title: Measurement Matrix Optimization and Mismatch Problem Compensation for DLSLA 3-D SAR Cross-Track Reconstruction.
abstract: With a short linear array configured in the cross-track direction, downward looking sparse linear array three-dimensional synthetic aperture radar (DLSLA 3-D SAR) can obtain the 3-D image of an imaging scene. To improve the cross-track resolution, sparse recovery methods have been investigated in recent years. In the compressive sensing (CS) framework, the reconstruction performance depends on the property of measurement matrix. This paper concerns the technique to optimize the measurement matrix and deal with the mismatch problem of measurement matrix caused by the off-grid scatterers. In the model of cross-track reconstruction, the measurement matrix is mainly affected by the configuration of antenna phase centers (APC), thus, two mutual coherence based criteria are proposed to optimize the configuration of APCs. On the other hand, to compensate the mismatch problem of the measurement matrix, the sparse Bayesian inference based method is introduced into the cross-track reconstruction by jointly estimate the scatterers and the off-grid error. Experiments demonstrate the performance of the proposed APCs' configuration schemes and the proposed cross-track reconstruction method.
authors.affiliation: Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences (IECAS), Beijing 100190, China. baoqiancherry@163.com.|University of Chinese Academy of Sciences (UCAS), Beijing 100190, China. baoqiancherry@163.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Bao
authors.affiliation: Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences (IECAS), Beijing 100190, China. chenglong.j@gmail.com.|University of Chinese Academy of Sciences (UCAS), Beijing 100190, China. chenglong.j@gmail.com.
authors.forename: Chenglong
authors.initials: C
authors.lastname: Jiang
authors.affiliation: Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences (IECAS), Beijing 100190, China. ylin@mail.ie.ac.cn.
authors.forename: Yun
authors.initials: Y
authors.lastname: Lin
authors.affiliation: College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China. wxtannm@163.com.
authors.forename: Weixian
authors.initials: W
authors.lastname: Tan
authors.affiliation: Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. zhirui1990@126.com.
authors.forename: Zhirui
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences (IECAS), Beijing 100190, China. whong@mail.ie.ac.cn.
authors.forename: Wen
authors.initials: W
authors.lastname: Hong
keywords: DLSLA 3-D SAR; measurement matrix mismatch; measurement matrix optimization; mutual coherence; sparse Bayesian inference