Abstract:

In order to improve the resolution of numerical calculation of electromagnetic wave fields, the differences between finite difference time domain (FDTD) method and psedo-spactral time domain (PSTD) algorithm were studied. The FDTD method is a common numerical calculation method of electromagnetic wave fields, and it is widely applied to the solution of the partial derivative equations related to time.More memory is needed using FDTD method in large-scale numerical calculation. The PSTD algorithm is based on FDTD method and employs fast Fourier transform (FFT) to calculate the spatial derivatives in Maxwell's equations. Due to accuracy by FFT, the calculation precision is improved and grid numbers needed is decreased greatly by using PSTD algorithm. The PSTD algorithm has the advantage of saving computational memory space and is suitable for large-scale numerical calculation of forward modeling and inversion.

Key words: numerical calculation, finite difference time domain method, pseudospectral time domain algorithm, fast Fourier transform algorithm, precision