一种基于局部频率估计的地形自适应干涉图滤波器  

A Topography Adaptive Interferogram Filter Based on Local Frequency Estimation

作　　者：朱岱寅[1] 朱兆达[1] 谢求成[1] 

机构地区：[1]南京航空航天大学电子工程系,江苏南京210016

出　　处：《电子学报》2002年第12期1853-1856,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60082002)

摘　　要：本文提出一种用于InSAR处理的地形自适应干涉图滤波器.该滤波器通过局部空间频率估计,依据地形的变化进行参数调整,能够有效地克服传统的多视滤波器破坏致密干涉条纹的缺点.本文详细描述该地形自适应滤波器的结构,并阐述其具体实现方法.在局部频率估计中,由于采用了二维Chirp-Z变换,滤波器的计算效率较高.用X-SAR的干涉数据对所提出的自适应滤波器进行了验证,给出了自适应滤波器和传统多视滤波器的滤波结果,说明前者具有保持干涉条纹的良好特性.In this paper, an efficient implementation of the topography adaptive filter based on local frequency estimation is proposed. This filter tunes its central frequency according to the local topography to preserve the tight fringes of the interferometric phase map as well as reduce the phase noise. We describe the structure and the implementation of this topography adaptive filter in detail. The 2D chirp-Z transform is applied to improve the efficiency and accuracy of the frequency estimation. X-SAR data of Mt. Etna is employed to show the effectiveness of this filter in comparison with the traditional multilook filter in term of fringe preservation.

关 键 词：局部频率估计 地形自适应干涉图滤波器 干涉SAR CHIRP-Z变换 相干性估计 合成孔径雷达 

分 类 号：TN958[电子电信—信号与信息处理] TN713[电子电信—信息与通信工程]