关键词: 雷达工程 , 孔径渡越时间 , 实波束地图测绘 , 多普勒波束锐化 , 斜视合成孔径雷达

Abstract: The signal waveforms of airborne synthetic aperture radar (SAR) experimental system with several different resolutions were designed based on the analysis of aperture dispersive effects of phased array antennas, and the corresponding SAR imaging techniques were discussed. In the Doppler beam sharpening (DBS) mode, the migration through range resolution correction (MTRL) and quadratic phase compensation technique were used to improve DBS resolution. In the squint SAR mode, the SAR imaging scheme, including the time domain MTRし，frequency domain range curvature correction and the third phase compensation technique, was used to extend squint SAR azimuth focus depth based on the characters of bigger MTRC and smaller range curvature. The initial flying experimental data were used for system analysis,, and SAR images with high quality could be obtained. I he results verify the rationality of the introduced experimental system design and its imaging scheme.

Key words: radar engineering , aperture fill time , real beam mapping , Doppler beam sharpening , squint synthetic aperture radar