Spotlight-mode SAR data focusing using a modified wavenumber domain algorithm

In this paper, a modified version of the wavenumber domain algorithm (MWDA) is analytically presented and formulated. It is capable of processing the spotlight-mode SAR data. MWDA combines the high accurate focusing of the wavenumber domain algorithm (which is also called range migration algorithm) and the interpolation-free requirement. To avoid costly interpolation manipulation, the inverse scaled Fourier transform (ISFT) is substituted for Stolt mapping. The subaperture processing is used to circumvent the limitation that the pulse repetition frequency (PRF) is not high enough to sample the signal in azimuth.

[1]  R. Keith Raney,et al.  Precision SAR processing using chirp scaling , 1994, IEEE Trans. Geosci. Remote. Sens..

[2]  Alberto Moreira,et al.  Spotlight SAR processing using the extended chirp scaling algorithm , 1997, IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development.

[3]  M. Jin.  High quality spotlight SAR processing algorithm designed for LightSAR mission , 1997, IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development.

[4]  Riccardo Lanari,et al.  Synthetic Aperture Radar Processing , 1999 .

[5]  Ian G. Cumming,et al.  Interpretations of the omega-K algorithm and comparisons with other algorithms , 2003, IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477).

[6]  Alberto Moreira,et al.  Reduction of phase errors arising from the approximations in the chirp scaling algorithm , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).