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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 of the existing navigation radar simulator is not clear for determining the occlusion between objects and the echo intensity can not effectively reflect the physical characteristics of the electromagnetic wave propagation. Based on the analysis of the ray tracing method, a three-dimensional visual database is proposed as a data source, and a nautical radar image is generated by the visual graphics rendering method. Proposes a calculation model of marine radar echoes based on radar equation. Calculate the return wave intensity, rainfall loss and cloud loss with reference to the ITU Recommendation, and calculate the echo intensity by combining the graphics rendering pipeline. Simulation results show that the method of the formation of the marine radar image object obscuring a clear relationship between the echo intensity changes reasonable, real sense improved significantly.