate spheroidal wave functions on a disc-Integration and approximation of two-dimensional bandlimited functions

Yoel Shkolnisky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We consider the problem of integrating and approximating 2D bandlimited functions restricted to a disc by using 2D prolate spheroidal wave functions (PSWFs). We derive a numerical scheme for the evaluation of the 2D PSWFs on a disc, which is the basis for the numerical implementation of the presented quadrature and approximation schemes. Next, we derive a quadrature formula for bandlimited functions restricted to a disc and give a bound on the integration error. We apply this quadrature to derive an approximation scheme for such functions. We prove a bound on the approximation error and present numerical results that demonstrate the effectiveness of the quadrature and approximation schemes.

Original languageEnglish
Pages (from-to)235-256
Number of pages22
JournalApplied and Computational Harmonic Analysis
Volume22
Issue number2
DOIs
StatePublished - Mar 2007
Externally publishedYes

Keywords

  • Approximation
  • Bandlimited
  • Interpolation
  • Prolate spheroidal wave functions
  • Quadrature

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