关于圆周合成孔径雷达目标成像质量优化仿真

摘要

为了合成孔径雷达能够360°全方位获取信息实现三维成像,针对调频连续波圆周合成孔径雷达(Frequency Modulation Continue Wave Circular Synthetic Aperture Radar,FMCW CSAR)特殊的圆对称谱,普通加窗处理后对圆环对称谱展宽了主瓣宽度且旁瓣未有明显抑制的问题,提出了利用空间变迹法(Spatially Variant Apodization,SVA)不断调整窗函数系数,使其自动适应信息的需要,最终达到在保持主瓣宽度不变的情况下压低旁瓣的效果,进一步提高成像分辨率.最后将改进后的算法与加窗方法做了对比仿真处理,通过仿真证明,上述算法能够有效抑制圆周合成孔径雷达成像的旁瓣.%In order to improve the target imaging quality for special circular symmetry spectrum of Frequency Modulation Continue Wave Circular Synthetic Aperture Radar (FMCW CSAR),an optimization algorithm is put forward by using SVA (Spatially Variant Apodization) to adjust window function.This algorithm achieves the effect of sidelobe suppression when the main-lobe width is unchanged,which improves the imaging resolution.Finally,the proposed algorithm is simulated and compared with the traditional windowing algorithm.Simulation results show that the proposed algorithm can effectively restrain the sidelobe of circular synthetic aperture radar.