中文摘要：

低飞平台大斜视合成孔径雷达（SAR）高度低，对脉冲重复频率要求高，斜视角大，导致多普勒中心远离零点，基于传统成像方法面临严重散焦的问题。针对低飞平台大斜视SAR成像问题，建立了脉冲重复频率与斜视角之间关系模型。从避免距离模糊、方位模糊、回避发射波干扰等出发，以实现高分辨率成像为目的，合理设计脉）中重复频率，解决了成像中散焦问题。基于循环算法优化Golomb序列，并利用信号良好自相关性获得高的距离向分辨率。基于STOLT插值，利用ω-k成像算法处理原始数据，得到了良好成像效果。仿真证明该算法可有效解决大斜视平台SAR成像问题。

英文摘要：

Higher requirement of pulse repetition frequency will be faced when synthetic aperture radar （SAR） is at a very low height. Doppler centroid will deviate from zero when the squint angle is too large, resulting in defocusing the final image. For imaging of low-height and squint-looking SAR, a pulse repeti- tion frequency is designed properly in order to get a high resolution image and avoid the range and azi- muth ambiguities and the interference of the transmitted pulses, and the problem of overlaying the azi- muth spectrais solved. Golomb sequence is optimized with cyclic algorithm, and a good autocorrelation is used to get high range resolution. After STOLT interpolation mapping, the raw data is properly processed using to-k algorithm to get agood imaging result. Simulation results show that the algorithm can solve the problem of low height and large squint SARimaging.