1 December 1991 Comparison of synthetic-aperture radar autofocus techniques: phase gradient versus subaperture
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Two methods of focusing synthetic aperture radar (SAR) images are compared. Both a conventional subaperture cross-correlation method and a new phase gradient autofocus (PGA) algorithm developed at Sandia National Laboratories are shown to perform well if high-order phase errors are not present. With the introduction of significant high-order phase errors [e.g., due to uncompensated platform motion], both algorithms suffer a loss in performance. However, relative performance degradation is less for PGA than for the subaperture focusing technique. An explanation is presented for the observed behavior of the two autofocus techniques.
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Terry M. Calloway, Terry M. Calloway, Charles V. Jakowatz, Charles V. Jakowatz, Paul A. Thompson, Paul A. Thompson, Paul H. Eichel, Paul H. Eichel, "Comparison of synthetic-aperture radar autofocus techniques: phase gradient versus subaperture", Proc. SPIE 1566, Advanced Signal Processing Algorithms, Architectures, and Implementations II, (1 December 1991); doi: 10.1117/12.49837; https://doi.org/10.1117/12.49837

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