An Impulse Response Function for Evaluation of UWB SAR Imaging

作者：Vu Viet T^*; Sjogren Thomas K; Pettersson Mats I; Hellsten Hans

来源：IEEE Transactions on Signal Processing, 2010, 58(7): 3927-3932.

DOI：10.1109/TSP.2010.2047503

• Impulse response function in SAR imaging (IRF-SAR)
• impulse response function in UWB SAR imaging (IRF-USAR)
• synthetic aperture radar (SAR)
• Sinc
• ultrawideband-ultrawidebeam (UWB)

Based on analysis of a point target imaged by different synthetic aperture radar (SAR) systems, the commonly used impulse response function in SAR Imaging (IRF-SAR)-a two-dimensional (2-D) sinc function-is shown to be inappropriate for ultrawideband-ultrawidebeam (UWB) SAR systems utilizing a large fractional signal bandwidth and a wide antenna beamwidth. As a consequence, the applications of the 2-D sinc function such as image quality measurements and spatial resolution estimations are limited to narrowband-narrowbeam (NB) SAR systems exploiting a small fractional signal bandwidth and a narrow antenna beamwidth. In this paper, a more general IRF-SAR, which aims at UWB SAR systems, is derived with an assumption of flat two-dimensional (2-D) Fourier transform (FT) of a SAR image and called IRF-USAR. However, the derived IRF-USAR is also valid for NB SAR systems.

• 出版日期2010-7