基于地理坐标系的电磁环境快速仿真与体绘制

Rapid Simulation and Volume Rendering of Electromagnetic Environment Based on Geographic Coordinate System

为有效考虑地球曲率的影响,采用球形规则网格模型组织电磁场数据。针对ITM(Irregular Terrain Model)模型计算量大的问题,提出一种地形重用方法提高仿真效率。针对多辐射源计算问题,将多线程计算和地形重用方法相结合,提高仿真效率。针对传统光线投射算法使用立方体作为包围盒,不能直接绘制球形规则网格数据问题,提出一种使用圆顶体作为包围盒的光线投射算法。经实验验证,考虑地形影响仍然能够获得较高的计算效率,满足多辐射源电磁环境仿真的需要,且圆顶体包围盒使光线投射算法的应用范围更加广泛。

Considering the earth’s curvature,the spherical regular grid model is used to organize the electromagnetic field data.In order to reduce computational complexity of ITM model,the terrain reuse is proposed to improve the efficiency of the simulation.The Multithread and the terrain reuse are combined to improve the efficiency of the multi-radiation source.Considering that the traditional ray casting algorithm which takes the cube model as the bounding box cannot draw spherical regular grid data directly,a ray casting algorithm which uses the dome model as the bounding box is proposed.Experiments show that even considering the influence of terrain,the algorithm still can get high computational efficiency and satisfy the needs of electromagnetic simulation of multi-radiation source.Taking the bounding box of dome as the model,the ray casting algorithm will be applicated widely.