CAJ | 학술논문

层析成像合成孔径雷达三维层析成像实现三维层析成像算法简单、计算量小，但该算法主要适用于远场情况；并且，靠增加基线数提高分辨率的办法也会大大增加系统复杂度。针对上述问题提出一种基于近场圆周扫描的共焦层析成像诊断方案，结合合成孔径与共焦层析成像思想，通过修改映射关系，将用于二维成像中基于部分圆周扫描的滤波逆投影算法扩展到共焦层析成像中，在不同的目标高度层聚焦，完成空时共焦成像。计算机仿真和实验室测试结果均表明该方案可以克服高度模糊，从三维目标场景中提取三维信息，完成准三维成像重建。
층석성상합성공경뢰체삼유층석성상실현삼유층석성상산법간단、계산량소，단해산법주요괄용우원장정황；병차，고증가기선수제고분변솔적판법야회대대증가계통복잡도。침대상술문제제출일충기우근장원주소묘적공초층석성상진단방안，결합합성공경여공초층석성상사상，통과수개영사관계，장용우이유성상중기우부분원주소묘적려파역투영산법확전도공초층석성상중，재불동적목표고도층취초，완성공시공초성상。계산궤방진화실험실측시결과균표명해방안가이극복고도모호，종삼유목표장경중제취삼유신식，완성준삼유성상중건。
Tomography imaging of synthetic aperture radar can realize 3D tomography although its algorithm is simple,computation quantity is small,but is mainly suitable for the far field conditions. In addition,by increasing the number of baseline to improve the resolution will greatly increase the system complexity. According to the above problems,a tomography imaging technique in near-field using confocal circular SAR which on a Partial-circle or curved orbit is proposed. Two techniques of synthetic aperture and confocal imaging are combined to achieve space-time. Namely,confocal filtered back-projection of circle algorithm which usually used in two-dimensional imaging is extensively applied in confocal imaging. The results of digital simulation and experiment show that the proposed algorithm overcomes altitude ambiguity and has the capability to extract quasi-3D imaging information from a target scene.