基于数值方法的激光海面漫反射通信能量分布特性

Energy distribution of communication by laser diffusion from sea surface based on forward-backward method

针对激光点对点通信方式的不足,提出了利用海面作为激光漫反射媒介进行组网通信的设想,采用前后向迭代的数值方法结合Green函数谱积分加速算法(FBM/SAA)对激光海面漫反射通信的能量分布特性进行了研究。通过对激光光束入射海面后产生的散射场的分析、计算及实验验证,得出了较为准确的2维激光海面双站散射系数,并对激光光束入射海面后的散射场进行了分析。研究结果表明:入射激光束经过粗糙海面散射后,能量大部分集中在前向散射区域上,而后向散射强度很弱,且在散射场的边缘处能量迅速衰减,说明了激光海面漫反射组网通信方法的可行性。通过与前后向迭代法和Kirchhoff近似方法的计算结果的比较,说明了FBM/SAA是一种高效、准确的计算方法。

Aiming at the shortcomings of laser point to point communication, the assumption of building the communication networks by laser diffusion from sea surface is come up with according to the need of real sea battle. The energy distribution characteristics of scattered field is studied using forward-backward method（FBM） combined with Green spectral acceleration algorithm （SAA）. The accurate 2D laser scattering coefficients from sea surface are obtained and the results are verified by experiments. The results showed that the energy scattered from sea surface are concentrated in the forward zone, less in the backward zone, and attenuated fast in the edges of the scattered field. The feasibility of building communication network by laser diffusion from sea surface among vessels is illustrated. And compared with the results of FBM and Kirchhoff algorithm（KA）, it can be seen that FBM/SAA is a relatively effective and accurate algorithm.