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Approximate solution of a Cauchy problem for the Helmholtz equation

Teresa Regińska1 and Kazimierz Regiński2

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A problem of reconstruction of the radiation field in a domain \Omega\subset {\bb R}^3 from experimental data given on a part of boundary is considered. For the model problem described by a Cauchy problem for the Helmholtz equation, an approximate method based on regularization in the frequency space is analysed. Convergence and stability are proved under a suitable choice of regularization parameter. Numerical implementation of the method is discussed.


PACS

02.30.Jr Partial differential equations

02.30.Lt Sequences, series, and summability

02.60.-x Numerical approximation and analysis

MSC

35J05 Laplace equation, reduced wave equation (Helmholtz), Poisson equation (See also 31Axx, 31Bxx)

30E20 Integration, integrals of Cauchy type, integral representations of analytic functions (See also 45Exx)

65F22 Ill-posedness, regularization

Subjects

Mathematical physics

Computational physics

Dates

Issue 3 (June 2006)

Received 10 October 2005, in final form 19 March 2006

Published 17 May 2006



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