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摘要: 多平台合成孔径雷达(SAR)是合成孔径雷达极具发展潜力的研究方向之一，该文集中讨论了多平台SAR的成像算法，包括机载SAR、弹载SAR和星载SAR平台。该文首先简要阐述了SAR回波模型的建立，包括“斜距模型和成像模式”，然后综述了近年来机载SAR、弹载SAR和星载SAR成像算法的研究进展，并详细阐述了各平台固有的特性以及面临的挑战，最后对未来多平台SAR成像算法研究的发展趋势进行了展望。Abstract: The multi-platform-borne Synthetic Aperture Radar (SAR) has become one of the most explored research directions in the domain of SAR. This study discusses the imaging algorithms in multi-platform-borne SARs such as airborne SAR, missile-borne SAR, and spaceborne SAR. First, the establishment of the radar echo model is briefly introduced, including two main points: slant range-model and imaging mode. Subsequently, the imaging algorithms of the aforementioned multi-platform-borne SARs developed and used in recent years are summarized. In addition, the inherent characteristics and challenges are described. Finally, the future development trends of the research are discussed.
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图 2 Stripmap，Spotlight和Scan SAR工作几何
Figure 2. Working geometry of Stripmap, Spotlight and Scan SAR
图 4 X波段1 m分辨率机载运动补偿前后成像结果图
Figure 4. 1 m resolution imaging results of airborne SAR before and after motion compensation in X band
图 5 带宽合成前后的铁路周围成像图
Figure 5. Imaging results around the railway before and after band combination
图 6 采用Two-step进行运动补偿后的RCMC结果
Figure 6. The results of RCMC after motion compensation by Two-step algorithm
图 10 X波段0.1 m大斜视成像结果
Figure 10. 0.1 m resolution imaging results in squint mode and X band
图 11 X波段0.8 m分辨率大斜视50°方位重采样成像结果
Figure 11. 0.8 m resolution imaging results by azimuth resampling with squint angle of 50° and X band
图 12 Ku波段1.36 m分辨率65°大斜视成像结果
Figure 12. 1.36 m resolution imaging results in 65° of squint mode in Ku band
图 13 Ku波段1.5 m大斜视俯冲段处理结果
Figure 13. Ku band imaging results of 1.5 m resolution in the case of dive trajectory and squint mode
图 16 Ku波段3.5 m TOPS SAR数据聚焦结果
Figure 16. 3.5 m resolution TOPS SAR imaging results in Ku band
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