有孤立源存在时ISAR成像运动补偿

The Motion Compensation in ISAR Imaging for an Isolated Scatterer

当目标中存在一相对孤立点且具有较强反射的小散射源时,ISAR运动补偿问题转化为对各次回波信号进行距离对准并用回波相位对各次回波进行相位补偿的问题.在此用回波相位近似估计回波多卜勒频率,并提出了一种新的多卜勒频率去模糊方法,用去模糊的多卜勒频率重建目标运动轨迹,对各次回波进行距离对准。

When a small scatterer which is relatively isolated and strong can be found in the imaging target, the motion compensation in ISAR imaging can be transfered into two steps: the range alignment for each return and the phase compensation of each return with the phases of the isolated scatterer. In this paper, we estimate the return Doppler frequencies from the return phases and propose a new way to resolve the Doppler ambiguities. Then the unambiguous Doppler frequencies are used to reconstruct the target trajectory so as to conduct range alignment for each return.