滑动聚束FMCW-SAR的子孔径波数域成像算法

该文分析了滑动聚束调频连续波合成孔径雷达的几何关系，建立了回波模型并推导了回波信号频谱。根据其信号特性，提出了一种子孔径波数域算法。该算法利用波数域匹配滤波和距离堆栈方法精确补偿了距离方位耦合相位，避免了插值操作，计算精度高，适用于斜视工作模式。通过子孔径相干合成实现了比条带模式更高的方位分辨率，同时利用子孔径图像的拼接得到了比聚束模式更宽的测绘区域。仿真结果及分析验证了所建信号模型的合理性和该算法的有效性。 

A Subaperture Wavenumber Domain Imaging Algorithm for Sliding Spotlight FMCW-SAR

This paper analyses the geometry of sliding spotlight FMCW-SAR, sets up the echo model and derives the two-dimensional spectrum of its echo signal. According to its signal characteristics a subaperture wavenumberdomain algorithm is presented, which corrects the Doppler Frequency Shift Effect caused by the motion within the sweep. The algorithm can acquire the images with azimuth resolution better than that obtained in the stripmap case by the subaperture coherent recombination and with an imaged area larger than that achieved in the spotlight operation by adjoining the subaperture images. Rationality of the echo model and the effectiveness of the proposed algorithm are verified by the simulation results and analysis.