在分析聚束合成孔径雷达（SAR）方位向时频关系的基础上，提出了一种新的全孔径分辨率SAR成像算法。根据SAR在条带与聚束模式下回波信号之间的差别，利用现有成熟的条带SAR成像算法实现先对聚束SAR各方位向子孔径成像，而后再将各方位子孔径带宽合成为全孔径带宽，以形成具有全孔径分辨率的SAR图像，极大降低了系统PRF的要求。

In this paper, basing on analyzing the time-frequency relationship in azimuth of Spotlight SAR, and according to the difference of the signals of spotlight SAR and strip SAR, a new method which can realize the imaging of spotlight SAR by utilizing the squint mode imaging method of strip SAR is proposed. The azimuth signal of a sub-aperture can be regarded as a sub - band of the full aperture. After imaging the spotlight SAR signal using the imaging method for squint mode strip SAR, the sub-apertures are combined. The having full aperture resolution image is recovered and the azimuth resolution is improved.

TN957.52 TN958