InSAR相位解缠算法的实验对比研究
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摘要
相位解缠是InSAR处理中的一个关键步骤,相位解缠算法的选取很大程度上影响着最终的结果。本文主要介绍和比较了6种常用的相位解缠算法,并选取西藏当雄地区的地震同震影像进行实验分析,对解缠结果的质量进行评价比较。结果表明:统计耗费网络流算法结果充分顾及了相干图所包含的信息,获得了一个较优的全局解,解缠结果的连续性较好。而且直接处理感兴趣的且数据质量好的离散区域,实现效率高,可以将误差限制在一个小范围内,防止误差的再传递,解缠结果较精确。
Phase unwrapping is crucial in InSAR processing,and the suitable phase unwrapping algorithm influences the final result to a large degree.We mainly introduce and compare 6 phase unwrapping algorithms,and obtain unwrapping results by processing co-seismic images in Dangxiong,Tibet.With evaluating and comparing these results,we conclude that Snaphu algorithm makes full allowance of the information in coherence map,obtains better global optima,and has a good continuity.In addition it can directly process the discrete area that is interested and of high-quality.Snaphu algorithm has a high efficiency and can limit the error in a small area,which prevents the error from spreading and gets an accurate result.
Phase unwrapping is crucial in InSAR processing,and the suitable phase unwrapping algorithm influences the final result to a large degree.We mainly introduce and compare 6 phase unwrapping algorithms,and obtain unwrapping results by processing co-seismic images in Dangxiong,Tibet.With evaluating and comparing these results,we conclude that Snaphu algorithm makes full allowance of the information in coherence map,obtains better global optima,and has a good continuity.In addition it can directly process the discrete area that is interested and of high-quality.Snaphu algorithm has a high efficiency and can limit the error in a small area,which prevents the error from spreading and gets an accurate result.
引文
[1]Akira Hirose,Ryo Yamaki.Phase Unwrapping with Phase-Singularity Spreading[C]//IGARSS2006.
[2]季灵运,王庆良,杨成生,郝明.相位解缠算法的分析与评价[J].测绘工程,2008,17(5).
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[5]Thomas J.Flynn.Two-dimensional phase unwrapping with minimum weighted discontinuity[J].J.Opt.Soc,1997,14(10).
[6]Ghiglia DC,Pritt MD.Two-dimensional Phase Unwrapping:Theory,Algorithms,and Software[M].New York:Wiley-Intersci,1998:493.
[7]Pritt M D,Shipman J S.Least-squares two-dimensional phase unwrapping using FFTS[J].IEEE Trans.Geosi.RemoteSens,1994,32(3):706-708.
[8]Costantini M.A phase unwrapping method based on network programming[Z].Proc.Fringe96 Workshop,Zurich,Switzerland.1996.
[9]D.C.Ghiglia,L.A.Romero.Robust two-dimensional weighted and unweighted phase unwrapping that uses fast trans-forms and iterative methods[J].Opt.Soc.Amer.A,1994,11(1):107-117.
[10]于勇,王超,张红,刘智,高鑫.基于不规则网络下网络流算法的相位解缠方法[J].遥感学报,2003,7(6).
[11]高勇.干涉SAR的二维相位解缠算法研究[J].地理学与国土研究,2000,16(4).
[12]许才军,王华.InSAR相位解缠算法比较及误差分析[J].武汉大学学报(信息科学版),2004,29(1).
[2]季灵运,王庆良,杨成生,郝明.相位解缠算法的分析与评价[J].测绘工程,2008,17(5).
[3]王超,张红,刘智.星载合成孔径雷达干涉测量[M].科学出版社,2002.
[4]Goldstein R M,Zebker H A,Werner C L.Satellite radar interferometry:Two-dimensional phase unwrapping[J].RadioScience,1998,23(4):713-720.
[5]Thomas J.Flynn.Two-dimensional phase unwrapping with minimum weighted discontinuity[J].J.Opt.Soc,1997,14(10).
[6]Ghiglia DC,Pritt MD.Two-dimensional Phase Unwrapping:Theory,Algorithms,and Software[M].New York:Wiley-Intersci,1998:493.
[7]Pritt M D,Shipman J S.Least-squares two-dimensional phase unwrapping using FFTS[J].IEEE Trans.Geosi.RemoteSens,1994,32(3):706-708.
[8]Costantini M.A phase unwrapping method based on network programming[Z].Proc.Fringe96 Workshop,Zurich,Switzerland.1996.
[9]D.C.Ghiglia,L.A.Romero.Robust two-dimensional weighted and unweighted phase unwrapping that uses fast trans-forms and iterative methods[J].Opt.Soc.Amer.A,1994,11(1):107-117.
[10]于勇,王超,张红,刘智,高鑫.基于不规则网络下网络流算法的相位解缠方法[J].遥感学报,2003,7(6).
[11]高勇.干涉SAR的二维相位解缠算法研究[J].地理学与国土研究,2000,16(4).
[12]许才军,王华.InSAR相位解缠算法比较及误差分析[J].武汉大学学报(信息科学版),2004,29(1).
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