提出了一种新的基于时频分布的相位误差估计方法。相位误差的存在严重影响着合成孔径雷达(SAR)成像的质量,综合利用信号的不同时频分布的互补优势,获取具有强健于噪声且具有较高时频分辨率的时频分布图,在此基础上,利用曲线拟合获得瞬时频率进而获得相位误差的较高精度估计。实验结果表明,该方法简单易行,且具有较好的相位误差估计效果。
A new method for phase error estimation is presented based on the time-frequency distribution. Phase error badly degrades the quality of SAR image. By synthesizing the advantages of various time-frequency distributions, a new time-frequency representation is obtained, which has higher time-frequency resolution and is robust to the noise. Then a better instantaneous frequency estimation and phase error estimation is gained. Experimental results demonstrate that our method is easy to use and has preferable ph...