Abstract:

A new approach to ground moving target detection based on two-look processing is proposed for the single channel SAR system. In the proposed approach, according to the shifts of the Doppler spectra of moving targets relative to that of a stationary scene, the Doppler spectra of echoes are separated into two parts and focused separately to obtain two sub-images; the ground clutter can be suppressed by incoherent subtracting of t1he two sub-images; so the signal-to-clutter-plus-noise ratio(SCNR) can be improved. The procedures for ground moving targets location are as follows: the detected moving target complex signatures are first extracted by a window in the SAR image after clutter suppression, then the ground moving targets can be precisely located through estimating the Doppler spectra shift quantities between the ground moving targets and clutter through which the constant false alarm rate (CFAR) can be decreased simultaneously. The validity of this method is verified by the simulation data and the measured data.

Key words: synthetic aperture radar(SAR), ground moving target detection(GMTD), target locating, multi-look procession