上海航天（中英文）2026，Vol.43Issue(2)：28-36,9.DOI:10.19328/j.cnki.2096-8655.2026.02.003
星地双基地SAR观测模式与成像处理研究
Research on the Mode and Imaging Processing of Space-surface Bistatic SAR
摘要
Abstract
Space-surface bistatic synthetic aperture radar(SS-BSAR)takes in-orbit satellites as non-cooperative illuminators,offering advantages such as high timeliness,multi-dimensional information acquisition,and multi-frequency fusion.However,its bistatic geometry introduces pronounced spatial variation in its imaging performance,and the observation modes affect the key system metrics like resolution and signal-to-noise ratio(SNR).In view of these,the multi-observation modes and imaging processing of SS-BSAR are investigated.First,the operating principles and characteristics of the stripmap mode and terrain observation by progressive scans(TOPS)mode are compared and analyzed.Then,the two-dimensional resolution and SNR performances of the SS-BSAR system are analyzed.Finally,the imaging performance analysis and point-target simulations are conducted with the parameters from the LT-1(stripmap mode)and Sentinel-1(TOPS mode)satellites by a processing method suited to non-cooperative SS-BSAR.The results show that the SS-BSAR imaging performance exhibits spatial variability across the scene,with the TOPS mode suffering significantly lower azimuth resolution and coherent integration gain than the stripmap mode due to beam scanning.关键词
合成孔径雷达(SAR)/星地双基地SAR/滑动扫描观测(TOPS)模式/二维分辨率/成像Key words
synthetic aperture radar(SAR)/space-surface bistatic SAR/terrain observation by progressive scans(TOPS)mode/two-dimensional resolution/imaging分类
航空航天引用本文复制引用
张雅茹,陈志扬,李元昊..星地双基地SAR观测模式与成像处理研究[J].上海航天（中英文）,2026,43(2):28-36,9.基金项目
国家自然科学基金资助项目(62471042) （62471042）
