IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION

Li Liwei; Asif Raza; Mao Shiyi

Volume 21 Issue 6

Nov. 1999

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Li Liwei, Asif Raza, Mao Shiyi. IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION[J]. Journal of Electronics & Information Technology, 1999, 21(6): 771-778.

Citation:

Li Liwei, Asif Raza, Mao Shiyi. IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION[J]. Journal of Electronics & Information Technology, 1999, 21(6): 771-778.

Li Liwei, Asif Raza, Mao Shiyi. IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION[J]. Journal of Electronics & Information Technology, 1999, 21(6): 771-778.

Citation:

Li Liwei, Asif Raza, Mao Shiyi. IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION[J]. Journal of Electronics & Information Technology, 1999, 21(6): 771-778.

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IMPROVEMENT OF AUTOFOCUSING TECHNIQUE FOR RANK ONE PHASE ERROR ESTIMATION

Received Date: 1998-02-27
Rev Recd Date: 1998-11-05
Publish Date: 1999-11-19

Abstract

Abstract

This paper presents an improved rank one phase error estimation(ROPE) autofo-cusing technique. Compared with ROPE, the improved algorithm has two distinct advantages: first, its model is more actual, so its property of robustness is better; second, at the begining of its iteration process, the initialized valves are set up approximately. Through approximate analysis, this paper proves that the improved algorithm s estimation of phase error is maximum-likelihood (ML), and, under some special situaitons, its estimation is the same as that of phase gradient autofocus (PGA), which is linear unbiased minimum variance (LUMV) estimation. PGA is a subset of this improved autofocus algorithm. Finally, some simulation results are given.

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References(1)

References

Carrara W G, Goodman R S, Majewski R M. Spotlight synthetic Aperture Radar Signal Pro[2]cessing Algorithms. Artech House, Boston, London: 1995, 203-243.[3]Ghiglia D C, Brown W D. Some methods for reducing propagation-induced phase errors in coherent imaging systems. II. Numerical results. Optical Society of America,1988,5(6): 942-957.[4]Brown W D, Ghiglia D C. Some methods for reducing propagationinduced phase errors in coherent imaging systems. I. Formalism. Optical Society of America. 1988, 5(6): 924-941.[5]Snarski C A. Rank one phase error estimation for range-Doppler imaging. IEEE Trans. on AES 1996, AES-32(2): 676-688.[6]Wahl D E, et al. Phase gradient autofocus-A robust tool for high resolution SAR phase correction. IEEE Trans on AES, 1994, AES-30(3): 827-835.[7]Eichel P H,et al.Phase gradient algorithms as an optimal estimator of the phase derivative Optical Society of America; 1989, 14(20): 1101-1103.

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