CAJ | 학술논문

在IS A R成像处理中 ,目标整体在距离方向的位移会使散射点的回波无法落在相同的距离单元内 ,造成成像结果的散焦 ,因此采用包络对齐的方法对该位移进行补偿.然而在W波段的IS A R包络对齐处理过程中 ,较高的分辨率会使回波包络在成像时间内发生变化 ,导致传统方法产生对齐误差.针对该问题 ,提出了一种使用Keystone变换进行包络规整的方法来提高包络对齐的准确度.在Keystone变换之前 ,使用了目标重心跟踪及补偿的方法来实现回波信号的相干化.实验结果表明 ,通过包络规整处理 ,成像结果的极值点强度 ,图像熵以及图像对比度都得到了较大的提升.
재IS A R성상처리중 ,목표정체재거리방향적위이회사산사점적회파무법락재상동적거리단원내 ,조성성상결과적산초 ,인차채용포락대제적방법대해위이진행보상.연이재W파단적IS A R포락대제처리과정중 ,교고적분변솔회사회파포락재성상시간내발생변화 ,도치전통방법산생대제오차.침대해문제 ,제출료일충사용Keystone변환진행포락규정적방법래제고포락대제적준학도.재Keystone변환지전 ,사용료목표중심근종급보상적방법래실현회파신호적상간화.실험결과표명 ,통과포락규정처리 ,성상결과적겁치점강도 ,도상적이급도상대비도도득도료교대적제승.
The movement of target in range direction will make the echo of scatters shift from range cell ,and this willcause blur in ISAR imaging process .Thus ,the envelop alignment is used to compensate this shift .However ,the highresolution in W-Band ISAR will cause the envelop to change its shape during the imaging period .This will cause error intraditional envelop alignment methods .Therefore ,a new envelope regular method based on Keystone transform is proposedto increase the accuracy of envelop alignment .Before the Keystone transform ,a target center track method is usedto make the return signal coherent .The simulation results show that the peak value ,entropy and contrast of image areimproved by applying this method .