机载SAR海面舰船成像多普勒参数估计

On estimation of ship’s Doppler parameters in ocean SAR imaging process

本文详细分析舰船运动对SAR成像的影响,对运动引起的二次相位误差应用分块对比度最优自聚焦算法进行补偿;对运动引起的一次相位误差利用估计多普勒中心频率的方法进行估计;文中提出的多普勒中心频率估计方法在图像域进行,给出该方法严格的公式证明和算法流程。最后对实际机载SAR海面数据进行处理和分析,结果验证了该方法的有效性。

Based on the analysis of airborne SAR imaging process and result of ships on ocean surface, contrast optimum auto focus algorithm is applied to estimate ship＇ s Doppler chip rate. A new approach to estimate ship＇ s Doppler center frequency was proposed which deals with image data after auto focus imaging. The strict formula derivation and algorithm flow of this approach was given in this paper. Finally the validity of this method was demonstrated by experiments for real SAR resource data on ocean surface.