Title :
A novel SAR imaging processing method based on fractional fourier transform
Author :
Qianrong Lu;Kaizhi Wang;XingZhao Liu
Author_Institution :
Department of Electronic Engineering, Shanghai Jiao Tong University
fDate :
7/1/2015 12:00:00 AM
Abstract :
The fractional Fourier transform (FRFT) is a potent tool to analyze the chirp signal. Here a novel SAR imaging technique based on FRFT is studied. We apply FRFT to range compressed data instead of executing RCMC and Azimuth compression. By FRFT, we estimate (1) Doppler rate, (2) amplitude (3) azimuth beam center crossing time which means azimuth location of a point target in image in accurate way. The relative range locations of point targets can be also determined by the formulation of Doppler rate. Then SAR image can be reconstructed together with estimated amplitudes. The relationship between FRFT order and SAR resolution is also studied. Furthermore, we simulate this method from a multi-points view.
Keywords :
"Synthetic aperture radar","Azimuth","Fourier transforms","Radar polarimetry","Chirp","Signal processing algorithms","Doppler effect"
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International
Electronic_ISBN :
2153-7003
DOI :
10.1109/IGARSS.2015.7326820