嫦娥五号轨道器1553B总线网络设计

Design of 1553B Bus Network for Chang’e-5 Orbiter

嫦娥五号探测器由多器组成,其中轨道器构型为多舱段结构。各器间及各舱段间的信息网络采用1553B总线,各器之间、各舱段之间通过分离连接器进行电信号的传输,因此1553B总线需设计为穿舱的结构。本文论述了轨道器1553B总线网络的设计方案情况,通过对比两种设计方案,并主要针对经过低频连接器的1553B总线网络上的各个RT终端进行物理层和协议层的性能测试,确定了采用主总线与短截线穿舱相结合的设计方案。同时由于飞行器分离,1553B总线在实际的使用过程中需要进行重组,因此可以通过设置总线开关的方式进行总线重组方案设计,当舱段分离前,将相应的总线开关进行加电,切换到终端匹配电阻的模式,从而形成完整的总线结构。此种设计方案为多舱段飞行器间的总线网络设计提供了可供借鉴的示例。

The Chang’e-5 probe is composed of multiple spacecraft,among with the orbiter is a multi-module structure.The information network between each device and each module adopts 1553B bus,and the electrical signals are transmitted between each device and each module through a separation connector.In this paper,the design schemes of the 1553B bus network for orbiters are discussed.Two design schemes are compared.The performance of the physical layer and the protocol layer for each RT terminal on the 1553B bus network passing the low-frequency connector is tested.Based on the test results,the design scheme combining the main bus with the short-cut line crossing the module is determined.At the same time,owing to the orbiter separation,the 1553B bus needs to be reorganized in the actual use process.Therefore,the bus recombination scheme can be designed by setting the bus relay.Before the separation,the corresponding bus relay is powered up and switched to the mode of terminal matching resistance to form a complete bus structure.This design scheme provides an example for the design of bus network between multi-module orbiters.