DocumentCode :
1500776
Title :
A new fast method for the reconstruction of 2-D microwave images of rotating objects
Author :
Berizzi, Fabrizio ; Corsini, Giovanni
Author_Institution :
Dipt. di Ingegneria dell´´Inf., Elettronica, Inf., Telecommun., Pisa Univ., Italy
Volume :
8
Issue :
5
fYear :
1999
fDate :
5/1/1999 12:00:00 AM
Firstpage :
679
Lastpage :
687
Abstract :
The problem of microwave imaging of rotating objects is approached from a digital signal processing point of view. Attention is focused on the reconstruction of the two-dimensional (2-D) image of an object obtained by processing complex samples of the continuous wave (CW) signal return received for different object aspect angles covering a 2π total variation. The effects of a polar sampling of the Fourier transform (FT) of the target reflectivity function on the impulse response of the imaging system are analyzed. A criterion for the choice of the angular sampling interval in order to control the image blurring is given. Finally, a new and fast digital signal processing method for image reconstruction is proposed. This method reconstructs high resolution images of rotating targets illuminated by a CW electromagnetic signal or by a large bandwidth transmitted signal. This algorithm is suitable for processing wideband received signal of targets observed for a large variation of the viewing angle, so it is very attractive for the reconstruction of very high spatial resolution target images in SAR/ISAR systems. To show the performance of the method we finally present and discuss the results obtained by applying the proposed technique on simulated and experimental data
Keywords :
CW radar; Fourier transforms; image reconstruction; image sampling; inverse problems; microwave imaging; radar imaging; radar resolution; synthetic aperture radar; 2D microwave image reconstruction; CW electromagnetic signal; Fourier transform; SAR/ISAR systems; angular sampling interval; complex samples; continuous wave signal return; digital signal processing; experimental data; fast DSP method; high resolution images; image blurring control; imaging system; impulse response; large bandwidth transmitted signal; microwave imaging; object aspect angles; polar sampling; rotating objects; rotating targets; simulated data; target reflectivity function; viewing angle variation; wideband received signal; Digital signal processing; Fourier transforms; Image reconstruction; Image sampling; Microwave imaging; Microwave theory and techniques; Signal processing; Signal sampling; Spatial resolution; Two dimensional displays;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/83.760335
Filename :
760335
Link To Document :
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