基于CompactPCI的多路遥测信号模拟源的设计与实现

对CompactPCI总线和其他主要的工业计算机总线进行了分析和比较,研究了基于CompactPCI总线的多路遥测信号模拟源的一些关键技术,并对多路遥测信号模拟源的底层软件接口进行了说明.基于CompactPCI总线平台的某卫星测控系统综合测试环境需要产生大量的传感器仿真信号作为遥测源,如果使用传统的采样保持电路和DA组合方式将难以在一个6U的CompactPCI板卡上实现多达128路的DA输出.围绕Analog Devices公司的8通道10?bits串行控制DA芯片AD5318,通过简单的接口电路直接实现与CompactPCI接口芯片连接,大大缩减了板卡上器件,成功的实现了128路的DA输出.同时,设计还在板卡上实现了一个以16?bits AD为核心的高精度反馈回路,以便对各通道的输出实现动态的监控和调整,保证了DA精度和验证遥测采集系统的性能.

Design and realization of multiplex telemetry signal simulate source based on CompactPCI bus

Performace of compact peripheral component interconnect (CompactPCI )bus and other industrial buses were compared and analyzed, some key technolgies in research and implementation of multiplex telemetry signal simulate source based on CompactPCI bus were introduced, the software interface of simulate source were also described. The general testing environment of the satellite test control system, which based on CompactPCI bus, need generate a large amount of simulation signals from sensors as the source of remote sensing. So it is difficult to achieve 128 ways DA output on single 6U CompactPCI board, if still using traditional sampling circuit and the DA integrated mode. Based on the 8-channel 10 bits serial bus controlled DA chip AD5318 produced by analog devices company, it realizes the direct communication between CompactPCI interface chip through simple interface circuits, greatly reducing the amounts of devices on the board and finishing 128-routed output. At the same time, this design also implements a 16 bits AD cored high accuracy feedback loop on the board, dynamically monitoring and regulating each output channel, guaranteeing the DA precision and validating the performance of telemetering collection system.