Fast Time-Domain Imaging in Elliptical Polar Coordinate for General Bistatic VHF/UHF Ultra-Wideband SAR With Arbitrary Motion
Fast Time-Domain Imaging in Elliptical Polar Coordinate for General Bistatic VHF/UHF Ultra-Wideband SAR With Arbitrary Motion
复制标题
任意运动通用双基地VHF/UHF超宽带SAR椭圆极坐标快速时域成像
DOI：
10.1109/jstars.2014.2347413
复制
发表时间：
2015-02
影响因子：
5.5
通讯作者：
Zhou, Zhimin
中科院分区：
文献类型：
--
作者：
Xie, Hongtu;An, Daoxiang(安道祥);Huang, Xiaotao;Zhou, Zhimin
针对通用双基地VHF/UHF超宽带合成孔径雷达，提出了一种快速时域成像算法——双基地快速分解反投影算法（BFFBPA）。该方法既能准确处理大的空间变异性距离单元偏移、严重的距离-方位耦合和复杂的运动误差，又能达到与频域算法相似的成像效率。它以椭圆极坐标表示子图像，以减少计算量。给出了该坐标系下任意运动的成像几何图形，并推导了双基地反投影算法（BPA），为双基地反投影算法提供了基础。在考虑运动误差的情况下，推导出椭圆子图像更精确的采样要求，以在成像质量和效率之间实现近乎最优的平衡，并讨论了运动误差对可接受采样要求的约束。基于这一采样要求，分析了椭圆子图像网格在BFFBPA中的优势。在BFFBPA中进行相位误差校正以减少由内插引起的相位误差的影响。推导了该双稳态双酚a的加速系数。仿真结果和评价验证了理论分析的正确性和所提方法的有效性。
In this paper, a fast time-domain imaging algorithm called bistatic fast factorized back projection algorithm (BFFBPA) is proposed for the general bistatic VHF/UHF ultra-wideband synthetic aperture radar. It cannot only accurately dispose the large spatial variant range cell migrations, serious range-azimuth coupling and complicated motion error, but also achieve the imaging efficiency similar to frequency-domain algorithms. It represents subimages in elliptical polar coordinate to reduce the computational load. The imaging geometry with arbitrary motion in this coordinate system is provided, and the bistatic back projection algorithm (BPA) is derived to provide a basis for the proposed BFFBPA. Considering motion errors, the more accurate sampling requirements for elliptical subimages is deduced to offer the near-optimum tradeoff between the imaging quality and efficiency, and the constraint of motion errors for acceptable sampling requirements is discussed. Based on this sampling requirement, the advantage of using elliptical subimage grids for this BFFBPA is analyzed. A phase error correction is performed to reduce the impact of phase errors caused by interpolations in the BFFBPA. The speed-up factor of this BFFBPA with respect to the bistatic BPA is derived. Simulation results and evaluations are given to prove the correctness of the theory analysis and validity of the proposed method.
登录
查看更多内容
DOI：
--
发表时间：
2000
期刊：
Jounal of Xidian University
影响因子：
--
作者：
Cheng Yu
通讯作者：
Cheng Yu
DOI：
10.1109/apsar.2007.4418689
发表时间：
2007-11
期刊：
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar
影响因子：
--
作者：
Chen Juan;Xiong Jintao;Huang Yulin;Yang Jiangyu
通讯作者：
Chen Juan;Xiong Jintao;Huang Yulin;Yang Jiangyu
DOI：
--
发表时间：
1984
期刊：
Hitachi review
影响因子：
--
作者：
N. Hamano;F. Komura;Y. Kubo
通讯作者：
N. Hamano;F. Komura;Y. Kubo
影响因子：
1.7
作者：
Ulander, L. M. H.;Barmettler, A.;Stenstrom, G.
通讯作者：
Stenstrom, G.
DOI：
10.1117/12.719700
发表时间：
2007-04
期刊：
--
影响因子：
--
作者：
J. Rasmusson;Martin Blom;B. Flood;P. Frölind;A. Gustavsson;T. Jonsson;B. Larsson;G. Stenström;L. Ulander
通讯作者：
J. Rasmusson;Martin Blom;B. Flood;P. Frölind;A. Gustavsson;T. Jonsson;B. Larsson;G. Stenström;L. Ulander