嫦娥五号探测器多舱段间接力式校时及误差控制方法

A Relay Time Calibration and Error Control Method among Multiple Modules of Chang’e-5 Probe

为优化嫦娥五号探测器操控,达到通过给任意具备测控链路的舱段校时即可实现多舱段组合体时间同步的目标,提出了一种接力式校时及误差控制方法。该方法通过相邻舱段间接力式时间传递实现舱段间时间自流动。设计了基于飞行模式的时间基准设备检索方法,通过统一的检索配置表使各设备能够根据飞行模式识别上级时间基准设备,实现了各舱段的自主校时。设计了总线控制器(Bus controller,BC)与远置单元(Remote terminal,RT)间的分布式时间传递误差控制方法,BC端修正时间信息发送时产生的误差,RT端控制时间信息接收时引入的误差,保证了整器时统精度。研究方法实现了多舱段复杂航天器的器内自组织时统,已在嫦娥五号探测器上得到应用并取得预期效果,可为后续航天器软件设计提供参考。

To optimize the control of Chang’e-5 probe,a relay time calibration and error control method is proposed to achieve the goal of synchronizing the time of multiple modules through any module with physical uplink channel.In this method,the time self-flow among multiple modules is realized by time relay transfer between adjacent modules.A retrieval method of time reference device based on flight mode is proposed.Through the unified retrieval table,each device can identify the superior time reference device according to flight mode,and the autonomous time calibration of each module is realized.A distributed time transfer error control method between the bus controller(BC)and the remote unit(RT)is proposed.The BC terminal corrects the error when the time information is sent,the RT terminals control the error when the time information is received,and the accuracy of the whole system is guaranteed.The self-organizing time synchronization of complex multi-module spacecraft is realized by the proposed method.The effectiveness of this method has been verified by the actual flight of Chang’e-5 mission.It can provide reference for future spacecraft software design.