Title :
A Discrete Wavelet Transform Approach to Multiresolution Complex SAR Image Generation
Author :
Bhattacharya, C. ; Mahapatra, P.R.
Author_Institution :
Defence Electron. Applic. Lab., Defence R&D Organ., Dehradun
fDate :
7/1/2007 12:00:00 AM
Abstract :
We present a signal processing approach using discrete wavelet transform (DWT) for the generation of complex synthetic aperture radar (SAR) images at an arbitrary number of dyadic scales of resolution. The method is computationally efficient and is free from significant system-imposed limitations present in traditional subaperture-based multiresolution image formation. Problems due to aliasing associated with biorthogonal decomposition of the complex signals are addressed. The lifting scheme of DWT is adapted to handle complex signal approximations and employed to further enhance the computational efficiency. Multiresolution SAR images formed by the proposed method are presented.
Keywords :
discrete wavelet transforms; geophysical signal processing; geophysical techniques; synthetic aperture radar; SAR images generation; biorthogonal decomposition; computational efficiency; discrete wavelet transform approach; dyadic scales; lifting scheme; signal processing approach; subaperture-based multiresolution image formation; synthetic aperture radar; Azimuth; Discrete wavelet transforms; Image analysis; Image generation; Image resolution; Multiresolution analysis; Signal generators; Signal resolution; Spatial resolution; Synthetic aperture radar; Discrete wavelet transform (DWT); lifting scheme; multiresolution SAR images; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2007.895673
