一種用于條帶式SAR的自聚焦算法
A New Approach to Autofocus Considering Strip M ap SAR
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摘要: 本文將相位梯度法（Phase Gradient Algorithm，PGA）用于條帶式合成孔徑雷達(dá)（SAR）的自聚焦。根據(jù)條帶SAR與聚束SAR回波信號(hào)差異并參考經(jīng)典相位梯度法提出了一種適用于條帶SAR的自聚焦算法SPGA。用這種新的條帶SAR自聚焦算法聚焦所得SAR圖像不會(huì)發(fā)生傳統(tǒng)條帶SAR下PGA常有的拼接問題：同時(shí)由于相位誤差曲面的引入，對于任何場景SPGA均能達(dá)到良好的聚焦效果。
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關(guān)鍵詞:
- 合成孔徑雷達(dá);條帶式; 自聚焦; 相位梯度法
Abstract: Phase Gradient Algorithm （PGA） is accomodated to focus the StripMap SAR data in this article. A new approach to StripMap SAR autofocus, StripMap PGA（SPGA）, is developed based on the difference between the received signal of StripMap SAR and SpotLight SAR and the classic PGA is referenced. The focused SAR images from SPGAdoes not have the problem of the shift between the blocks which can be found in the images from the traditional StripMap autofocus method. SPGA can get well focused SAR images from more universal scene because of the employment of phase error surface. -
Eichel P H, Ghiglia D C, Jakowatz Jr C V. Speckle processing method for synthetic-aperture-radar phase correction[J].Optics Letters.1989, 14 (1):1-3[2]WAHL D E, Jakowatz. Jr C V, Thompson P A. New approach to StripMap SAR autofocus. Proceedings of the 1994 6th IEEE Digital Signal Processing Workshop, Yosemite California, Oct.1994:53 - 56.[3]Thompson D G, Bates J S, Arnold D V, Long D G. Extending the phase gradient autofocus algorithm for low-altitude StripMap mode SAR. Proceedings of the 1999 IEEE Radar Conference,Boston, Apr. 1999:36- 40.[4]郭智.高分辨率機(jī)載SAR運(yùn)動(dòng)補(bǔ)償研究與系統(tǒng)實(shí)現(xiàn).[博士論文],中國科學(xué)院電子學(xué)研究所,2003年5月.[5]WAHL D E, Eichel P H, Ghiglia D C. Phase gradient autofocus- a robust tool for high resolution SAR phase correction[J].IEEE Trans. on Aerospace and Electronic Systems.1994, 30(3):827-835[6]張澄波.綜合孔徑雷達(dá)原理、系統(tǒng)分析與應(yīng)用.北京:科學(xué)出版社,1989年11月,第3,4章. -
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