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Radio Physics and Radio Astronomy

ISSN Imprimir: 2152-274X
ISSN On-line: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i4.100
pages 365-375

LOCAL-QUADRATIC MAP-DRIFT AUTOFOCUS FOR SYNTHETIC APERTURE RADARS

O. O. Bezvesilniy
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
I. M. Gorovyi
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
Dmitry M. Vavriv
Institute of Radio Astronomy, National Academy of Sciences of Ukraine 4, Krasnoznamennaya St., Kharkiv 61002, Ukraine

RESUMO

Uncompensated phase errors lead to quality degradation of images obtained by synthetic aperture radars (SAR). This effect becomes especially apparent in the systems with high spatial resolution. A novel approach to estimating residual phase errors in stripmap SAR signals is suggested. The idea of the method lies in estimating the local quadratic phase errors on short time intervals with the subsequent recovery of the unknown phase error on time intervals of arbitrary length. The map-drift autofocus (MDA) algorithm is used for the local estimation. The proposed method performance is demonstrated by the real radar data examples.


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