在毫米波高分辨合成孔径雷达成像中,当前斜视合成孔径雷达垂直航向运动补偿方法在处理过程中引入的相位误差大于π/4,这会降低补偿的效果.可对含有运动误差的斜距表达式进行变形,把斜视斜距等效为正侧视模式时的斜距,把垂直航向运动误差进行等效与分解,再采用正侧视垂直航向运动补偿方法进行垂直航向运动补偿.斜视角在10°以内,该方法对毫米波实测数据成像补偿效果较好,同等斜视角下补偿结果优于已有方法补偿效果.
In millimeter wave high resolution SAR imaging, the existing squint SAR cross-track motion compensation algorithm brings into a phase error of more than π/4 during the imaging process. The phase error would worsen the compensation effect. This paper transforms the squint slant range with the motion error into the side-looking slant range. We adopt the side-looking cross-track motion compensation algorithm to cross-track motion compensation. The proposed algorithm works well on the millimeter wave real data in the 10° squint angle and the results are better than those obtained by existing algorithms in the same squint angle.