多普勒参数的精度直接影响着星载合成孔径雷达的成像质量。文中提出了一种基于分数阶傅里叶变换的星载SAR多普勒参数估计的改进方法，对多普勒中心频率和多普勒调频率在同一过程中进行估计，在提高精度的同时降低了计算复杂度。对真实Radarsat-1数据的估计结果验证了该方法的有效性。

In spaceborne Synthetic aperture radar system, the accuracy of the Doppler eentroid and Doppler rate affects the imaging quality directly. Differing from the traditional estimation method, a method for Doppler parameters estimation based on fractional Fourier transform is presented in this paper. This method estimate the Doppler centroid and Doppler rate in same process, with less computing complexity. The results of estimating the Doppler parameters of the real data of Radarsat-1 prove that this method can obtain an accurate estimation.

TN958 TN957.51

国家“863”高技术课题资助.