基于简化内波方程的光学隐蔽深度模型建立与分析

Establishment and analysis of optical concealed depth model based on simplified equation

非均匀海水条件下,光学隐蔽深度模型(OCD_LAYER)建立在海水按照垂直线上分割成光学特性近似的相似层的基础之上,为了研究海洋内波条件下OCD_LAYER模型的适用性,根据对比度和两层流体内孤立波KDV方程,通过构造内波垂向结构,计算出位移均方根最大层为内波简化两层界面,并依此建立内波简化模型条件下光学隐蔽深度模型(OCD_KDV)。计算并分析了水下航行体表面反射比、海水衰减系数、观察天顶角、空气消光系数变化对内波简化模型条件下光学隐蔽深度模型的影响。结果表明,在最高探测概率下,特征尺度为36m的水下航行体光学隐蔽深度在深远海海水中数值为36.79m;在近海海水中数值为22.08m;在沿岸海水中数值为11.04m。实验结果为水下航行体光学隐蔽性提供了重要理论参考。

The Optical Concealed Depth Model(OCD_AYER)under non-uniform seawater conditions is established on the basis of dividing seawater into similar layers with optical properties approximated by vertical lines,in order to study OCD under ocean internal wave conditions_The applicability of the LAYER model is based on contrast and the KDV equa-tion of solitary waves in two layers of fluid.By constructing the vertical structure of internal waves,the maximum root mean square displacement layer is calculated as the simplified interface between the two layers of internal waves.Based on this,an optical concealment depth model(OCD_KDV)under the condition of simplified internal wave model is established.We cal-culated and analyzed the effects of underwater vehicle surface reflectance,seawater attenuation coefficient,observation and measurement height and zenith angle,and changes in air extinction coefficient on the optical concealment depth model un-der the simplified internal wave model conditions.The simulation results show that at the highest detection probability,the optical concealment depth of an underwater vehicle with a feature scale of 36 m is 36.79 m in deep sea water.In nearshore seawater,the value is 22.08 m.The value in coastal seawater is 11.04 m.The experimental results provide important refer-ence for the optical concealment of underwater vehicles.