圆迹SAR极坐标格式算法研究

林赟; 谭维贤; 洪文; 王彦平; 吴一戎

doi:10.3724/SP.J.1146.2010.00003

圆迹SAR极坐标格式算法研究

doi: 10.3724/SP.J.1146.2010.00003

林赟^{①②③ 谭维贤,},
谭维贤,
洪文,
王彦平,
吴一戎

基金项目:

国家自然科学基金(60890070)，国家杰出青年基金(60725103)资助课题

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出版历程
- 收稿日期: 2010-01-04
- 修回日期: 2010-06-01
- 刊出日期: 2010-12-19

Polar Format Algorithm for Circular Synthetic Aperture Radar

Lin Bin^{①②③ 谭维贤
,},
Tan Wei-Xian,
Hong Wen,
Wang Yan-Ping,
Wu Yi-Rong

摘要

摘要: 该文提出一种新的用于圆迹合成孔径雷达(Circular Synthetic Aperture Radar, CSAR)成像的极坐标格式算法。在CSAR模式下，点目标的波数域3维频谱为3维曲面。根据这一特点，算法采用逐高度平面成像的方法最终获得3维图像，即通过参考函数相乘，将频谱投影到2维平面，既避免了高度向的插值，又保证了算法的精确性。并且该算法通过两步相位补偿操作校正了越距离单元徙动的高次项，扩大了有效成像范围，避免了场景边缘目标的散焦。最后，点目标仿真验证了该算法的有效性。
- 合成孔径雷达 /
- 圆迹合成孔径雷达 /
- 极坐标格式算法 /
- 成像算法
Abstract: In this paper, a novel Polar Format Algorithm (PFA) is presented for Circular Synthetic Aperture Radar (CSAR) imaging. Based on the signal model analysis, it is finded that the shape of the spectrum in the wavenumber domain of a point target in CSAR is a three-dimensional curved surface. To avoid the interpolation along the third dimension and also ensure accuracy, this algorithm obtains two-dimensional images at equally spaced heights to form the final three-dimensional image, and this is done by multiplying reference function of height to project the spectrum to two-dimensional planes. By two steps of phase compensation, this algorithm also corrects the high terms of the Range Cell Migration (RCM) to enable full image quality over much larger scenes without image defocus. Finally, simulation results validate the feasibility of the proposed approach.
- Synthetic Aperture Radar (SAR) /
- Circular SAR /
- Polar Format Algorithm (PFA) /
- Imaging algorithm

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参考文献(1)

Cumming I G, and Wong F H著. 洪文, 胡东辉译. 合成孔径雷达成像算法与实现[M]. 北京：电子工业出版社, 2007, 第4章.[2]Knaell K. Three-dimensional SAR from practical apertures[C][J].SPIE.1995, 2562:31-41[3]Soumekh M. Reconnaissance with slant plane circular SAR imaging[J].IEEE Transactions on Image Processing.1996, 5(8):1252-1265[4]Ishimaru A, Chan T, and Kuga Y. An imaging technique using confocal synthetic aperture radar[J].IEEE Transactions on Geoscience and Remote Sensing.1998, 36(5):1524-1530[5]Ferrara M, Jackson J A, and Austin C. Enhancement of multi-pass 3D circular SAR images using sparse reconstruction techniques[C]. Algorithms for Synthetic Aperture Radar Imagery XVI, Proceedings of SPIE, 2009: 7337-02.[6]Soumekh M. Synthetic Aperture Radar Signal Processing[M]. New York.[J].NY: John Wiley Sons, Inc.1999,:-[7]Hurbert M J and Cantalloube E C. Airborn SAR imaging along a circular trajectory[C]. EUSAR, Dresden, Germany, May 16-18, 2006.[8]Hubert M J, Cantalloube E C, and Koeniguer H O. High resolution SAR imaging along circular trajectories[C]. IGRASS, Barcelona, Spain, July 23-27, 2007: 2259-2262.[9]Pinheiro M, Prats P, and Scheiber R, et al.. Tomographic 3D reconstruction from airborn circular SAR[C]. IGARSS, Cape Town, South Africa, July 12-17, 2009: Ⅲ 21-24.[10]Burki J and Barnes C F. Slant Plane CSAR processing using householder transform[J].IEEE Transactions on Image Processing.2008, 17(10):1900-1907[11]孙进平，白霞，毛士艺. 聚束模式双基地SAR极坐标格式成像算法研究[J]. 电子学报, 2008, 36(12): 2324-2327.Sun Jin-ping, Bai Xia, and Mao Shi-yi. The PFA imaging algorithm for spotlight mode bistatic SAR[J]. Acta Electronics Sinica, 2008, 36(12): 2324-2327.[12]保铮, 邢孟道, 王彤. 雷达成像技术[M]. 北京: 电子工业出版社, 2004: 177-180.[13]Fortuny J. Efficient alorithms for three-dimentional near-field synthetic aperture radar imaging[D]. [Ph.D. dissertation], University of Karslruhe, 2001.

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