为了简化多通道InSAR数据仿真的步骤,给多通道InSAR技术的研究提供参数可控的仿真数据,提出一种多通道InSAR干涉图的仿真方法.方法由已知的数字高程模型(DEM)和系统参数计算得到每个干涉通道的真实干涉相位,并根据各种噪声引起的去相关计算相应的相干系数,然后利用舍选法生成相应的相位噪声加入到真实干涉相位中,这样便得到所需的多通道InSAR干涉图.分析和仿真结果表明,该方法简便易行,且严格考虑了干涉相位噪声的概率密度函数,为各种多通道InSAR技术的性能对比和定量分析提供合适的仿真数据.
In order to simplify the procedure of multi-channel InSAR interferogram simulation and to provide simulated data with adjustable parameters for studies of multi-channel InSAR technology, we propose a multi-channel InSAR interferogram simulation method. The method uses the available DEM and system parameters to calculate the real interferometric phase for each channel, and calculates the coherence caused by various kinds of noise. Then the method utilizes acceptance-rejection method to generate the corresponding phase noise, and adds it to the real interferometric phase. So the needed multi-channel InSAR interferograms are obtained. Analysis and simulation results indicate that the approach is simple and convenient. The approach considers the interferometric phase noise's probability density function strictly, and it provides suitable simulation data sets for the performance comparison and quantitative analysis of various kinds of multi-channel InSAR technique.
[1] Ferraiuolo G, Meglio F, Pascazio V, et al. DEM reconstruction accuracy in multichannel SAR interferometry[J]. IEEE Transactions on Geoscience and Remote Sensing, 2009, 47(1): 191-201.
[2] 庞蕾, 张继贤, 范洪冬. 多基线干涉SAR测量技术发展与趋势分析[J]. 电子学报, 2010, 38(9): 2 152-2 157.
[3] He Z, He F, Dong Z, et al. real-time raw-signal simulation algorithm for inSAR hardware-in-the-loop simulation applications[J]. IEEE Geoscience and Remote Sensing Letters, 2012, 9(1): 134-138.
[4] Mori A, Vita F D. A time-domain raw signal simulator for interferometric SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2004, 42(9): 1 811-1 817.
[5] Franceschetti G, Iodice A, Migliaccio M, et al. A novel across-track SAR interferometry simulator[J]. IEEE Transactions on Geoscience and Remote Sensing, 1998, 36(3): 950-962.
[6] Franceschetti G, Migliaccio M, D. Riccio, et al. SARAS: A synthetic aperture radar (SAR) raw signal simulator[J]. IEEE Transactions on Geoscience and Remote Sensing, 1992, 30(1): 110-122.
[7] 汪丙南, 陈立福, 向茂生. 基于起伏地形的干涉SAR 回波数据仿真[J]. 宇航学报, 2011, 32(9): 1 986-1 993.
[8] Xu W, Cumming I. Simulator for repeat-pass satellite inSAR studies [C]//IEEE IGARSS 97, Singapore. 1997: 1 704-1 706.
[9] 李文强, 李景文, 陈杰. 一种干涉SAR 复图像数据的快速仿真方法[J]. 北京航空航天大学学报, 2005, 31(1): 31-35.
[10] Eineder M. Efficient simulation of SAR interferograms of large areas and of rugged terrain[J]. IEEE Transactions on Geoscience and Remote Sensing, 2003, 41(6): 1 415-1 427.
[11] Lombardini F. Absolute phase retrieval in a three-element synthetic aperture interferometer [C]//Proc CIE Int Conf Radar, Beijing, China,1996: 309-312.
[12] Yu H W, Li Z F, Bao Z A. cluster-analysis-based efficient multibaseline phase-unwrapping algorithm[J]. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(1): 478-487.
[13] Li Z F, Bao Z, Suo Z Y. A joint image coregistration, phase noise suppression, and phase unwrapping method based on subspace projection for multibaseline InSAR systems[J]. IEEE Transactions on Geoscience and Remote Sensing, 2007, 45(3): 584-591.
[14] 张红敏, 靳国旺, 徐青,等. 多基线InSAR 干涉图仿真方案设计与分析[J]. 系统仿真学报, 2012, 24(7): 1 516-1 522.
[15] Pascazio V, Schirinzi G. Multifrequency InSAR height reconstruction through maximum likelihood estimation of local planes parameters[J]. IEEE Transactions on Image Processing, 2002, 11(12): 1 478-1 489.
[16] Tough R J A, Blacknell D, Quegan S. A statistical description of polarimetric and interferometric synthetic aperture radar[J]. Proceeedings of the Royal Society London A, 1995, 449: 567-589.
[17] Bamler R, Hartl P. Synthetic aperture radar interferometry [J]. Inverse Problems, 1998, 14(4): R1-R54.
[18] Hanssen R F. Radar interferometry: data interpretation and error analysis[M]. Dordrecht: Kluwer Academic Publishers, 2001.
[19] Ghiglia D C, Pritt M D. Two-dimensional phase unwrapping: theory, algorithms, and software[M]. New York: Wiley, 1998.
