Title :
A directional image decomposition for ultra-wideband SAR
Author :
Rau, Richard ; McClellan, James H.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper presents a theoretical analysis of the structure of wide angle, ultra-wideband SAR images formed by a constant integration angle backprojection image former. It is shown that the effects of the image former can be modeled as a filtering operation on the original data. Furthermore, SAR images for different squint angles can be obtained from the original images by directional filtering. As a result, it is shown that perfect reconstructing directional filterbanks can be used as a unitary transform between SAR images and a 3-D representation containing additional aspect-angle information. It is demonstrated, how this new representation can be used to enhance targets
Keywords :
band-pass filters; image enhancement; image reconstruction; image representation; radar imaging; synthetic aperture radar; transforms; 3-D representation; aspect-angle; constant integration angle backprojection image former; directional filtering; directional image decomposition; filtering operation; perfect reconstructing directional filterbanks; squint angles; target enhancement; ultra-wideband SAR; unitary transform; Data mining; Filtering; Fourier transforms; Geometry; Image decomposition; Image processing; Radar antennas; Signal processing; Strips; Ultra wideband technology;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.678126
