Abstract
The application of the PE method for the prediction of wave propagation requires the selection of the reference sound speed, c0, which is related to the reference wave number k0. The influence on the acoustic field by the choice of the c0 is rarely visible. Even if it is noticeable, the difference is small and is usually negligible. In a realistic application to solve a scattering problem by a PE-type method, the choice of c0 was found to produce different acoustic results when compared with a known reference exact solution. These differences in acoustic fields are not small and may be considered non-negligible. A proper choice of the c0 was made using a range-dependent c0 formula introduced by Pierce; then, an accurate calculation of the acoustic field was achieved by the proper choice. In this paper, use is made of the numerical results to discuss the c0 influence. [Work supported jointly by ONR and NUSC.]
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