Range dependent phase gradient autofocus

D.G Thompson,A Robertson,D.G Long,D.V Arnold,J.S Bates

doi:10.1109/igarss.1998.702303

Range dependent phase gradient autofocus

D.G Thompson, A Robertson + Show 3 more

Open Access

https://doi.org/10.1109/igarss.1998.702303

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Publication Date: Jan 1, 1998

Citations: 7

Affiliation: Brigham Young University

#Phase Gradient Autofocus Algorithm #Phase Gradient Autofocus + Show 8 more

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Abstract

The Phase Gradient Autofocus (PGA) algorithm has been widely used in spotlight synthetic aperture radar (SAR) to remove motion-induced blurs in the images. The PGA algorithm has been proven to be a superior autofocus method. PGA assumes a narrow beam, which is valid for most SAR systems. However, lower altitude SARs have large range dependencies that cannot be ignored. A new phase estimator for PGA is introduced and extended to allow range dependence An ERS-1 image of Death Valley is used in simulations comparing the new estimator to the widely used maximum likelihood approach and in demonstrating the range-dependent PGA algorithm.

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