Autofocus Algorithm of High Resolution SAR Based on Polar Format Algorithm Processing

Zeng Le-tian; Liang Yi; Xing Meng-dao

doi:10.11999/JEIT141131

Volume 37 Issue 6

Jun. 2015

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Zeng Le-tian, Liang Yi, Xing Meng-dao. Autofocus Algorithm of High Resolution SAR Based on Polar Format Algorithm Processing[J]. Journal of Electronics & Information Technology, 2015, 37(6): 1409-1415. doi: 10.11999/JEIT141131

Citation:

Zeng Le-tian, Liang Yi, Xing Meng-dao. Autofocus Algorithm of High Resolution SAR Based on Polar Format Algorithm Processing[J]. Journal of Electronics & Information Technology, 2015, 37(6): 1409-1415. doi: 10.11999/JEIT141131

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Autofocus Algorithm of High Resolution SAR Based on Polar Format Algorithm Processing

doi: 10.11999/JEIT141131

Received Date: 2014-08-27
Rev Recd Date: 2014-12-08
Publish Date: 2015-06-19

Abstract

Abstract

Equipped with an airborne spotlight SAR, inertia navigation system can not measure the motion errors with the required accuracy for high resolution SAR imaging, which may degrade severely the quality of a SAR image. In this paper, a novel autofocus algorithm that can be directly embedded in Polar Format Algorithm (PFA) is proposed, that is, a Hybrid Multistage Parameterized Minimum Entropy (HMPME) algorithm to proceed Range Cell Migration (RCM) correction and a scaled-stepsize iterative phase correction method based on Contrast Enhancement (CE). The autofocus processing accurately compensates the effects of range cell migration and phase errors. Also, this algorithm is most robust in processing images of low contrast and low signal-to-noise ratio. Finally, simulations and experiments with real spotlight SAR data validate the effectiveness of the proposed algorithm.
- SAR,
- Polar Format Algorithm (PFA),
- Autofocus,
- Parameterized minimum entropy,
- Contrast enhancement

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References(14)

References

张磊. 高分辨SAR/ISAR成像及误差补偿技术研究[D]. [博士论文], 西安电子科技大学, 2012.

Zhang Lei. Study on high resolution SAR/ISAR imaging and error correction[D]. [Ph.D. dissertation], Xidian University, 2012.

Yang Lei, Xing Meng-dao, Wang Yong, et al.. Compensation for the NsRCM and phase error after polar format resampling for airborne spotlight SAR raw data of high resolution[J]. IEEE Geoscience and Remote Sensing Letters, 2013, 10(1): 165-169.

Carrara G, Goodman S, and Majewski M. Spotlight Synthetic Aperture Radar: Signal Processing Algorithm[M]. Boston, MA: Artech House, 1995: 200-244.

Xu Gang, Xing Meng-dao, Zhang Lei, et al.. Robust autofocusing approach for highly squinted SAR imagery using the extended wavenumber algorithm[J]. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(10): 5031-5046.

黄大荣, 张磊, 邢孟道, 等. 基于加权最大范数的SAR自聚焦方法[J].?电子与信息学报,?2014,?36(1):?202-208.

Huang Da-rong, Zhang Lei, Xing Meng-dao, et al.. A weighted maximize norm method for SAR autofocus[J]. Journal of Electronics Information Technology, 2014, 36(1): 202-208.

Wahl D E, Eichel P H, Ghiglia D C, et al.. Phase gradient autofocus-a robust tool for high resolution phase correction[J]. IEEE Transactions on Aerospace and Electronic Systems, 1994, 30(3): 827-835.

Ye Wei, Yeo T S, and Bao Zheng. Weighted least-squares estimation of phase errors for SAR/ISAR autofocus[J]. IEEE Transactions on Geoscience and Remote Sensing, 1999, 37(5): 2487-2494.

Xiong Tao, Xing Meng-dao, Wang Yong, et al.. Minimum- entropy-based autofocus algorithm for SAR data using Chebyshev approximation and method of series reversion, and its implementation in a data processor[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(3): 1719-1728.

Gao Yang, Yu Wei-dong, Liu Ya-bo, et al.. Sharpness-based autofocus for stripmap SAR using an adaptive-order polynomial model[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 11(6): 1086-1090.

Doerry A W. Autofocus correction of excessive migration in synthetic aperture radar images[R]. Sandia Laboratory, 2004.

Thomas K J and Alaa K A. Monotonic iterative algorithm for minimum-entropy autofocus[C]. IEEE International Conference on Image Processing, Atlanta, USA, 2006: 645-648.

Josse K. Image reconstruction and restoration using constrained optimization algorithms[D]. [Ph.D. dissertation], Purdue University, 1996.

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