Abstract: The spatial separation of bistatic radar results in a special requirement of phase synchronization between the transmitter and receiver. In this paper, the impact of phase error on ground-based bistatic radar is theoretically analyzed with a general mathematical phase error model, and a phase synchronization technique via 20 km round-trip fibre optic link is proposed. With the proposed technique, the phase error is effectively reduced. A typical wideband linearly frequency modulated radar system was used in the analysis and whole simulations. The simulation results show that the radar image is sensitive to the phase noise, and this FOL synchronization technique is effective for keeping the image from deterioration.