一种改善交叉极化距离模糊度的新工作模式  

A new working mode to improve the cross-polarization range ambiguity to signal ratio

作　　者：陈祺[1] 黄海风[1] 余安喜[1] 梁甸农[1] 何峰[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《电波科学学报》2013年第6期1082-1087,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(No.61002031);上海航天科技创新基金项目(No.SAST201324)

摘　　要：距离模糊度是星载合成孔径雷达(Synthetic Aperture Radar,SAR)系统设计考虑的重要指标.传统交替发射的全极化星载SAR系统中,受同极化模糊的影响,交叉极化距离模糊度会不同程度地恶化.针对这一问题,提出了全极化渐进扫描合成孔径雷达(Terrain Observation by Progressive Scans,TOPSAR)工作模式以改善星载全极化SAR系统的交叉极化距离模糊度.按Radarsat-2近似的参数设计对比了两种全极化方案,仿真结果说明了全极化TOPSAR系统可以防止同极化模糊对交叉极化信号的影响,有效改善星载全极化SAR的交叉极化模糊度性能.Range ambiguity to signal ratio （RASR） is a crucial index of spaceborne synthetic aperture radar （SAR） system. The cross-polarization RASR performance is deteriorated because the cross-polarization signal is interrupted by the co-polarization ambiguities in the traditional full-polarization SAR systems. A new working mode, full-polarization terrain observation by progressive scans （TOPSAR）, is presented to improve the cross-polarization RASR performance of the full-polarization spaceborne SAR system. With the Radarsat-2 like parameters, a full-polarization TOPSAR system and a traditional full-polarization SAR system are designed and their RASR performance are compared. The simulation results show that the proposed full-polarization TOPSAR mode can avoid the interrupt from co-polarization ambiguities to the cross-polarization signal, and it can efficiently improve the cross-polarization RASR performance of the full-polarization spaceborne SAR system.

关 键 词：合成孔径雷达 渐进扫描合成孔径雷达 交叉极化 距离模糊度 

分 类 号：TN957[电子电信—信号与信息处理]