一種實用的合成孔徑雷達自聚焦算法
A Practical Autofocus Algorithm for SAR
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摘要: 該文提出了一種實用的改進型自聚焦算法--迭代平移相關法。與原來的平移相關法相比,該改進型算法通過適當?shù)牡\算,并結合新的估計加權因子和窗寬自動選擇功能,可在初始速度誤差較大的情況下獲得更為準確的估計值。理論分析及試驗結果表明,迭代平移相關法可以在運算量增加不大的情況下獲得更可靠的速度誤差估計結果。Abstract: A practical modified autofocus algorithm for synthetic aperture radar, the iterative shift-and-correlation algorithm, is presented, Comparing with the original shift-and-correlation algorithm, the modified one can obtain more accurate estimations in worse case by incorporating the appropriate iterations, the new weightings and the auto-selecting width of the detecting window. Both the theoretical analyses and the test results indicate that the iterative shift-and-correlation algorithm can obtain more reliable results with a cost of slight increment of the computational complexity.
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Franceschetti G, Lannari R. Synthetic Aperture Radar Processing.Boca Raton, London, New York, Washington DC, CRC Press,1999, Chapter 3.[2]Curlander J C, Wu C, Pang A. Automated processing of spaceborne SAR data. Proceedings of IGARSS82, Munich, Jun.1982:FA-1/3.11 - 6.[3]Berizzi F, Corsini G, Diani M, et al.. Autofocus of wide azimuth angle SAR images by contrast optimisation. Proceedings of IGARSS96, Nebrasca, Jun 1996:1230 - 1232.[4]WAHL D E, et al.. Phase gradient autofocus-A robust tool for high resolution SAR phase correction[J].IEEE Trans. on Aerospace and Electronic Systems.1994, 30(3):827-[5]Dali J. A new frequency domain autofocus algorithm for SAR[J].Proceedings of IGARSS91, Heisinki, Jun.1991, Vol.2:1069-1072[6]Dali J. A fast autofocus algorithm for synthetic aperture radar processing. IEEE International Conference on Acoustics, Speech,and Signal Processing (ICASSP-92), San Francisco, Mar. 1992,part Ⅲ: 5-8. -
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