提出了一种基于ECS PGA的高精度机载SAR运动补偿算法。该算法利用ECS算法来实现成像处理,利用PGA算法实现相位误差估计与补偿。由于ECS算法利用部分孔径数据进行成像,不仅能够减小运动误差的影响,并且可以有效地减小数据处理的运算量。而PGA处理则进一步补偿了剩余的相位误差,实现精确聚焦。通过对真实的机载SAR数据的处理结果验证了文中提出的运动补偿算法的有效性。

A motion compensation algorithm based on ECS PGA is presented in this paper.This algorithm uses ECS(Extend Chirp Scaling) algorithm for sub-aperture data imaging,used PGA(Phase Gradient Algorithm) algorithm for compensating the phase error.Sub-aperture data not only can reduce the influence of platform's motion,but also reduce the computing amount.PGA algorithm could be used for compensation of the residual phase error.The raw data imaging result shows that ECS PGA is an effectively algorithm for airborne SAR motion compensation.

TN958