滑动聚束SAR波束控制研究与设计

本文在分析聚柬SAR模式波束控制方式的基础上，指出滑动聚柬SAR控制波束始终指向远离成像区域的某个虚拟的焦点，其波束控常l方式实际上等同于聚束SAR模式的波束控制。在详细分析虚拟焦点固定的情况下，成像区域中各散射点分辨率的变化以及虚拟焦点到场景中心线的远近对分辨率的影响基础上，给出了一定分辨率下虚拟焦点到场景中心垂直距离的计算公式；然后以0．3m分辨率滑动聚柬SAR模式为例，进行了仿真计算，最后给出了0．3m滑动聚束SAR模式在运七飞机上的试验图像。

Design and Study of Beam Steering of Sliding Spotlight SAR

By analyzing beam steering of spotlight synthetic aperture radar （ SAR）, it is pointed out that beam of sliding spotlight SAR is always steered to illuminate a virtual focal point which is far away from the imaging scene, this beam steering way is equivalent to that of the spotlight SAR. To a certain virtual focal point, through analyzing resolution variation of scatter points in imaging area and impact of distance between virtual focal point and scene center to the radar resolution, a formula for computing perpendicular distance from the virtual focal point to image scene center is presented. Taking sliding spotlight SAR with resolution of O. 3m as an example, simulation computation is perfbrmed. Finally, images obtained by an airborne sliding spotlight SAR （with resolution of 0.3m） on a Yun -7 transporter are provided.