摘要
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.
出处
《现代雷达》
CSCD
北大核心
2007年第6期46-50,共5页
Modern Radar
关键词
聚束式SAR成像
子孔径合成
频带拼接
spotlight SAR imaging
sub-aperture synthesis
band combination
