基于三角面元波面分割的海面红外成像仿真

从海面小波面法线出发,采用海浪谱模型模拟海面的形态,提出一种新的简便算法,将海面各小波面划分成三角面元,通过求三角面元的法向量来计算海面发射率,大大降低了计算的难度。其次,综合考虑海面自身热辐射及海面反射天空、太阳辐射和探测器与海面之间的大气路径光谱辐射,建立海面红外辐射模型。最后,生成海面红外辐射的灰度图像,并给出在不同探测器天顶角下的仿真结果。通过结果分析,该方法可以有效地模拟海面红外辐射特性,仿真的红外图像对于舰船红外仿真研究及红外探测具有重要意义。

Simulation of the infrared image of sea surface based on the triangular facet of surface segmentation

Starting from the normal vector of wavelet planes of the sea surface,the morphology of sea surface was simulated by the ocean wave spectrum model. A new and simple algorithm was put forward,each wavelet plane of sea surface is divided into two triangular facets,and the normal vector of triangular facet is determined to calculate the emissivity of sea surface,which can greatly reduce the computation difficulty. Then,considering the thermal self-radiation of sea surface,the radiation that the sea surface reflects the sky and the sun,and the atmospheric path radiation between the sensor and the sea surface,the infrared radiation model of sea surface was established. Finally,the gray image of the infrared radiation of sea surface was generated,and the simulation results are given under the different zenith angles. The simulation results show that the method can effectively simulate the infrared radiation characteristics of sea surface,and the simulated infrared images are very important for ship infrared image simulation and infrared detection.