Title :
ISAR imaging of fast-moving target based on FRFT Range Compression
Author :
Zhiping, Yin ; Zhen, Fu ; Dongjin, Wang ; Weidong, Chen
Author_Institution :
Univ. of Sci. & Technol. of China, Heifei
Abstract :
The echo signal of fast-moving target is established. In conventional reconstruction algorithm, the discrete Fourier transform (DFT) is used to accomplished range compression. However for the fast-moving target, range dispersion will occur in the DFT range compression, deriving from the high-speed radial motion. It will distort the range profile and defocus the ISAR image. A new reconstruction algorithm is proposed, which use Fractional Fourier Transform (FRFT) instead of DFT to implement the range compression. The analysis indicates that the new algorithm can avoid the range dispersion and achieve refocused ISAR image effectively. The simulation results show the good performance of the new algorithm.
Keywords :
discrete Fourier transforms; image coding; image reconstruction; radar imaging; radar tracking; target tracking; DFT range compression; FRFT range compression; ISAR imaging; conventional reconstruction; discrete Fourier transform; echo signal; fast-moving target; fractional Fourier transform; high-speed radial motion; image reconstruction; range dispersion; range profile; Azimuth; Discrete Fourier transforms; Fourier transforms; Frequency; Image coding; Radar imaging; Radar scattering; Reconstruction algorithms; Space vector pulse width modulation; Spaceborne radar;
Conference_Titel :
Synthetic Aperture Radar, 2007. APSAR 2007. 1st Asian and Pacific Conference on
Conference_Location :
Huangshan
Print_ISBN :
978-1-4244-1188-7
Electronic_ISBN :
978-1-4244-1188-7
DOI :
10.1109/APSAR.2007.4418614
