基于精确二维频谱的调频连续波SAR动目标特性分析

传统的调频连续波(FMCW)SAR运动目标特性的分析方法大都在时域展开，导致其对目标的特性研究存在近似或者不全面。基于此，该文提出一种基于精确2维频谱模型的FMCW SAR动目标特性分析方法。该方法充分考虑了天线平台及运动目标在脉冲收发期间运动的影响，推导了解析的FMCW SAR运动目标斜距模型，进而求解了非停-走模型下的运动目标的2维频谱模型。基于该模型该文系统地分析了动目标的成像特性，精确定量地研究了动目标2维速度的影响。相对于传统时域分析方法，该方法更加精确全面而且有着更好的适应性。仿真实验验证该文分析中结论的合理性和有效性。

Characteristics Analysis of Moving Target in Frequency-modulation Continuous-wave SAR Based on An Accurate 2-D Spectrum

The conventional characteristics analysis methods for moving target in Frequency Modulation Continuous Wave (FMCW) SAR all carry out in space-domain, leading to approximated and partial results. Therefore, a novel analysis approach based on an accurate two-dimensional spectrum is proposed in the paper. The approach takes accurately the continuous movements of antenna and moving targets during pulse transmission and reception into account and derives an analytical slant range model for moving targets in FMCW SAR, as well as an accurate two-dimensional spectrum. Based on the spectrum, the characteristics of moving target are discussed in detail, including the effects caused by 2-D velocities of moving target. Compared with its counterparts, it is more accurate and robust. Simulation experiments verify the reasonableness and effectiveness of the proposed method.