A SAR Signal Processing Algorithm using Wavenumber Domain

  • Won, Joong-Sun (Marine Geology Laboratory, Korea Ocean Research and Development Institute) ;
  • Yoo, Hong-Ryong (Marine Geology Laboratory, Korea Ocean Research and Development Institute) ;
  • Moon, Wooil-M. (Department of Geological Science, University of Manitoba)
  • Published : 1994.06.01

Abstract

Since Seasat SAR mission in 1978, SAR has become one of the most important surface imaging tools in satellite remote sensing SAR achieves high resolution by signal processing synthesizing a larger aperture. Therefore, SAR signal processing along with antenna technology has been centered upon SAR technologies. Thus interpreters of SAR imagery as well as those who involved in signal processing require the knowledge of the principal SAR processing algorithm. Although the conventional range-Doppler approach has been widely adopted by many SAR processors, azimuth compression including the range migration has been problematic. The recent development of the wavenumber domain approace is able to provide high precision SAR focusing algorithm. Compared with the wavenumber domain algorithm derived by applying Born (first) approximation, the transfer function of the conventional range-Doppler algorithm accounts only for the first order approximation of the exact transfer function. The results of a simulation and an actual test using airborne C-band SAR configuration demonstrate the dxcellent performance of the wavenumber domain algorithm.

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