Realization of a Virtual Experiment Laser Environment Propagation Model Based on Split-step Fourier Method in Rain

This paper proposed a laser environment propagation model based on the split-step Fourier method and the phase screen for a continuous random medium that suitable for the virtual experiment. Combined with von Karman PSD and Parsons law rain drop distribution Model, Fast-Fourier-transform-based model of phase screens are used to simulate the turbulence and continuous random medium induced phase variance. In the vacuum propagation, this paper adopted Angular-spectrum method to improve computational efficiency. The results of the laser propagation environment are compared with the known theoretical estimates coherence factor and the intensity attenuation in rain.