摘要
针对下视阵列合成孔径雷达(SAR)在跨航向实现高分辨所需阵元数目庞大和信号处理复杂的问题,提出一种机载下视阵列SAR等效相位中心(EPC)分析的方法。首先基于有效孔径原理和EPC处理的信号模型,引入虚拟阵元位置优化因子,研究了均匀线性阵列的EPC分析方法。然后,结合机载下视阵列SAR特点,讨论了优化因子的选择问题,给出了最优近似的理论依据,并通过点目标成像结果对EPC方法进行了验证。最后根据EPC分析方法给出了稀疏线性阵列和多输入多输出(M I-MO)线性阵列两种典型的适用于下视阵列SAR的阵列结构实例。
Aiming at the problem that numerous array elements are needed and signal processing is complex for realizing high resolution of downward-looking array Synthetic Aperture Radar（SAR） in cross-track direction,an analyzing approach of Equivalent-Phase-Center（EPC） of downward-looking array SAR is proposed.Firstly,based on effective aperture principle and signal model of EPC processing,optimization factor of virtual array element is introduced and EPC analyzing approach of linear array is studied.Then,combined with the feature of airborne downward-looking array SAR,the selection of optimization factor is discussed,the theory basis of optimum approximation is given and the EPC approach is validated through the imaging result of point target.Finally,according to EPC analyzing approach,two representative models appropriate for downward-looking array SAR based on sparse linear array and Multi-input/Multi-output（MIMO） linear array are presented.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2010年第9期2154-2160,共7页
Chinese Journal of Scientific Instrument
