基于自仿射分形建模的干涉仿真
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摘要
对合成孔径雷达干涉仿真进行了深入研究,阐述了干涉仿真的基本原理,分析了影响干涉合成孔径雷达图像质量的各种噪声干扰因素,重点讨论了干涉合成孔径雷达仿真模型以及建立准确模型的重要性.比较了目前常用的干涉仿真模型,分析了这些模型在仿真过程中存在的缺陷,并基于自仿射分形理论建模仿真了实际的干涉过程,获得了满足合成孔径雷达空间采样率的数字高程模型.仿真结果表明,利用自仿射分形理论仿真不仅可以真实逼真地反映自然目标场景的随机起伏特性和雷达图像特有的几何畸变现象,而且可以对去相干因素进行定量分析,同时有助于验证干涉处理算法和优化系统设计.
INSAR(interferometric synthetic aperture radar) signal simulation methods were investigated deeply,and the fundamental principle of the INSAR simulation was presented.Various noise interference factors in INSAR images were analyzed.The simulation model of the INSAR system was discussed in detail,which indicated that the precise model was very important for the INSAR simulation.Present general simulation models were compared and their disadvantages in INSAR simulation were also analyzed.Based on the self-affine fractal theory,the real interferometric process was simulated and the DEM(digital elevation model) satisfying space sampling rate was acquired.Results demonstrate that not only the stochastic properties and geometric distortion phenomena of ground targets,which are particular for radar interfermetry,are reflected vividly,but also the various distortion factors can be analyzed quantitatively.It is helpful to verify all kinds of interferometric arithmetics and optimize INSAR system design.
INSAR(interferometric synthetic aperture radar) signal simulation methods were investigated deeply,and the fundamental principle of the INSAR simulation was presented.Various noise interference factors in INSAR images were analyzed.The simulation model of the INSAR system was discussed in detail,which indicated that the precise model was very important for the INSAR simulation.Present general simulation models were compared and their disadvantages in INSAR simulation were also analyzed.Based on the self-affine fractal theory,the real interferometric process was simulated and the DEM(digital elevation model) satisfying space sampling rate was acquired.Results demonstrate that not only the stochastic properties and geometric distortion phenomena of ground targets,which are particular for radar interfermetry,are reflected vividly,but also the various distortion factors can be analyzed quantitatively.It is helpful to verify all kinds of interferometric arithmetics and optimize INSAR system design.
引文
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[2]E inederM.E fficient simu lation of SAR interferogram s of largeareas and of rugged terrain[J].IEEE Transa Geosci RemoteSens,2003,41(6):1415-1427
[3]E ldhusetK.H igh resolution spaceborne INSAR simu lation w ithextended scenes[J].IEE Proc Radar Sonar Navig,2005,152(2):53-57
[4]Bam ler R,Ph ilipp H.Synthetic aperture radar interferom etry[J].Inverse Prob l,1998:14(4):R1-R54
[5]Rosen P A,Hensley S,Jough in Ian R,et al.Synthetic apertureradar interferom etry[J].Proc IEEE,2000,88(3):333-382
[6]Hanssen R F.Radar interferom etry:data interpretation and erroranalysis[M].Dordrecht:K luwer Academ ic Pub lishers,2001:32-33
[7]L iu Guoxiang.Mapp ing of earth deformations w ith satellite SARinterferom etry:a study of its accuracy and reliab ility perform-ance[D].Hong Kong:D epartm ent ofLand Surveying&Geo-In-formatics,The Hong Kong Polytechn ic Un iversity,2003
[8]Guarn ieri A M.SAR interferom etry and statistical topography[J].IEEE Trans Geosci Remote Sens,2002,40(12):2567-2581
[9]陈禺页,陈凌.分形几何学[M].北京:地震出版社,1998Chen Yu,Chen L ing.Fractal geom etry[M].Beijing:Earth-quake Press,1998(in Ch inese)
[10]胡庆东.干涉SAR系统相干性分析与相位展开算法研究[D].北京:北京航空航天大学电子信息工程学院,1998Hu Q ingdong.Study of coherence and unwrapp ing algorithm sin interferom etric SAR imageing[D].Beijing:School of E lec-tron ics and Information Engineering,Beijing Un iversity ofAeronautics and Astronautics,1998(in Ch inese)
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