Ray-Tracing Simulation Techniques for Understanding High-Resolution SAR Images
Ray-Tracing Simulation Techniques for Understanding High-Resolution SAR Images
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DOI：
10.1109/tgrs.2009.2029339
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发表时间：
2010-03-01
影响因子：
8.2
通讯作者：
Bamler, Richard
中科院分区：
文献类型：
--
作者：
Auer, Stefan;Hinz, Stefan;Bamler, Richard
本文提出了一种基于光线追踪的合成孔径雷达（SAR）反射率图生成仿真概念。人造物体的三维模型由虚拟SAR传感器照射，该传感器的信号由通过模型空间发送的射线近似。为此，对开源软件工具进行了调整和扩展，以导出SAR几何形状的输出数据，然后创建反射率图。光线可以在物体场景中进行多次反射。具有不同多重反射电平的信号存储在单独的图像层中。为了评估模拟方法的潜力和局限性，模拟的反射率图和分布图与真实的TerraSAR-X图像进行了比较，用于各种复杂的人造物体，如东京的摩天大楼、拉斯维加斯的永利酒店和巴黎的埃菲尔铁塔。结果表明，仿真结果可以为复杂SAR图像的解译或预测计划SAR图像获取的反射率提供非常有价值的信息。
In this paper, a simulation concept is presented for creating synthetic aperture radar (SAR) reflectivitymaps based on ray tracing. Three-dimensional models of man-made objects are illuminated by a virtual SAR sensor whose signal is approximated by rays sent through the model space. To this end, open-source software tools are adapted and extended to derive output data in SAR geometry followed by creating the reflectivity map. Rays can be followed for multiple reflections within the object scene. Signals having different multiple reflection levels are stored in separate image layers. For evaluating the potentials and limits of the simulation approach, simulated reflectivitymaps and distribution maps are compared with real TerraSAR-X images for various complex man-made objects like a skyscraper in Tokyo, the Wynn Hotel in Las Vegas, and the Eiffel Tower in Paris. The results show that the simulation can provide very valuable information to interpret complex SAR images or to predict the reflectivity of planned SAR image acquisitions.