CAJ | 학술논문

针对多输入多输出逆合成孔径雷达(MIMO-ISAR)成像中空-时阵列非均匀造成的成像数据不均匀，该文基于线阵建立了目标空-时回波信号模型，经过推导，提出一种相同距离单元横向聚焦的成像方法。该方法首先进行距离补偿，将空时分布的距离像对齐至目标初始位置；然后构建相位因子，补偿非关心方向运动引起的相位变化；最后对相同距离单元数据沿横向相干叠加，实现横向聚焦。该算法不受阵列形式的限制，无需数据均匀化处理，而且能够横向定标，仿真验证了该方法的有效性。
침대다수입다수출역합성공경뢰체(MIMO-ISAR)성상중공-시진렬비균균조성적성상수거불균균，해문기우선진건립료목표공-시회파신호모형，경과추도，제출일충상동거리단원횡향취초적성상방법。해방법수선진행거리보상，장공시분포적거리상대제지목표초시위치；연후구건상위인자，보상비관심방향운동인기적상위변화；최후대상동거리단원수거연횡향상간첩가，실현횡향취초。해산법불수진렬형식적한제，무수수거균균화처리，이차능구횡향정표，방진험증료해방법적유효성。
In view of the uneven imaging data caused by the uneven space-time array in the MIMO-ISAR imaging, the echo signal model of a target is established based on a linear array, an imaging algorithm that focuses on the cross-range direction following range unit is proposed. The range compensation is applied firstly, which can make range profiles that distribute in the space-time domain align at the initial position of target. Then phase changes caused by motion in unconcerned direction are compensated. Finally, the range profiles are focused in the cross-range direction following range unit bycoherent addition. The algorithm is not restricted by the structure of the array and the processing of uniformity is not needed. In addition, it can determine the ISAR image scale in the cross-range direction. The simulation results verify the validity of the proposed algorithm.