研究了基于非整数倍空域切趾滤波技术(SVA)的SAR图像增强方法,通过SVA处理可以有效抑制合成孔径雷达(SAR)图像目标副瓣,同时保持主瓣分辨率不受影响。文中针对实际SAR成像中距离及方位向非整数倍Nyquist采样问题,通过空变加权函数的调整,实现非整数倍Nyquist采样条件下基于SVA的图像增强处理。仿真及实测数据验证了非整数倍采样条件下基于空域切趾滤波技术的图像增强效果。

In this paper, a synthetic aperture radar (SAR) image enhancement method is studied based on spatially variant apodization(SVA). By SVA processing, the sidelobe can be suppressed to a low-level while maintaining the mainlobe width, that is, the resolution can be kept. To cope with the non-Nyquist sample in SAR imaging, an improved spatially weighting function is applied to SVA, which can effectively improve the image enhancement in non-Nyquist sample condition. The image enhancement results are demonstrated by simulated and the real data.

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