NDLI: High frequency phase errors in SAR imagery and implications for autofocus

Content Provider	IEEE Xplore Digital Library
Author	Marechal, N.
Copyright Year	1996
Description	Author affiliation: Dept. of Radar & Signals Syst., Aerosp. Corp., El Segundo, CA, USA (Marechal, N.)
Abstract	The subject of this paper is the characterization of high frequency phase errors in synthetic aperture radar (SAR) imagery formed using the polar format processing approach and the implications for autofocus. A mathematical model for the phase error is reviewed which illustrates the dependency of the phase error on range wavenumber as well as azimuth wavenumber. In the case of a single sinusoidal phase error, it is shown that the resulting paired echoes have a characteristic two-dimensional (2D) appearance. This implies that for sufficiently high phase error frequencies the associated autofocus problem is 2D, that is the phase error is a function of range and azimuth wavenumbers. Radars operating at long wavelengths and fine resolution, such as a 1 meter resolution L-band system, are the most likely candidates to produce imagery having 2D phase error.
Starting Page	1233
Ending Page	1240
File Size	728804
Page Count	8
File Format	PDF
ISBN	0780330684
DOI	10.1109/IGARSS.1996.516625
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-05-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Radar imaging Synthetic aperture radar Azimuth Jitter Image resolution Signal resolution Electromagnetic propagation Radar scattering Pulse measurements
Content Type	Text
Resource Type	Article

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