Synthetic aperture radar （SAR） imaging can accurately locate the static target， but for moving targets， the geometric position is offset due to the Doppler frequency. This paper， by exploiting this characteristic of SAR imaging for moving targets and combining it with homing measurement and positioning results， derived a moving target discrimination method in principle by comparing the two measurement results. The method provides airborne and missile-borne target recognition systems with short observation time and compact configuration to discriminate whether a target is moving by transmitting only a single LFM waveform and lays the foundation for countering passive deception jamming， such as corner reflectors and chaff. In this paper， the SAR imaging model for radar observation of sea surface targets was established， and the mechanism of SAR imaging was analyzed. Then， the differences in target position measurements between radar homing mode and SAR imaging mode were described， and a method for recognizing moving targets based on these differences was deduced. Simulation results show that the proposed method exhibits good detection performance under the condition of a limited number of image frames.