摘要
The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors,and can produce very consistent results for interferograms generated under a wide variety of multilook factors and with very different noise level.However,the filter is a bit complicated and its application is still very limited.We present the designing and implementation of the variance-dependent Goldstein radar interferogram filtering,emphasizing on the logic flow,the generation of look-up table,the determination of filtering parameter,and the handling of edge information loss.Experiments with real interferograms are provided to demonstrate the applications of the designed filtering.Comparisons with the result of the coherence-dependent Goldstein filter show that improvements from 18.4% to 36.9% are achieved when the variance-dependent filter is used,and the noisier the interferogram,the greater the improvement.
The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors, and can produce very consistent results for interferograms generated under a wide variety of multilook factors and with very different noise level. However, the filter is a bit complicated and its application is still very limited. We present the designing and implementation of the variance-dependent Goldstein radar interferogram filtering, emphasizing on the logic flow, the generation of look-up table, the determination of filtering parameter, and the handling of edge information loss. Experiments with real interferograms are provided to demonstrate the applications of the designed filtering. Comparisons with the result of the coherence-dependent Goldstein filter show that improvements from 18.4% to 36.9% are achieved when the variance-dependent filter is used, and the noisier the interferogram, the greater the improvement.
基金
Project(2013CB733303)supported by the National Basic Research Program of China
Projects(41222027,11103068,41104003)supported by the National Natural Science Foundation of China
Project(13JJ1006)supported by Hunan Provincial Natural Science Foundation,China
Project(TXCL-KF2013-002)supported by the Key Laboratory of Videometric and Vision Navigation of Hunan Province,China
Project(SKLGED2013-2-1-E)supported by the State Key Laboratory of Geodesy and Earth’s Dynamics,China
Project(K201208)supported by the Key Laboratory of Earth Observation Technique of National Administration of Surveying,Mapping and Geoinformation,China
关键词
滤波器
干涉
雷达
设计
噪声电平
信息丢失
过滤器
滤波参数
synthetic aperture radar interferometry （InSAR）
Goldstein filter
variance-dependent radar
coherence
multilook factor
