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A New Factorized backprojection Algorithm for Stripmap Synthetic Aperture Radar

Positioning 2013年第1期4卷 42-56页

作者： Kyra Moon David G. Long Microwave Earth Remote Sensing Laboratory Brigham Young University Provo USA

Factorized backprojection is a processing algorithm for reconstructing images from data collected by synthetic aperture radar (SAR) systems. Factorized backprojection requires less computation than conventional time-domain backprojection with minimal loss in accuracy for straight-line motion. However, its implementation is not as straightforward as direct backprojection. This paper provides a new, easily parallelizable formulation of factorized backprojection designed for stripmap SAR data that includes a method of implementing an azimuth window as part of the factorized backprojection algorithm. We compare the performance of windowed factorized backprojection to direct backprojection for simulated and actual SAR data.

关键词： backprojection Windows Synthetic Aperture Radar (SAR)

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A Time－space Domain backprojection Method for Ray Inversion in Layered Medium

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Journal of Harbin Institute of Technology(New Series) 1994年第1期1卷 85-87页

作者：马兴瑞陶良黄文虎

The distribution of incident angles of the discrete projection data may be uneven when the wave rays in random medium are nonlinear, moreover, the far field condition will be broken down when the inversion region is large. Thus the inversion result will be distorted unavoidably in many ray inversion methods. In order to eliminate these influences, a new t-x(time-spac) domain backprojection method compensating the density of the distribution of incident angles is developed. The paper provides the principle of the incident angle compensation and simulation result of a point defect in layered medium.

关键词： ss: Incident angle compensation t-x Domain backprojection ray inversion in homogeneous medium

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Resolving rupture processes of great earthquakes: Reviews and perspective from fast response to joint inversion

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Science China Earth Sciences 2020年第4期63卷 492-511页

作者： Han YUE Yong ZHANG Zengxi GE Teng WANG Li ZHAO School of Earth and Space Sciences Peking UniversityBeijing 200871China

Resolving rupture processes of great earthquakes has fundamental importance to the study of earthquake physics,rupture dynamics, fault zone structure, and evolving processes. It also plays an essential role in earthquake hazard estimation,emergency response and seismic hazard mitigation. This paper reviews the major progress of the earthquake rupture process studies in the last decades, with an emphasize on the research directions of the department geophysics of Peking University including real-time response, back-projection techniques, geodetic data analysis, joint inversion and inversion in complex earth medium. We discussed the advantages and limitations of tradition methods;proposed a systematic and integrated approach from fast-response to detailed study. We also raised perspectives of using source models for ground motion prediction and the possibility of full-dynamic inversion.

关键词： Finite fault model backprojection Joint inversion Strong motion Simulation

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IMAGE RECONSTRUCTION AND OBJECT CLASSIFICATION IN CT IMAGING SYSTEM

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Nuclear Science and Techniques 1995年第2期6卷 108-112页

作者：张晓明蒋大真卢宋林 InstituteofNuclearResearch theChineseAcademyofSciencesShanghai201800

By obtaining a feasible filter function,reconstructed images can be got with linear interpolation and liftered backprojection *** the gray and spstial correlation neighbour informations of each pixel,a new supervised classification method is put forward for the reconstructed images,and an experiment with noise image is done,the result shows that the method is feasible and accurate compared with ideal phantoms.

关键词： Filter function backprojection Image reconstruction Fuzzy clustering Object classification

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