基于脉冲积累的SAR实时聚焦算法

An improved focusing method for real time SAR

在实际的SAR场景中,由于载机平台运动的不规律会引入相位误差,这将导致SAR图像出现模糊,甚至不能形成图像,因此需要准确地估计和补偿相位误差.提出一种较好的SAR相位历史估计算法,在方位向应用延时自相关方法进行准确的相位估计,由此实现SAR的准确聚焦成像.该相位估计方法具有较高的计算效率,非常适合于实时SAR系统.利用对实际SAR数据的聚焦处理证明了该方法的有效性.

For practical SAR systems,the motion errors of radar platform lead to the azimuth phase history errors which lead to defocus images.We propose a modified autofocus method which applies the delay and remove algorithm for more effectively estimating the real phase history based on azimuth data.With this method a better focused image is achieved.The algorithm is efficient for real-time SAR system.The focus processing results of SAR measured data show that the proposed method is effective.