月面态势感知雷达三维成像方法

3-D Imaging Method for Lunar Surface Perception Radar

为实现月球探测器软着陆前在悬停状态下对局部月面起伏态势的有效感知,提出一种基于高度维宽带高分辨以及平面二维接收数字波束形成的雷达三维成像方法.该方法的突出特点是不需要雷达与目标间的相对运动便能实现三维成像.根据成像原理,对雷达发射波形、天线形式及尺寸进行了研究和设计;探讨了成像高度以及场景栅格扫描时的波位步进量问题;给出完整的成像处理流程并进行仿真验证.仿真结果表明,采用该方法可以获得强散射中心三维坐标,重构出场景区域的三维图像.

To realize perception of local lunar surface under the condition of relative stationary before soft landing during moon discovery, a novel 3-D imaging method is proposed. The method is based on range high-resolution in altitude dimensional and 2-D receiving digital beam forming to radar scene floor. The outstanding feature is this method can realize 3-D imaging without relative motion between radar and target. According to imaging principle, the transmitting waveforms, antenna shape and size has been researched and designed; the choosing of imaging height and stepping size for scene scan were also discussed; the whole imaging processing flow was given and has been simulated using computer. Simulation results indicate that it can obtain 3D coordinates of strong scattering centers accurately and reconstruct 3-D image of scene successfully.