结合MWD算法的低频UWB SAR运动补偿  

Motion Compensation for Low Frequency UWB SAR Based on the Modified Wavenumber Domain Algorithm

作　　者：安道祥[1] 黄晓涛[1] 周智敏[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：《电子学报》2010年第12期2839-2845,共7页Acta Electronica Sinica

基　　金：国家自然科学基金项目(No.60972121);教育部新世纪人才支持计划(No.NCET-07-0223);国防科学技术大学优秀研究生创新资助

摘　　要：波数域(WD)算法具有精确的去耦合能力,适用于大波束角低频超宽带合成孔径雷达(UWB SAR).但传统WD算法不易和运动补偿相结合,限制了该算法的应用.尤其是在无传感器数据可利用的情况下,要获得高质量机载低频UWB SAR实测图像十分困难.本文提出了一种改进WD(MWD)算法,MWD算法通过采用修正Stolt映射,实现了基于回波数据的运动参数估计和精确运动补偿.此外,文中还根据MWD算法特点,对传统运动补偿方法进行改进,提高了MWD算法对实测低频UWB SAR数据的聚焦性能.仿真实验和实测数据成像实验验证了所提方法的有效性.The wavenumber domain（WD） algorithm has the ability to handle the range-azimuth coupling correctly,which is suitable for processing the wide-beam low frequency ultra-wideband synthetic aperture radar（UWB SAR） data.But the traditional WD algorithm is difficult to integrate with motion compensation method,which limits its application.Especially,in the case of no navigational instrument data available,it is difficult to achieve high quality low frequency UWB SAR image.In this paper,a modified WD（MWD） algorithm is proposed.Based on the MWD algorithm,the parameters estimation from the raw data and the accurately motion compensation could be implemented.Moreover,some modifications were made on the traditional motion compensation method according to the characteristics of MWD,and the focusing performance of MWD algorithm on low frequency UWB SAR raw data is improved.At last,some simulation experiments and the raw data processing results demonstrated the effectiveness of the proposed algorithms.

关 键 词：合成孔径雷达 低频超宽带 MWD算法 运动补偿 

分 类 号：TN957.5[电子电信—信号与信息处理]