UWB SAR成像中非正交旁瓣的抑制

Non - orthogonal Sidelobes Suppression in Image Formation of UWB SAR

本文通过研究超宽带合成孔径雷达(UWB SAR)数据的二维支撑域,理论验证并分析了非正交旁瓣的存在, 给出了利用变口径加权的抑制方法,通过处理仿真数据证实了该方法的有效性。文中还阐述了二维支撑域与方位聚焦的关系,结合处理实际数据得出结论认为用中心频率确定处理角,结合变口径加权处理二维非矩形支撑是一种折中手段。

This paper mainly researches the supporting area of Ultra Wide Bandwidth SAR （UWB SAR） data. A theoretical analysis of the formation of non - orthogonal sidelobes is given. The weighting function with variable length can be employed to give a suppression of non-orthogonal sidelobes, and the effectiveness of this method has been validated with simulated data. In the paper, we discuss the relationship between the 2D supporting area and focusing in azimuth. A conclusion, which the variable weighting function splits the difference in dealing with the supporting area, has been made in UWB SAR row data processing.