The Design And Implementation Of XXXX Satellite Real-Time Transmission Subsystem

The XXXX satellite ground communication system is responsible for the transmission of original satellite data, the measurement and control data and the dispatch command. This system plays a vital role in the XXXX satellite career of our nation.As a part of the system, the communication subsystem aims at making real-time, efficient, secure and stable transmission of original satellite data between different sites. The communication subsystem is divided into two parts:the real-time transmission subsystem (XXXX01), which provides efficient and reliable transmission functionality from relay to receiver site; the communication equipment surveillance subsystem (XXXX02), which enables remote surveillance and notification message for modem, router, communication transceiver equipment. The real-time transmission subsystem is running on UNIX communication server installed in relay and receiver site, and the communication equipment surveillance subsystem takes Windows PC as its running environment. The real-time transmission subsystem can provide efficient data transmission for the whole communication subsystem.Based on the analysis and research to the basic theory and method of communication models, according to the actual requirements of the real-time transmission subsystem, we bring forward and establish the communication model of the real-time transmission subsystem, give general structure design of the system, and based on the communication model, we explain the function design of the transmitter and receiver and the design of communication interfaces and communication protocols which include module devision, inner interface of module level interaction, implementation of the module function, outer interface of system level interaction and so on. According to above system design, we implement the real-time transmission subsystem under UNIX platform.According to the actual application requirements, we implement a systematical test to the real-time transmission subsystem whose result shows that the subsystem has fulfilled both functionality requirements and performance requirements required by the whole satellite communication system.Finally, we give some advice on the optimization of the real-time transmission subsystem.