相位同步技术是多基站星载合成孔径雷达(SAR)系统的关键技术之一。由于主辅星收发分置,两星频率源不同的特点,使得解调的信号存在相位偏差和相位噪声,因而需要在两星SAR系统之间建立相位链路,生成参考相位用以补偿辅星信号,使两星间雷达实现相位同步。但同步链路会引入额外的相位误差,文中基于双向对传的相位同步链路方案,对比分析C、L和X频段的同步链路引入的相位误差。仿真结果为多基站星载SAR 系统设计提供理论依据。

A phase synchronization is one of the key technologies for the multi static spaceborne SAR. Phase noise and phase off-sets exist in demodulation signals because of bistatic different frequency headstream. Auxiliary SAR phase compensation needs to be established with a reference synchronization phase generated by a link between satellites. But a synchronization link introduces phase errors. Based on a duplex mutual transmission scheme, these phase errors are analyzed by comparison from a link of different frequencies(C、L and X). The simulation results provide the design foundation for the phase synchronization of the multi-static spaceborne SAR system.