Geometric constraints based 3D reconstruction method of tomographic SAR for buildings  被引量:4

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作  者:Dong HAN Zekun JIAO Liangjiang ZHOU Chibiao DING Yirong WU 

机构地区:[1]Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China [2]National Key Laboratory of Microwave Imaging Technology,Beijing 100190,China [3]School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出  处:《Science China(Information Sciences)》2023年第1期260-272,共13页中国科学(信息科学)(英文版)

基  金:supported by National Natural Science Foundation of China (Grant Nos.61991420,61991421,61991424,62101535)。

摘  要:The mainstream methods of tomographic synthetic aperture radar(tomoSAR)3D reconstruction are usually realized by processing the registered 2D SAR images pixel by pixel without considering the geometric structure of the observed targets.As a class of targets with regular facades,tomo SAR 3D reconstruction of buildings is of important application value nowadays.In this study,to optimize the tomo SAR3D reconstruction results of buildings,we first introduce and analyze the tomo SAR 3D reconstruction theory based on a back projection imaging algorithm and then present a tomo SAR 3D reconstruction method based on geometric constraints.We can accurately extract the building’s facade as the geometric constraints by processing and fusing the point density map and the height map extracted from the spatial distribution of the tomo SAR 3D point cloud.Taking the extracted geometric structure of the building’s facade and signal to noise ratio(SNR)of registered 2D SAR images as prior information,we then impose geometric constraints on tomo SAR sparse 3D reconstruction with an adaptive iterative shrinkage-thresholding algorithm and achieve an optimized tomo SAR 3D reconstruction result.Finally,measured data of a P-band airborne tomo SAR system is used.3D reconstruction results show that the proposed method outperforms the traditional methods without geometric constraints regarding 3D reconstruction performance,which proves the validity and practicality of our proposed method.

关 键 词:tomographic SAR 3D reconstruction of buildings geometric constraints back projection compressed sensing 

分 类 号:TN957.52[电子电信—信号与信息处理]

 

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