摘要
传统星载合成孔径雷达(SAR)受最小天线面积条件的限制,其横向分辨率与测绘带宽度相矛盾,采用编队飞行的分布式小卫星SAR体制,可解决这一矛盾,即能够同时获得大测绘带、高分辨率的地面场景的SAR图像。主要研究如何在误差环境下抑制由小天线引入的多普勒模糊的信号处理方法。该方法利用子空间投影技术对导向矢量进行精确估计,在小卫星存在基线及其他误差时仍然能够稳健地恢复高分辨的二维SAR图像。
The azimuth resolution of conventional spaceborne synthetic aperture radar （SAR） system is in conflict with swath width because of the minimum antenna area constraint. The conflict can be solved by using distributed small satellites SAR system, thus achieving a wide swath and high resolution SAR image of the observed scene. This paper mainly studies the method restraining Doppler ambiguity induced by small antenna in the condition of error. The method can recover a high resolution SAR image robustly, when baseline and other channel error exist, because steering vector is estimated accurately by sub-space projection technique.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2007年第5期1190-1194,共5页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(60472097)
