小卫星模拟系统中多路串行通信系统设计

Design of multi-serial communication for micro-satellite simulation system

针对小卫星模拟系统中星载计算机与相机载荷通信及控制问题,研发多路串行通信控制系统。系统设计采用Host-Target模式,在星载计算机(Host)端软件实现多路通信管理子系统,设计基于现场可编程门阵列(FPGA)的相机载荷分控单元(Target);同时,在RS-232通信协议基础上提出一种多路串行通信协议,完成星载计算机与相机载荷分控单元的通信控制。用SignalTapⅡ逻辑分析工具捕捉FPGA内部实时信号对系统性能进行验证,结果表明该系统可对单一或者多路相机载荷进行灵活控制与管理。

A communication system with several serial ports was developed to realize the communication between On- Board Computer （OBC） and cameras in micro-satellite simulation system. The system was designed in Host-Target model. The Host sever managed the multiplex communications between the host and its clients. It also sent out trigger signal to control five cameras through a Field Programmable Gate Array （FPGA） chipset. In addition, a muhiplex serial communication protocol based on RS-232 protocol was proposed to complete the communication. The logic analytical tool SignalTap 1/ was used to capture the real-time signal of FPGA to verify the performance of the system. The results indicate that the system can control and manage a single camera or multiple cameras flexibly.