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数据通信系统是整个大型望远镜的数据传输中枢。针对地基大型望远镜分系统多,信号种类繁杂、分布不均匀和分布距离较远等特点,设计了一种基于大规模集成电路FPGA的数据通信系统。系统分为机上数据通信系统和机下数据通信系统两部分,机上与机下数据通信系统通过单根光纤进行连接。系统最多可提供60路RS422、32路TTL、10路RS485和4路RS232同步传输。同时,系统以GPS时钟频率为基准频率产生多种工作时序,为望远镜提供同步工作脉冲;通过采集曝光脉冲对应时刻的时间数据和编码器数据锁存当前的时空信息。硬件方面采用XILINX公司的Virtex-5系列FPGA为核心处理芯片完成该系统的设计,实验结果表明系统可满足大型望远镜数据通信的需求。
Data communication system is the data transmission center of the large telescope. Aimed at the large number of subsystems in the ground-based telescope, the complicated signal types, the uneven distribution and the long distance distribution, a data communication system based on large scale integrated circuit (FPGA) was designed. The system is divided into two parts, the on-board data communication system and the under-machine data communication system. The on-board and under-machine data communication systems are connected through a single optical fiber. The system can provide up to 60 RS422, 32 TTL, 10 RS485 and 4 RS232 synchronous transmission. At the same time, the system generates a variety of working timings based on the GPS clock frequency as a reference frequency and provides a synchronization working pulse for the telescope. The current spatio-temporal information is latched by collecting the time data corresponding to the exposure pulse and the encoder data. Hardware aspects of the Xilinx Virtex-5 series FPGA core processor chip to complete the design of the system, the experimental results show that the system can meet the needs of large telescope data communications.