Noniterative Super-Resolution Technique Combining SVA With Modified Geometric Mean Filter

We propose a super-resolution algorithm that combines spatially variant apodization (SVA) with a modified geometric mean filter to improve the resolution of synthetic aperture radar (SAR) images and reduce sidelobes simultaneously. This method does not require iterative calculation. The efficacy of the proposed algorithm is verified by simulation with point targets and in experiments with a real SAR image. The proposed method improved resolution by 40% compared to SVA and phase-extension inverse filtering.

[1]  Anil K. Jain.  Fundamentals of Digital Image Processing , 2018, Control of Color Imaging Systems.

[2]  Laurent Ferro-Famil,et al.  Range resolution improvement of airborne SAR images , 2006, IEEE Geoscience and Remote Sensing Letters.

[3]  Hee-Young Lee,et al.  A Modified Subpulse SAR Processing Procedure Based on the Range-Doppler Algorithm for Synthetic Wideband Waveforms , 2008, Sensors.

[4]  N. Hamano,et al.  Digital processing of synthetic aperture radar data , 1984 .

[5]  Ram M. Narayanan,et al.  Enhanced resolution in SAR/ISAR imaging using iterative sidelobe apodization , 2005, IEEE Transactions on Image Processing.

[6]  H. C. Stankwitz,et al.  Sparse aperture fill for SAR using super-SVA , 1996, Proceedings of the 1996 IEEE National Radar Conference.

[7]  Etienne Barnard,et al.  Two-dimensional superresolution radar imaging using the MUSIC algorithm , 1994 .

[8]  Woo-Jin Song,et al.  SAR Image Enhancement Based on Phase-Extension Inverse Filtering , 2000 .

[9]  Young-Soo Kim,et al.  Automobile-based SAR/InSAR system for ground experiments , 2006, IEEE Geoscience and Remote Sensing Letters.

[10]  Stuart R. DeGraaf,et al.  Sidelobe reduction via adaptive FIR filtering in SAR imagery , 1994, IEEE Trans. Image Process..

[11]  John C. Curlander,et al.  Synthetic Aperture Radar: Systems and Signal Processing , 1991 .

[12]  Stuart R. DeGraaf,et al.  SAR imaging via modern 2-D spectral estimation methods , 1998, IEEE Trans. Image Process..

[13]  James R. Fienup,et al.  Nonlinear apodization for sidelobe control in SAR imagery , 1995 .

[14]  Alberto Moreira,et al.  On the use of the ideal filter concept for improving SAR image quality , 1995 .