阿基米德螺旋天线的群延迟和UWB-SAR系统延迟的补偿研究  

Compensation of Archimedean-spiral Antenna Group Delay and UWB-SAR System Delay

作　　者：王建[1] 周智敏[1] 宋千[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2008年第1期57-62,共6页Journal of National University of Defense Technology

摘　　要：将Archimedean天线的群延迟分为色散部分和非色散部分。利用Archimedean螺旋线的几何特性揭示了其固有的色散特性,有效地解决了该类天线群延迟未知情况下的补偿问题;将天线群延迟的非色散部分等效为附加系统延迟,利用定标体形成的曲线特征,提出了一种基于Hough变换(HT)的延迟系统估计方法,并利用曲线的对称性降低HT的维数,提高估计速度。轨道超宽带SAR数据的处理结果验证了所提方法的有效性。The group delay of the Arclfimedean-spiral antenna was cataloged into the dispersion part and the constant part. Then a geometrical analysis was used to reveal the inherent dispersion property of the antenna＇ s group delay. As a result, it effectively compensated the unknown antenna with its geometry measured. The constant group delay of the antenna was added into the system delay as a whole, and the whole delay was estimated through the Hough transformation of the hyperbola of a calibration marker （e. g. trihedral）, as one of the curve parameters is the system delay. By an estimation of the azimuth location of the nadir of the curve using its symmetrical property, the dimension of the Hough transformation is further eliminated, so the method is efficient. Rail Ultra Wide Band SAR （UWB-SAR） data processing result verified the compensation method.

关 键 词：阿基米德螺旋天线 色散补偿 超宽带SAR HOUGH变换 

分 类 号：TN958[电子电信—信号与信息处理]