Volume 25 Issue 2
Feb.  1999
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Li Liwei, Mao Shiyi. Analysis on Phase Gradient Algorithm in DiscreteDomain and Implementation[J]. Journal of Beijing University of Aeronautics and Astronautics, 1999, 25(2): 125-129. (in Chinese)
Citation: Li Liwei, Mao Shiyi. Analysis on Phase Gradient Algorithm in DiscreteDomain and Implementation[J]. Journal of Beijing University of Aeronautics and Astronautics, 1999, 25(2): 125-129. (in Chinese)

Analysis on Phase Gradient Algorithm in DiscreteDomain and Implementation

  • Received Date: 28 Oct 1997
  • Publish Date: 28 Feb 1999
  • Usual autofocus techniques are based on low order phase error model, and they can only estimate low order phase error, therefore they can not be fit for high resolution airborne SAR(Synthetic Aperture Radar). The PGA(Phase Gradient Autofocus) presented in this paper is uniquely not phase-error-model-based, so it has a well-deserved reputation for arbitrarily high order autofocus. This paper researches on PGA and its implementation in discrete domain, analyzes and summarizes correlative problems. Finally, some experimental results are given to compare PGA with mapdrift autofocus which is based on limited order phase error estimation.

     

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  • 1. Ghiglia D C, Wahl D E, Eichel P H. Some methods for reducingpropagation-induced phase errors in coherent imaging systems(II. Numerical results). Opt Society of America, 1988,5(6):942~957 2. Brown W D, Ghiglia D C. Some methods for reducing propagation-induced phase errors in coherent imaging systems(I. Formalism). Opt Society of America, 1988, 5(6):924~941 3. Mancill J M, Hooklee D C. A map drift autofocus technique for correcting higher order SAR phase errors(U). In:Proceedings of 27th Tri-Service Radar Conference. California:Monterey,1981.23~25 4. Jakowatz C V.Spotlight-mode synthetic aperture radar:a signal processing approach. Boston:Dordrecht,1996.251~271 5. Wahl D E, Eichel P H, Ghiglia D C, et al. Phase gradient autofocus—a robust tool for high resolution SAR phase correction. IEEE Trans on AES, 1994,30(3): 827~835 6. Eichel P H, Ghiglia D C. Speckle processing method for synthetic-aperture-radar phase correction. Opt Society of America, 1989, 14(1):1~3 7. Eichel P H,Wahl D E. Phase gradient algorithms as an optimal estimator of the phase derivative. Opt Society of America,1989,14(20):1101~1103
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