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Abstract

This paper puts forward a full-wave equation based method for illumination analysis. The kernel and most time-consuming part of illumination analysis is to compute the source-side and receiver-side wavefields. In this paper, we introduce the nearly analytic discrete (NAD) method to simulate the wave propagation. Specially, the Runge-Kutta method which is one of the NAD methods is used in this paper. The advantage of the NAD method is that it uses both the gradients of the displacements and particle velocities to reconstruct the wavefields. This not only can suppress the numerical dispersion effectively when coarse grids are used or large velocity contrasts exist, but also provides us with the necessary and accurate information for computing Poynting vectors. We then use the Poynting vectors to obtain direction information. Because of using full-wave equation, this approach has no angle limitations and includes all the arrivals. Both the using of Poynting vectors and the feature that NAD method can work on coarse grids and larger time steps make our method more efficient. Numerical examples show the validity and feasibility of the new method.

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/content/papers/10.3997/2214-4609.20130614
2013-06-10
2024-03-29
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