针对收发分置雷达发射站和接收站之间频率基准的相位同步问题,理论分析了收发站之间的相位误差对雷达的性能影响,并提出一种基于光纤链路的相位同步技术。该技术提取往返光纤链路中引入的相位误差,并通过移相器对输出频率信号进行相位误差预补偿,实现了发射站和接收站的高精度的相位同步。20 km 往返光纤链路的实验结果表明该技术显著抑制了收发站之间的相位误差和噪声,可以有效减少相位误差带来的目标探测偏差。

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.

TN957