Synthetic-aperture radar autofocus by maximizing sharpness.

  title={Synthetic-aperture radar autofocus by maximizing sharpness.},
  author={James R. Fienup},
  journal={Optics letters},
  volume={25 4},
To focus a synthetic-aperture radar image that is suffering from phase errors, a phase-error estimate is found that, when it is applied, maximizes the sharpness of the image. Closed-form expressions are derived for the gradients of a sharpness metric with respect to phase-error parameters, including both a point-by-point (nonparametric) phase function and coefficients of a polynomial expansion. Use of these expressions allows for a highly efficient gradient-search algorithm for high-order phase… CONTINUE READING
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