星/机双基地混合滑动聚束式SAR距离-多普勒成像算法

Spaceborne/Airborne Hybrid Sliding Spotlight Bistatic SAR Range-Doppler Imaging Algorithm

该文提出了星/机双基地混合滑动聚束式SAR的距离-多普勒成像算法。文中首先通过级数反演法得到了此双基构型下场景目标的2维频谱,并通过解析近似得到随距离空变的频谱表达。在此基础上,提出了先根据谱分析技术对回波信号进行方位去混叠处理,再进行2维频域处理得到全孔径聚焦的双基地SAR距离-多普勒成像算法。该算法不需要进行子孔径分块和插值操作,运算量小,效率高。最后通过仿真实验验证了算法的有效性。

A new range-Doppler imaging algorithm is presented for processing bistatic Synthetic Aperture Radar（SAR） data acquired in the hybrid spaceborne/airborne sliding spotlight SAR configuration.This paper firstly presents the 2-D point target spectrum by using the series reversion,and then analyses the spectrum with the space-variant in range.Based on the previous discussions,the algorithm overcomes the spectrum folding of the azimuth raw signal with a SPECtral ANalysis（SPECAN） process,and focuses the full image in the Doppler domain.Without sub-aperture and interpolation,this algorithm is great in computational efficiency.Simulation results confirm the validity of the imaging algorithm.