同航线双基聚束式SAR宽场景成像算法

摘要

该文在现有双基SAR成像研究的基础上,提出了同航线双基聚束式SAR成像的算法.该算法首先对回波信号进行方位预处理实现信号支撑区的不模糊,然后利用传统波数域的成像算法聚焦.该算法较双基极坐标算法有更高的聚焦精度并且没有几何形变.它不仅适用于平行航线的双基成像,其思路也完全适用于其它聚束模式的成像处理.最后通过仿真验证了算法的正确性.%Based on the current research on bistatic SAR image, a new algorithm to process data of repeated trajectory bistatic spotlight SAR system is proposed. The algorithm first suppress azimuth aliasing with an azimuth preprocess step, and focus image with traditional wavenumber domain algorithm. It is with high focusing accuracy without distortion involved, by which well focused image over large scene can be obtained. The principal of the azimuth preprocess is also suited to deal with other spotlight SAR mode. And a numeric simulation confirms the validity of the algorithm.