PS-InSAR公共主影像选择方法的研究
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摘要
PS-InSAR干涉中公共主影像的选择关系到干涉的质量。本文在综合考虑时空基线距和多普勒质心频率基线对干涉图去相关影响的基础上,提出以综合相关系数为测度的公共主影像最佳选择方法。借助欧空局提供的20景大同地区ENVISAT SLC SAR图像,进行PS-InSAR公共主影像的优化选取实验。通过计算发现,指数权比对公共主影像的选择影响不大,因此建议在实际应用过程中,可直接按等指数权比计算综合相关系数,以此确定最佳公共主影像。
The choice of common master image in PS-InSAR interferometry is related to the interferometric quality.Considering the spatial baselines,temporal baselines and the Doppler centroid frequency difference on interferometric decorrelation of image pairs,this paper proposed a method about optimal selection of commom master image flow to integrated correlation function.With the aid of European Space Agency providing 20 ENVISAT SLC SAR scenes over Datong,the experiments of commom master image selection in PS-InSAR were performed.Testing results showed that the weight proportion of parameters had little influence on optimum selection,and it was suggested that in the practical application,optimum selection can be determined in accordance with equal weight proportion of parameters.
The choice of common master image in PS-InSAR interferometry is related to the interferometric quality.Considering the spatial baselines,temporal baselines and the Doppler centroid frequency difference on interferometric decorrelation of image pairs,this paper proposed a method about optimal selection of commom master image flow to integrated correlation function.With the aid of European Space Agency providing 20 ENVISAT SLC SAR scenes over Datong,the experiments of commom master image selection in PS-InSAR were performed.Testing results showed that the weight proportion of parameters had little influence on optimum selection,and it was suggested that in the practical application,optimum selection can be determined in accordance with equal weight proportion of parameters.
引文
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[9]FERRETTI A,PRATI C.Higher-order permanent scatter analysis[J].EURASIP Journal on Applied Signal Processing 2005(20):3231-3242.
[2]FERRETTI A,PRATI C,ROCCA F.Permanent scatterers in SAR interferometry[J].IEEE Transactions on Geoscience and Remote Sensing,2001,39(1):8-20.
[3]LYONS S,SANDWELL D.Fault creep along the southern San Andrews from interferometric synthetic aperture radar,permanent scatterers and stacking[J].Journal of Geophysical Research,2003,108(B1):1101-1124.
[4]程滔,单新建.CR,PS干涉测量联合解算算法研究[J].地震,2007,27(2):64-71.
[5]王艳,廖明生,李德仁,等.利用长时间序列相干目标获取地面沉降场[J].地球物理学报,2007,50(2):598-604.
[6]刘国祥,陈强,丁晓利.基于雷达干涉永久散射体网络探测地表形变的算法与实验结果[J].测绘学报,2007,36(1):13-18.
[7]KAMPES B,ADAM N.Velocity field retrieval from long term coherent points in radar interferometric stacks[J].IEEE,2003(0-7803-7929-2):941-944.
[8]陈国浒,刘云华,单新建.PS-InSAR技术在北京采空塌陷区地表形变测量中的应用探析[J].中国地质灾害与防治学报,2010,21(2):59-63.
[9]FERRETTI A,PRATI C.Higher-order permanent scatter analysis[J].EURASIP Journal on Applied Signal Processing 2005(20):3231-3242.
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