These routines model tropospheric radiowave propagation over variable terrain and calculates propagation loss vs. height and range. Propagation loss is displayed in dB contours on a height vs. range plot. TPEM is based on the split-step Fourier PE me

使用有限差分法和分裂步傅里叶解法求解抛物方程，并增加散射体和地形的建模仿真。-Using the finite difference method and the split-step Fourier solution for solving the parabolic equation, and increase the scatterer and terrain modeling and simulation.

Matlab计算非线性薛定谔方程的分布傅立叶算法(split step fourier method for nonlinear Schrodinger equation)