Based on the fact that anisotropy characteristic represents some intrinsic properties of scattering centers, an algorithm for extracting anisotropy characteristic of scattering centers is proposed when wide-angle SAR is used. Firstly, the components of the echo from a single scattering center are analyzed based on attributed scattering center model. Secondly, the estimation of anisotropy characteristic is transformed into an inverse issue of solving variation of single scattering center’s amplitude by using identity matrix as orthonormal basis. Finally, the inverse issue is solved under the constraints that the amplitude of scattering centers should be real and continuous. As a result, anisotropy characteristic is extracted from the solution of the inverse issue. Estimation results of both Matlab simulated and electromagnetic computation data validate that the proposed algorithm is not only precise but also robust. Moreover, the proposed method is more efficient compared with traditional methods.
高悦欣,李震宇,盛佳恋,邢孟道. 一种大转角SAR图像散射中心各向异性提取方法[J]. 电子与信息学报, 2016, 38(8): 1956-1961.
GAO Yuexin, LI Zhenyu, SHENG Jialian, XING Mengdao. Extraction Method for Anisotropy Characteristic of Scattering Center in Wide-angle SAR Imagery. JEIT, 2016, 38(8): 1956-1961.
ASH J N, ERTINE, POTTER L C, et al. Wide-angle synthetic aperture radar imaging: models and algorithms for anisotropic scattering[J]. IEEE Signal Processing Magazine, 2014, 31(4): 16-26. doi: 10.1109/MSP.2014.2311828.
[2]
MÜJDATÖ, IVANA S,ÖNHON N ?, et al. Sparsity-driven synthetic aperture radar imaging: Reconstruction, autofocusing, moving targets, and compressed sensing[J]. IEEE Signal Processing Magazine, 2014, 31(4): 27-40. doi: 10.1109/MSP.2014.2312834.
[3]
KUSH R V, MÜJDAT C, JOHN W F, et al. Sparse representation in structured dictionaries with application to synthetic aperture radar[J]. IEEE Transactions on Signal Processing, 2008, 56(8): 3548-3561. doi: 10.1109/TSP.2008. 919392.
[4]
KIM A, FISHER J, and WILLSKY A. Detection and analysis of anisotropic scattering in SAR data[J]. Multidimensional Systems and Signal Processing, 2003, 14(1): 49-82. doi: 10.1023/A:1022268908156.
JI Weijie and TONG Chuangming. Research on electromagnetic scattering computation and synthetic aperture radar imaging of ship located on two-dimensional ocean surface[J]. Acta Physica Sinica, 2012, 61(16): 11-18. doi: 10.7498/aps.61.160301.
ZHOU Jianxiong. The theory and technology on reconstruction of 3D scattering center from optical region radar[D]. [Ph.D. dissertation], National University of Defense Technology, 2006. doi: 10.7666/d.y1101904.
WU Min, ZHANG Lei, DUAN Jia, et al. Super-resolution SAR imaging algorithm based on attribute scattering center model[J]. Journal of Astronautics, 2014, 35(9): 1058-1064. doi: 10.3873/j.issn.1000-1328.2014.09.011.
LI Fei, JIU Bo, LIU Hongwei, et al. Sparse representation based algorithm for estimation of attributed scattering center parameter on SAR imagery[J]. Journal of Electronics & Information Technology, 2014, 36(4): 931-937. doi: 10.3724/ SP.J.1146.2013.00576.
[11]
DUAN Jia, ZHANG Lei, and XING Mengdao. Polarimetric target decomposition based on attributed scattering center model for synthetic aperture radar targets[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 11(12): 2095-2099. doi: 10.1109/LGRS.2014.2320053.
LI Fei, JIU Bo, WANG Yinghua, et al. Novel method for attributed feature extraction from SAR imagery[J]. Journal of Xidian University (Natural Science), 2015, 42(3): 15-21. doi: 10.3969/j.issn.1001-2400.2015.03.003.
[13]
DANE F F and MICHAEL A S. A high-frequency multipeak model for wide-angle SAR imagery[J]. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(7): 4279-4291. doi: 10.1109/TGRS.2012.2226732.
[14]
POTTER L C and MOSES R L. Attributed scattering centers for SAR ATR[J]. IEEE Transactions on Image Processing, 1997, 5(1): 79-91. doi: 10.1109/83.552098.
TAO Yong and HU Weidong. An aspect-dependence characteristics-based approach for parameter estimation of attribute scattering center model[J]. Signal Processing, 2010, 26(5): 736-740. doi: 10.3969/j.issn.1003-0530.2010.05.017.
[16]
Gerry M J, Potter L C, Gupta J I, et al. A parametric model for synthetic aperture radar measurements[J]. IEEE Transactions on Antennas and Propagation, 1999, 47(7): 1179-1188. doi: 10.1109/8.785750.
[17]
IVANA S, MÜJDAT C, and WILLIAM C K. Joint space aspect reconstruction of wide-angle SAR exploiting sparsity [C]. Proceedings of the SPIE Defense and Security Symposium, Orlando, FL, USA, 2008: 697005. doi: 10.1117/ 12.786288.
LIN Da, XU Xin, PAN Xuefeng, et al. Segmentation of SAR image of MSTAR SAR chips based on attributed scattering center feature and markov random field[J]. Geomatics and Information Science of Wuhan University, 2014, 39(11): 1314-1317. doi: 10.13203/j.whugis20130262.
[19]
LARS M H U, HANS H, and GUNNAR S. Synthetic- aperture radar processing using fast factorized back- projection[J]. IEEE Transactions on Aerospace and Electronic Systems, 2003, 39(3): 760-776. doi: 10.1109/TAES. 2003.1238734.
