导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2005, Vol. 26 ›› Issue (6): 748-753.

• 论文 • Previous Articles     Next Articles

Symmetry FrFT Used to Suppress the Fixed Background Clutter to Detect Moving Target in a SAR Image

CHEN Guang-dong, ZHU Zhao-da, ZHU Dai-yin   

  1. College of Information and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2004-12-06 Revised:2005-08-04 Online:2005-12-25 Published:2005-12-25

Abstract: In single channel SAR, the echo from a slow moving target is confused with ground clutter in time、space and frequency domains. If the information about fixed clutter in SAR image can be used to suppress the background clutter, the detection of moving target will be easy. The fractional Fourier transform is a linear operator, and will not be influenced by cross terms. The FrFT is a way to concentrate the energy of the echo from a ground moving target. In two symmetry fractional Fourier domains with two inverse rotation angles of every SAR image tangential line, the static clutter’s spectrums are same, while the moving target’s are different. The absolute value subtracting of the two signals can be expected to have superior moving target detection performance. The experiment result proveds the validity of this method.

Key words: synthetic aperture radar, moving target detection, fractional Fourier transform

CLC Number: