Ray-tracing Algorithm for Solving Equation Equations with Arbitrary Surface and Heterogeneous Media
A ray tracing and surface technology, applied in seismology, instruments, measuring devices, etc., can solve the problem that the FMM algorithm can not solve the function equation, and achieve the effect of satisfying the wavefront propagation law, high calculation efficiency, and improving calculation accuracy.
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[0039] Step 1: Establish a velocity grid model (Velocity grids), mesh the surface, and give the velocity value of each grid point. Generally speaking, compared with the propagation grids, the velocity grid is more coarsely divided.
[0040]Step 2: first establish the undulating terrain model, perform propagation grid division, and divide it into triangular meshes. Dividing triangular meshes is to establish acute-angled triangles. Specifically, it is divided into establishing equilateral triangles on the horizontal plane without considering surface undulations; and if Considering the ups and downs of the terrain, the interior angle of the established triangle is around 60 degrees. In order to ensure the efficiency of the algorithm, the terrain undulations are smoothed to a certain extent. Finally, an arbitrary undulating terrain model with a certain degree of smoothness is obtained ( figure 2 ). In addition, the grid near the source is refined to ensure the accuracy of calcu...
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