在卫星中使用以太网的目的是为了在获得灵活的通信接入的同时得到高速的通信速率,并且能满足安全关键场合通信对实时性和确定性的要求.针对国内在空间应用上还未大规模使用以太网这一现实,着眼于解决以太网应用到航天器内部所碰到的实时性、确定性的瓶颈问题,本文对一种有潜力应用到卫星内部的实时以太网(Powerlink)进行研究.在FPGA内部实现Mircoblaze嵌入式系统,外接以太网PHY芯片实现协议栈物理层功能,二者结合为Powerlink协议栈提供运行环境.通过实验验证了设计的可靠性和正确性,可为Poweflink在航天领域的研究与应用提供借鉴.%The main purpose to use Ethernet in satellite is to take advantage of its flexibility to meet the requirement of communication access,simultaneously take into account that Ethernet has high data rates,and expect that it has both real-time and deterministic in safety field.Focus on the situation in China that the Ethernet has not been large-scale used in space,tend to solve the problem of real-time or deterministic encountered inside the spacecraft.A real-time Ethernet (Powerlink)that has the potential to be used in the satellite is studied in this paper.Mircoblaze embedded system is implemented in FPGA and Ethernet chip is externally plugged to realize the physical layer functions of protocol stack,the combination provided the processing environment for Powerlink protocol stack.The reliability and accuracy of the design is proved through experiments and the results of the paper can provide a guideline for Powerlink research in the field of space application.
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