Establishing and Investigating an Effective Atmosphere-Ocean Cross-Medium Propagation Model Based on GSM Beams

Using the Gaussian-Schell model (GSM) beam as the light source, this study creates a blue-green beam atmosphere-ocean cross-medium propagation model (AOCPM) based on the extended Huygens-Fresnel principle and the linear filtering method. The closed expression of the Cross Spectral Density Function (CSDF) of the GSM beam after propagation through atmospheric turbulence, atmosphere-ocean interface, and ocean turbulence are derived. And the correctness of the model is verified by simulating the changes in intensity, relative beam width, and speckle normalized intensity autocorrelation function during the propagation of the GSM beam through the atmosphere-ocean cross-medium under different parameters. The findings demonstrate that the intensity of the GSM beam after being propagated through the atmosphere-ocean medium presents a speckle-like Gaussian distribution, the intensity of the GSM beam gradually attenuates, the relative beam width gradually grows, and the speckle normalized intensity autocorrelation function gradually decreases as the turbulence intensity and propagation distance increase. In addition, the increase in wind speed at rough sea surface mainly leads to the attenuation of intensity. The work of this paper provides a new idea for the study of atmosphere-ocean cross-medium propagation of blue-green beams.