雷达学报Issue(1)：70-77,8.DOI:10.12000/JR14149
捷变PRF技术在斜视聚束SAR中的应用
The Application of PRF Variation to Squint Spotlight SAR
摘要
Abstract
This paper focuses on a novel squint spotlight SAR mode, where the PRI variation is employed to increase the range swath width, especially for high-resolution imaging. The spotlight SAR is developed to increase the azimuth resolution via steering the antenna beam to always illuminate the same area on the ground during the whole data acquisition interval. However, requirement of high resolution and large squint angle leads to large Range Cell Migration (RCM). Therefore, to ensure the scattered echoes along the azimuth to be completely received within the fixed reception window, the range swath has to be much narrower than the reception window. In order to increase the range swath, we can change the PRI along the azimuth to shift the reception window according to the variation of instantaneous slant range. This paper first derives the PRI variation scheme. Afterward, a modified time-domain Back-Projection Algorithm (BPA) is presented to implement the focusing. Finally, simulation results are given to validate the presented SAR mode and corresponding imaging processor.关键词
合成孔径雷达(SAR)/斜视聚束/捷变PRF/高分辨率/后向投影算法(BPA)Key words
Synthetic Aperture Radar (SAR)/Squint spotlight/High-resolution/PRF variation/Back-Projection Algorithm (BPA)分类
信息技术与安全科学引用本文复制引用
罗绣莲,徐伟,郭磊..捷变PRF技术在斜视聚束SAR中的应用[J].雷达学报,2015,(1):70-77,8.基金项目
自然科学基金青年基金(61401431)资助课题 （61401431）
