基于变迹滤波的SAR图像旁瓣抑制技术

Sidelobe Suppression Technique in SAR Imaging Using Apodization

合成孔径雷达(SAR)图像的旁瓣效应会影响图像的分辨率以及动态范围,现有的旁瓣抑制技术为加窗处理,这会使得主瓣展宽从而降低图像分辨率。为此,在采用变迹滤波方法进行图像旁瓣抑制的基础上,对非整数倍奈奎斯特采样下的变迹滤波算法进行了改进。仿真结果和实测数据处理结果证明,改进的方法在非整型奈奎斯特采样时,可以保证图像主瓣不展宽的同时较好地抑制旁瓣,提高图像分辨率和动态范围。

The sidelobe effect of synthetic aperture radar(SAR)image affects the resolution and dynamic range of the image.Classical windowing technique can cause the mainlobe broadening and reduce the image resolution.For this reason,the apodization filtering technique is used to suppress the sidelobe of the image,noninteger Nyquist sidelobe apodization filtering method is improved.Simulation results and measured data processing results show that the proposed method can well suppressed the sidelobes and improve the resolution and dynamic range of the image.