一种双模通讯的外系统等效器设计

Design of external system equivalent device based on dual-mode communication

为了克服航天飞行器进行地面模拟测试时,外系统等效器通讯容易中断的问题,设计了一种基于PCI和USB通信技术的外系统等效器。系统以FPGA为中央控制核心,围绕FT245RL和PCI9054芯片进行电路设计,完成对上位机的信息传输,实现了10路RS 485信号和PCM信号的输出。经长期测试,信号输出稳定,满足任务要求,已成功应用于某航天测量系统中。

To overcome the problem of poor communication stability between the external system equivalent devices while the aerospace craft performing the ground simulation tests,an external system equivalent device based on PCI and USB communication technology was designed. This system takes FPGA as the central control unit,and its circuit design is based on chips FT245 RL and PCI9054 to accomplish the information transformation to the upper computer. The outputs of PCM signal and 10 RS 485 signals were realized. Long-term test results show that the signal output is stable,and can satisfy the task requirements.This system was applied to a certain aerospace measurement system.