卫星滚动角误差对星载SAR距离向DBF影响  

Effect of Satellite Roll Error on Space-borne SAR Elevation DBF

作　　者：齐维孔[1,2] 禹卫东[1] 黄平平[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《系统仿真学报》2010年第7期1697-1701,共5页Journal of System Simulation

摘　　要：在研究星载SAR距离向数字波束形成实现宽测绘带原理的基础上,分析卫星滚动角误差对星载SAR宽测绘带距离模糊的影响,主要是天线波束中心在距离向移动造成的,并使用零陷展宽技术展宽距离向天线方向图零陷宽度,有效地减弱卫星滚动角误差带来的影响,从而减小距离模糊,提高宽测绘带的成像质量。仿真结果表明了分析的正确性。The influence of satellite rolling error to range ambiguity of space-borne SAR wide swath,which was mainly caused by the motion of antenna beam centre in elevation,was analyzed through investigating the principle of the space-borne SAR elevation digital beam-forming.Then the null width of range patter was widened by the technique of broad null to reduce the influence of satellite rolling error effectively.Moreover,the method helps to reduce range ambiguity and improve the image quality of wide swath.Simulation results confirm the validity of the analysis.

关 键 词：星载合成孔径雷达 数字波束形成 宽测绘带 距离模糊 卫星滚动角 

分 类 号：TN958[电子电信—信号与信息处理]