EtherCAT在编队卫星动力学仿真测试中的应用研究

Satellite formation dynamics simulation test system based on EtherCAT

针对编队卫星在轨的精确队形控制需求,以及卫星研制中地面动力学仿真测试需结合编队飞行的特点,提出一种基于EtherCAT总线的编队卫星动力学分布式仿真测试系统。该仿真系统在传统单星动力学仿真计算的基础上,通过EtherCAT网络实现了分布式仿真系统构建,充分利用EtherCAT网络实时性高、拓扑结构灵活、可扩展的特点,实现编队卫星在轨星间数据、队形拓扑、动力学特性实时仿真,并具备综合调度和数据管理功能。通过构建EtherCAT分布式仿真测试系统,设计综合调度软件,对分布式仿真测试系统的实时性进行了验证。经验证分布式仿真系统能够实现优于1 ms的系统实时性,可以满足编队卫星动力学仿真测试的要求。

Generally, formation flying should be taken into consideration during satellite development. Aiming at the demand of precise formation control, a distributed dynamics simulation and test system for formation flying satellites based on EtherCAT is proposed in this article, compared with traditional single satellite dynamics simulation systems. Taking the advantages of EtherCAT’s real-time character, flexible topology and extensibility, the system is capable of integrated dispatching and data management, including the real-time simulation function of satellite data, formation topology and dynamic characteristics. In this paper, the validity has been demonstrated by constructing the EtherCAT based distributed system and designing the integrated dispatching software. Finally, the real-time performance of the proposed system has been tested and verified better than 1 ms, which meets the requirement of satellite formation dynamics simulation and test.