Improving SAR images: Built-in geometric and multi-look radiometric corrections

Author

Bezvesilniy, O.O. ; Gorovyi, Ie M. ; Sosnytskiy, S.V. ; Vynogradov, V.V. ; Vavriv, D.M.

Author_Institution

Dept. of Microwave Electron., NAS of Ukraine, Kharkov, Ukraine

fYear

2010

fDate

Sept. 30 2010-Oct. 1 2010

Firstpage

256

Lastpage

259

Abstract

SAR systems installed on small aircrafts and UAVs suffer from trajectory deviations and instabilities of antenna orientation. These kinds of motion errors lead to significant geometric distortions and radiometric errors in SAR images. In the paper, we describe a time-domain multi-look stripmap SAR processing algorithm with built-in geometric and multi-look radiometric corrections. Geometric correction is performed due to azimuth reference functions and range migration curves specially designed to produce SAR images directly on a rectangular grid on the ground plane. Radiometric correction is based on multi-look processing with extended number of looks. The proposed techniques have been successfully tested with a Ku-band SAR system installed on a light-weight aircraft.

Keywords

aircraft antennas; geometry; radar imaging; radiometry; synthetic aperture radar; SAR systems; antenna orientation; azimuth reference functions; built-in geometric corrections; light-weight aircraft; multilook radiometric corrections; range migration curves; time-domain multilook stripmap SAR processing algorithm; Aircraft; Antennas; Azimuth; Doppler effect; Radiometry; Synthetic aperture radar; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Radar Conference (EuRAD), 2010 European

Conference_Location

Paris

Print_ISBN

978-1-4244-7234-5

Type

conf

Filename

5614898