一种超远程星-地频率相位同步系统

An ultralong-range satellite-ground frequency and phase synchronization system

为了解决卫星与地面电子设备之间超远程的频率、相位同步问题,给出了一种基于锁相环技术的频率相位同步接收系统.根据锁相接收机的工作原理,对环路带宽与微波链路传输电平等关键参数进行了设计;基于星-地实际链路的实验方法,进行了验证.实验结果表明,系统锁相接收机的环路噪声带宽约为20 Hz,环路带内10 Hz处相位噪声为-116 dBc/Hz.该系统实现了36000km星-地频率基准的实时精确相位同步,具备自适应多普勒频率跟踪能力.

In order to implement frequency and phase synchronization between satellite and ground-based electronic equipment,this paper presents a frequency-phase synchronous receiving system based on phase-locked loop(PLL)technology.Then,according to the working principle of phase-locked receiver,the paper designs the key parameters of loop bandwidth and microwave link transmission level.Finally,the paper is based on the experimental method of satellite-ground actual link to make a verification.The experimental results show that the loop noise bandwidth of the system phase-locked receiver is about 20 Hz,and the phase noise at 10 Hz in the loop band is-116dBc/Hz.The system realizes the real-time accurate phase synchronization of 36000 km satellite-ground frequency reference,and has the adaptive Doppler frequency tracking ability.