利用頻譜合成實現(xiàn)分布式衛(wèi)星SAR高距離分辨力成像
Distributed Satellites SAR High Range Resolution Imaging Using Spectral Synthesis
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摘要: 在正側視模式下,以不同視角對同一地域進行觀測可獲得多組回波數(shù)據(jù),通過對多組回波數(shù)據(jù)的綜合處理可提高SAR的距離向分辨力。該文研究了由收發(fā)分置平臺以不同視角、不同觀測模式(正側視和斜視)對同一地域進行觀測獲取的多組回波數(shù)據(jù),指出由于雷達天線波束中心與衛(wèi)星垂直軌道面夾角的不同,導致回波信號所處頻段的不同;通過對不同頻段回波信號的頻譜合成可提高距離向分辨力。此外,該文還討論了分布式衛(wèi)星SAR 系統(tǒng)的一些參數(shù)對頻譜合成的影響。Abstract: Different data sets relative to the same scene acquired with different view angles can be exploited to improve slant-range resolution of SAR in broadside mode. Distributed satellites SAR is a special kind of SAR system, whose transmitters and receivers are placed separately and work in different mode (broadside mode and squint mode). In this paper, data sets acquired from distributed satellites SAR system is discussed. It points out that, different angles between the radar Line Of Sight (LOS) and the satellites vertical orbital plane correspond to different bands of the ground reflectivitys spectrum. Therefore, the range resolution can be improved by using combined spectra. In addition, the influence of distributed satellites SAR systems parameters on spectral synthesis is also discussed.
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王巖飛,張冰塵,廖蜀燕,等.分布式小衛(wèi)星合成孔徑雷達綜合成像系統(tǒng)方案研究.微小衛(wèi)星編隊飛行及應用論文集,北京,2000,7:103-114.[2]Prati C, Rocca F. Improving slant-range resolution with multiple SAR surveys. IEEE Trans. on Geosci. Remote Sens., 1993, 29(1):135 - 143.[3]Fornaro G, Pascazio V, Schirinzi G. Resolution improvement via multipass SAR imaging, IGARSS2001, Sydney (AUS), July 2001, 6:2734 - 2736.[4]林來興.微小衛(wèi)星編隊飛行組成虛擬衛(wèi)星研究.微小衛(wèi)星編隊飛行及應用論文集,北京,2000,7:1-35. -
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