Title :
Ultra-wideband synthetic aperture radar time-frequency representation image formation
Author :
Jin, Tao ; Zhou, Zhengchun ; Chang, Wenge
Author_Institution :
Sch. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha Hunan
Abstract :
In ultra-wideband synthetic aperture radar (UWB SAR) imaging, scatterers often perform the frequency- and aspect angle-dependent reflectivity characteristic, which is usually neglected in traditional imaging processing. A novel UWB SAR time-frequency representation image formation (TFRIF) is proposed to retrieve the frequency- and aspect angle-dependent information, which is valuable in target detection. Based on the TFRIF, two fusion schemes are studied: pixel level fusion (PLF) and decision level fusion (DLF). Based on the analytical expressions, it is concluded that TFRIF can extract the reflectivity pattern information with high precision and little sacrifice of the spatial resolutions. Quantitative analyses of spatial resolutions and detectability improvement of the proposed fusion schemes are tested on airborne UWB SAR data. The real data results validate the proposed TFRIF and its associated PLF and DLF schemes
Keywords :
airborne radar; electromagnetic wave scattering; feature extraction; image representation; image resolution; radar detection; radar imaging; radar resolution; sensor fusion; synthetic aperture radar; target tracking; time-frequency analysis; ultra wideband radar; DLF; PLF; TFRIF; UWB synthetic aperture radar; airborne radar data; aspect angle-dependent information; decision level fusion; frequency-dependent information; pixel level fusion; quantitative analysis; radar scattering; reflectivity pattern extraction; spatial resolution; target detection; time-frequency representation image formation; ultra-wideband SAR imaging;
Journal_Title :
Radar, Sonar and Navigation, IEE Proceedings
