Comparison of synthetic-aperture radar autofocus techniques: phase gradient versus subaperture

Terry M. Calloway; Charles V. Jakowatz Jr.; Paul A. Thompson; Paul H. Eichel

doi:10.1117/12.49837

1 December 1991 Comparison of synthetic-aperture radar autofocus techniques: phase gradient versus subaperture

Terry M. Calloway, Charles V. Jakowatz Jr., Paul A. Thompson, Paul H. Eichel

Proceedings Volume 1566, Advanced Signal Processing Algorithms, Architectures, and Implementations II; (1991) https://doi.org/10.1117/12.49837
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Terry M. Calloway, Charles V. Jakowatz Jr., Paul A. Thompson, and 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); https://doi.org/10.1117/12.49837

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