三维图形绘制生成航海雷达回波的强度仿真

On Simulating Marine Radar Echo Intensity Generated by 3D Graphic Rendering

现有航海雷达模拟器的回波图像对物标间的遮挡判断不明确,回波强度不能有效反映电磁波传播的物理特性。在分析射线跟踪方法的基础上,提出了以三维视景库为数据源,通过视景图形绘制方法生成航海雷达图像。提出了基于雷达方程的航海雷达回波强度计算模型,以ITU建议标准为参考计算模型中的大气传播损耗、降雨损耗和云雾损耗,结合图形绘制流水线实现回波强度计算。仿真试验证明该方法生成的航海雷达图像物标遮挡关系明确,回波强度变化合理,真实感明显提高。

The echo image cannot show reliable occlusion between objects, and the echo intensity cannot represent physical characteristics of electromagnetic wave propagation in the existing marine radar simulator. To solve these problems, a new method of generating radar echo image was raised on the basis analyzing the method of ray tracing. 3D visual database was used as data source, the marine radar echo image was generated by the method scene graphic rendering. A model based on radar equation was raised to compute marine radar echo intensity. The model gave the method of computing path attenuation, rain attenuation and attenuation due to cloud and fog based on ITU recommended standard. The generated echo image raised method was realized in programmable graphic pipeline. Simulation results show that the echo image object occlusion relation is clear, the echo intensity change is reasonable, and the echo reality is obviously improved.