地球同步轨道SAR“凝视”成像波束指向控制分析  

Analysis of Staring Geosynchronous Synthetic Aperture Radar Antenna Beam Pointing Steering

作　　者：黄颜颜[1,2,3] 胡文龙[1,2] 江冕[1,2,3] 朱雪莹[1,2,3] 张浩龙[1,2,3] 

机构地区：[1]中国科学院空间信息处理与应用系统技术重点实验室,北京100190 [2]中国科学院电子学研究所,北京100190 [3]中国科学院大学,北京100190

出　　处：《科学技术与工程》2014年第23期66-72,共7页Science Technology and Engineering

摘　　要：针对地球同步轨道星载合成孔径雷达(geosynchronous synthetic aperture radar,GEOSAR)"凝视"成像,分析其天线波束指向控制需求,定义天线波束二维指向角,提出天线波束二维步进式指向控制及同步与非同步控制方法,是一种有效地实现GEOSAR天线波束控制的方法。应用成对回波理论分析天线波束二维指向控制对回波信号的影响,波束指向被控造成回波方位向信号的幅度调制,引起成对回波,定量分析波束指向控制步长与成对回波幅度和位置之间的关系,提出成对回波性能指标,为GEOSAR"凝视"天线波束指向控制步长的合理设计提供了依据。最后通过计算机仿真验证了理论分析的正确性。An antenna beam pointing model of two-dimensional is founded and a new model of step-by-step antenna beam scan steering of two-dimensional is proposed for space-borne GEOSAR staring working mode. Based on modulation law, the mathematics and simulation analysis confirm that beam steering results in echo amplitude being modulated and caused infinite pairs of echoes for azimuth signal, so beam steering would deteriorate echo quality. Be- sides, the relationship between beam stepped steering time and position of paired echoes is quantitatively described. At last, the performance of paired echoes is presented. The foundation of steering step of GEOSAR is given in this paper. Finally, point target simulation was given and simulation result shows the validity of theoretical analysis.

关 键 词：地球同步轨道SAR 波束指向 波束指向控制 成对回波 

分 类 号：TN957[电子电信—信号与信息处理]