中文摘要：

双站前视低频超宽带（UWB）SAR兼具双站前视的复杂成像构型和低频UWB的强距离方位耦合两个特点,因此极大地增加了实现高精度成像处理的难度。针对这个问题,该文提出一种基于快速因式分解后向投影（FFBP）算法的双站前视低频UWB SAR成像处理方法。首先,基于双站前视低频UWB SAR的成像几何构型和信号模型,给出了双站前视低频UWB SAR原始BP算法成像的原理和流程。其次,在上述基础上,推导了双站前视低频UWB SAR FFBP算法成像处理的精确相位误差形式,并分析了相位误差对成像处理的影响,据此建立了双站前视低频UWB SAR FFBP成像处理中的子孔径和子区域划分原则。接下来,给出了双站前视低频UWB SAR FFBP算法成像处理流程,并对比分析了BP算法和FFBP算法的成像效率。最后,利用仿真实验证明了文中所作理论分析的正确性和所提方法的有效性。

英文摘要：

Bistatic forward looking low frequency Ultra Wide Band（UWB） Synthetic Aperture Radar（SAR） has both complicated imaging geometry and strong range-azimuth coupling, which increases the difficulty of high-precision imaging extremely. In order to solve this problem, this paper proposes an approach based on Fast Factorized Back Projection（FFBP） algorithm to focus the low frequency UWB Bistatic Forward-looking SAR（BFSAR） data. First, based on the imaging geometry of BFSAR, the principle and implementation of Back Projection（BP） algorithm are presented. Then, the phase error in FFBP algorithm is analyzed, and the formula of the phase error in bistatic forward looking SAR is derived. The implementation of FFBP algorithm is presented, and the computational burden of BP algorithm and FFBP algorithm are estimated and compared. Finally, the simulation experiment is progressed, and the results prove the correctness of analysis and the validity of the proposed approach.