Full text of article: Russian language.

Abstract:
Ways for acceleration of Kirchhoff integral owing to using of analytical transformations and the effective program realization are described in present article. Consecutive steps of the speed increase after every transformation are shown. Application conditions of different approximations are obtained. It should be noted that after an application of all transformations the time of program performance weakly depends on the distance between input and output planes.

Key words: Kirchhoff integral, paraxiality, quadrature formula, asymptotic expansion.

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