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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.i2.90
pages 169-177

MULTI-LOOK RADIOMETRIC CORRECTION OF SAR IMAGES

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
V. V. Vinogradov
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

Deviations of the aircraft trajectory and instabilities of the aircraft orientation lead to non-uniform illumination of the ground by the antenna beam and, as a result, to radiometric errors in radar images obtained with airborne synthetic aperture radars (SAR). The clutter-lock technique is commonly used to avoid the radiometric errors. However, this approach leads to strong geometric distortions in SAR images in the case of fast and significant instabilities of antenna orientation. Here we propose a multi-look radiometric correction technique which can be used instead of the clutter-lock. The proposed approach has been tested by using a Ku-band airborne SAR system onboard light-weight aircraft.


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