Title :
An advanced equivalent slant range model and image formation in geosynchronous SAR
Author :
Wu, Xiu ; Zhang, Shunsheng ; Xiao, Bo
Author_Institution :
Res. Inst. of Electron. Sci. & Technol., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Synthetic aperture radar on geosynchronous satellite (GEO SAR) has significant potential advantages over conventional low Earth orbit radars, albeit it also has challenges to overcome. In GEO SAR, the imaging geometry is more complicated and the range and azimuth variances are more severe. In order to deal with these problems, this paper presents an advanced equivalent slant range (AESR) model for the synthetic aperture radar undergoing an inclined circular orbit. Furthermore, the range and phase error between AESR model and conventional slant range model are also gauged in detail. Meanwhile, based on the AESR model, the accurate two dimensional (2-D) frequency spectrum (PTFS) expression of point target is obtained. And the modified algorithm and simulation results validate the AESR and show its advantages in image formation in GEO SAR cases.
Keywords :
artificial satellites; synthetic aperture radar; 2D frequency spectrum; AESR model; GEO SAR; PTFS expression; advanced equivalent slant range model; conventional slant range model; geosynchronous SAR; geosynchronous satellite; image formation; imaging geometry; inclined circular orbit; low Earth orbit radars; phase error; range error; synthetic aperture radar; Azimuth; Imaging; Low earth orbit satellites; Mathematical model; Orbits; Spaceborne radar; Synthetic aperture radar; 2-D PTFS; SAR signal processing; Synthetic aperture radar on geosynchronous satellite (GEO SAR); equivalent slant range model;
Conference_Titel :
Microwave and Millimeter Wave Circuits and System Technology (MMWCST), 2012 International Workshop on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4673-1893-8
DOI :
10.1109/MMWCST.2012.6238179
