Andisheh moezzi - Department of Electrical and Computer Engineering, shiraz University, shiraz, Iran
Mohamad Ali Masnadi-Shirazi - Department of Electrical and Computer Engineering , shiraz University, shiraz, Iran

A time series representation is usually the first and most natural description of a signal .However, in order to extract the information present and use it to its full potential, one may analyze the signal using various data representations. Time-frequency analysis is a powerful tool which may be used in signal detection, characterization, and processing. The signal character differences between a moving target and a stationary target can be revealed in the time-frequency domain. Motions of a moving target changes the Doppler centroid and Doppler modulation rate of the moving target, and time-frequency analysis algorithms are highly efficient in extracting the motion parameters. Understanding the Doppler frequency shift induced in SAR signal returns is essential in appreciating the utility of TF analysis for GMTI applications.

synthetic aperture radar (SAR), ground moving target indication (GMTI), ground moving target imaging (GMTIm), time-frequency representation