摘要
双基地ISAR(Bi-ISAR)成像技术在空天目标探测和识别等领域具有广阔的应用前景,然而由于双基构型的复杂多变,不同观测构型下的成像性能存在较大差异性,甚至会出现某些观测构型下的成像弧段无法进行二维成像的情况,因此快速准确地筛选出有用的Bi-ISAR成像弧段非常必要。针对空中运动目标的成像边界与成像弧段快速优选需求,该文提出了一种基于双基角一阶变化率约束的Bi-ISAR成像边界分析与快速成像弧段选取方法。首先构建了空中运动目标Bi-ISAR成像模型,推导出了与双基角一阶变换率相关的双基斜距历程表达式;然后分别从距离走动量和方位二次相位两个维度,建立了双基角一阶变化率与Bi-ISAR成像性能的理论边界,并分别给出了各自独立的成像边界约束条件;最后基于最小融合准则,给出了双基角一阶变化率约束下的Bi-ISAR成像边界,证明了基于双基角一阶变化率的边界约束等效为对Bi-ISAR成像弧段的选取,并基于仿真数据和实测数据进行了验证,仿真数据和实测数据的处理结果均验证了该文方法的有效性。
Bistatic Inverse Synthetic Aperture Radar(Bi-ISAR)imaging has a broad application in air and space target detection and recognition.However,due to the complexity and variability of the bistatic configuration,the Bi-ISAR imaging performance under different observation configurations varies greatly.There may even be imaging arcs under some observation configurations in which the two-dimensional imaging results cannot be acquired.Therefore,it is quite essential to find out the useful Bi-ISAR imaging arcs quickly and accurately.Aiming at the need of fast and optimal selection of imaging boundary and imaging arcs for aerial moving targets,a boundary analysis and fast imaging arc selection method for Bi-ISAR imaging with bistatic angle derivative constraint is proposed.Firstly,the Bi-ISAR imaging model of moving target is constructed,and the expression of bistatic slant range history related to the bistatic angle derivative is derived.Then,the boundary of the Bi-ISAR imaging performance is theoretically analyzed from the dimensions of Range Cell Migration(RCM)and Azimuth-Quadratic Phase(AQP),and the corresponding constraints are figured out.Finally,based on the minimum fusion criterion,the Bi-ISAR imaging boundary constrained by the bistatic angle derivative is presented.Moreover,it is proved that the boundary constraint of the bistatic angle derivative is equivalent to the selection of the Bi-ISAR imaging arc.The processing results of both simulation data and measured data verify the effectiveness of the proposed method.
作者
陈洪猛
华煜明
余汉晨
周锐
李响
李军
刘丹
杜鑫
CHEN Hongmeng;HUA Yuming;YU Hanchen;ZHOU Rui;LI Xiang;LI Jun;LIU Dan;DU Xin(Beijing Institute of Radio Measurement,Beijing 100854,China;Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China)
出处
《雷达学报(中英文)》
北大核心
2025年第5期1170-1195,共26页
Journal of Radars
基金
国家部委基金。
关键词
双基地逆合成孔径雷达
成像边界
成像弧段
双基角一阶变化率
快速成像弧段选取
Bistatic Inverse Synthetic Aperture Radar(Bi-ISAR)
Imaging boundary
Imaging arc
Bistatic angle derivative
Fast imaging arc selection
