Abstract
This paper proposes a coordinate-transform (CT) implementation for the fast factorized backprojection (FFBP) algorithm (CT-FFBP) to process high-resolution spotlight synthetic aperture radar (SAR) data. Unlike the FFBP utilizing two-dimensional image-domain interpolation for sub-aperture fusion, CT-FFBP finishes the image-projection using CT with the accommodation of chirp-z transform and circular shifting. Without interpolation, CT-FFBP yields enhanced efficiency over the interpolation based FFBP, besides maintaining high precision simultaneously. Both simulation and real-data experiments verifies the efficiency and precision superiorities of the CT-FFBP.
摘要
创新点
文章提出了一种基于坐标转化的快速分级后向投影算法, 该算法可用于高分辨率聚束合成孔径雷达成像。 与经典的基于二维图像域插值的快速后投影算法不同, 该算法利用坐标转化实现图像在不同局部极坐标系之间的投影, 进而相干叠加逐级提升分辨率, 坐标转化通过平移和chirp-z伸缩实现。 由于避免了插值操作, 与经典快速后投影算法相比该算法提升了运算效率, 同时保证高精度成像。 文中最后分别通过仿真实验和实测数据实验验证了算法的高效率和高精度。
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Munson D, O’Brien J, Jenkins W. A tomographic formulation of spotlight-mode synthetic aperture radar. Proc IEEE, 1983, 71: 917–925
Natterer F. The Mathematics of Computerised Tomography. New York: Wiley, 1986
Desai M, Jenkins W. Convolution backprojection image reconstruction for spotlight mode synthetic aperture radar. IEEE Trans Image Process, 1992, 1: 505–517
Jakowatz C, Wahl D, Yocky D. Beamforming as a foundation for spotlight-mode SAR image formation by backprojection. In: Proceedings of the SPIE Conference on Algorithms for Synthetic Aperture Radar Imagery XV, Orlando, 2008. 69700Q
Frey O, Magnard C, Rüegg M, et al. Focusing of air-borne synthetic aperture radar data from highly nonlinear flight tracks. IEEE Trans Geosci Rem Sens, 2009, 47: 1844–1858
Rodriguez-cassola M, Parts P, Krieger G, et al. Efficient time-domain image formation with precise topography accommodation for general bistatic SAR configurations. IEEE Trans Aerosp Electron Syst, 2011, 47: 2949–2966
Jakowatz C V, Wahl D E. Considerations for autofocus of spotlight-mode SAR imagery created using a beamforming algorithm. In: Proccedings of the SPIE Conference on Algorithms for Synthetic Aperture Radar Imagery XVI, Orlando, 2009. 73370A
Yegulalp F. Fast backprojection algorithm for synthetic aperture radar. In: Proceedings of the IEEE Radar Conference, Waltham, 1999. 60–65
Ulander L M H, Hellsten H, Stenstrom G. Synthetic-aperture radar processing using fast factorized back-projection. IEEE Trans Aerosp Electron Syst, 2003, 39: 760–776
Ponce O, Prats P, Rodriguez-Cassola M, et al. Processing of circular SAR trajectories with fast factorized backprojection. In: Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, Vancouver, 2011. 3692–3695
Yang Z, Sun G, Xing M. A new fast back-projection algorithm using polar format algorithm. In: Proceedings of Asia-Pacific Conference on Synthetic Aperture Radar, Tsukuba, 2013. 373–376
Zhang L, Li H, Qiao Z, et al. Integrating autofocus techniques with fast factorized back-projection for high-resolution spotlight SAR imaging. IEEE Trans Geosci Rem Sens, 2013, 10: 1394–1398
Rabiner L, Schafer R W, Rader C M. The chirp z-transform algorithm. IEEE Trans Audio Electron, 1969, 17: 86–92
Frolind P O, Ulander L M H. Evaluation of angular interpolation kernels in fast back-projection SAR processing. IEE Proc Radar Sonar Navig, 2006, 153: 243–249
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yang, Z., Xing, M., Zhang, L. et al. A coordinate-transform based FFBP algorithm for high-resolution spotlight SAR imaging. Sci. China Inf. Sci. 58, 1–11 (2015). https://doi.org/10.1007/s11432-014-5262-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11432-014-5262-x
Keywords
- spotlight
- synthetic aperture radar (SAR)
- fast factorized back-projection (FFBP)
- coordinatetransform (CT)