Within the paper the applicability of modern graphics cards for SAR simulation is dem-onstrated. By these means SAR simulation, which is frequently used as a key tool for the analysis and interpretation of SAR scenes, is feasible in real-time even in complex urban environments. The geometric models of urban areas, which are required as data-base for SAR simulation, are frequently used for real-time visualizations of virtual scenes. Similar to such applications, SAR geometry can be implemented within stan-dard graphics hardware, which offers 3D hardware acceleration and programmable graphics processing units (GPU). Thus, real-time SAR simulation can be realized using of-the-shelf hardware components.