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Available SAR-Ground Moving Target Indication (SAR-GMTI) method based on the forward-looking antenna is mainly Space-Time Adaptive Processing (STAP), which is hard to be practically realized. For this fact, an advanced SAR-GMTI method based on the forward-looking airborne radar is proposed in this paper. This paper establishes the echo model of moving targets, and illustrates the connection between the traditional Displaced Phase Center Antenna (DPCA) systems and this proposed system. The improved DPCA technology is presented for moving target detection, location and velocity measurement. Finally, the simulation results confirm the effectiveness of the improved DPCA technology.