Title :
Wide-angle ISAR passive imaging using smoothed pseudo Wigner-Ville distribution
Author :
Wu, Yong ; Munson, David C., Jr.
Author_Institution :
Coordinated Sci. Lab. & Dept. Elec. & Comput. Eng., Illinois Univ., Urbana, IL, USA
Abstract :
We are investigating passive radar imaging of aircraft using reflected TV signals. UHF-band ISAR imaging requires wide-angle data to produce good cross-range resolution. We show that direct Fourier reconstruction (DFR) causes degradation of the reconstructed image due to aspect-dependent scattering. We find that a smoothed pseudo Wigner-Ville distribution (SPWVD) applied in the cross-range direction in place of the Fourier transform can generate a sequence of images, which shows the target reflectivity as a function of aspect angle. Compared to DFR results, these images have higher cross-range resolution. A final image can be synthesized from these images and used for target recognition. XPATCH is used to simulate monostatic data from an aircraft. The proposed SPWVD-based imaging method produces a useful image of the aircraft from this data
Keywords :
Wigner distribution; electromagnetic wave reflection; electromagnetic wave scattering; image reconstruction; image sequences; radar imaging; radar resolution; radar target recognition; synthetic aperture radar; UHF-band ISAR; XPATCH; aircraft; aspect angle; aspect-dependent scattering; cross-range resolution; direct Fourier reconstruction; image reconstruction; image sequence; monostatic data simulation; passive radar imaging; reflected TV signals; smoothed pseudo Wigner-Ville distribution; target recognition; target reflectivity; wide-angle ISAR; Aircraft; Degradation; Fourier transforms; Image reconstruction; Image resolution; Passive radar; Radar scattering; Reflectivity; Signal resolution; TV;
Conference_Titel :
Radar Conference, 2001. Proceedings of the 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-6707-3
DOI :
10.1109/NRC.2001.923006