基于时频分布的SAR相位误差估计方法  

New method for phase errors estimation based on the time-frequency distribution

作　　者：赵侠[1] 

机构地区：[1]国防科技大学理学院数学与系统科学系,湖南长沙410073

出　　处：《红外与激光工程》2008年第S2期769-773,共5页Infrared and Laser Engineering

基　　金：国防科技大学预研项目(JC0702005);国家自然科学基金资助项目(60572136)

摘　　要：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...

关 键 词：SAR 时频分布 相位误差估计 

分 类 号：TN958[电子电信—信号与信息处理]