Staggered-grid Pseudospectral Time Domain (PSTD) Method Using Real Fourier Transform for 2.5D Electromagnetic Wave Propagation
The staggered grid algorithm was originally invented for achieving better stability and efficiency in the finite difference time domain (FDTD) method for modeling the electromagnetic wave propagation. Seismologists extended the staggered grid approach to the pseudospectral time domain (PSTD) scheme to model seismic wave propagation. However, no detailed formulation of the staggered grid approach for electromagnetic (EM) simulations has been explicitly discussed. We present the staggered grid PSTD for EM simulations by shifting the spatial deriva-tives halfway between 2 adjacent nodes and making the Nyquist wave number a non-zero pure real value of -π／△x. By doing this, the Nyquist information of the original spatial function is preserved, and the differentiation operator is more stable. In the Fourier domain, adding trigonometric factors in the classic Fourier coefficients is equivalent to the staggered grid approach in the original space domain. A staggered grid PSTD algorithm makes the time marching more stable, and numerical dispersion is suppressed for models with sharp contrasts in material properties. In this paper, we have applied the staggered grid PSTD method to 2.5D electromagnetic wave propagation simulations using the real Fourier transform. We discuss this method and apply it to model a Ground Penetrating Radar (GPR) system.
Lanbo Liu Benjamin Barrowes Zhao Zhao
Department of Civil & Environmental Engineering,University of Connecticut,USA;Cold Regions Research Cold Regions Research and Engineering Laboratory,USA Department of Civil & Environmental Engineering,University of Connecticut,USA
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-6
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）