基于Spectral—Fit法的星载SAR方位多波束方位向非均匀采样的处理

介绍了方位多波束技术的基本原理，指出了其在星载情况下必然会产生方位向非均匀采样，而非均匀采样会在雷达图像中产生虚假目标。Spectral—Fit法的目的是从原始信号的非均匀样本中得到该信号的真实频谱，为了消除方位向非均匀采样的影响，文中将Spectral—Fit法与方位多波束SAR的成像算法结合，对方位向非均匀采样的目标回波信号进行处理。最后通过计算机仿真验证了该处理的有效性。

Processing of Nonuniform Azimuth Sampling Spaceborne SAR MAB Based on Spectral-Fit Method

The principle of Multiple Azimuth Beams(MAB) SAR is described briefly in this paper. It is indicated that the technique necessarily result in nonuniform azimuth sampling in spaceborne SAR. The Spectral-Fit method is applied in recovering the real spectrum of the original signal from its nonuniform samples. To eliminate the effects of nonuniform azimuth sampling, the Spectral-Fit method is combined with imaging algorithm to deal with the echo signal that is nonuniformly sampled in the azimuth. Finally the processing is proved to be correct by the computer simulation.