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对于合成孔径雷达(SAR),运动是它成像的依据,也是问题产生的根源。为了获得高的横向分辨率,要求载机沿理想航线飞行。然而,即便是装有高精度的惯导设备的SAR系统,也难以精确跟踪载机的位置,而且,成像算法的近似和空气气流的扰动更是不可避免的影响着成像质量。对于逆合成孔径雷达(ISAR),非合作目标的运动更是不可预测的,如何有效的补偿目标平动分量的影响是ISAR成像的关键。本文在此背景下主要研究了ISAR中基于回波信号的运动补偿技术。
For Synthetic Aperture Radar (SAR), motion is the basis of its imaging and is also the root cause of the problem. In order to obtain high lateral resolution, the carrier is required to fly along the ideal route. However, even a SAR system equipped with high precision inertial navigation equipment can not accurately track the position of the aircraft. Moreover, the approximation of the imaging algorithm and the perturbation of air flow inevitably affect the imaging quality. For inverse synthetic aperture radar (ISAR), non-cooperative target motion is more unpredictable. How to effectively compensate the influence of target translational component is the key of ISAR imaging. In this context, this paper focuses on the motion compensation technology based on echo signals in ISAR.