Research on technologies of self — Routing for multipath in distributed test system

The distributed test system is a new type of data acquisition and control system which is based on the mutual development of multiple technology such as computer technology, embedded technology, signal processing technology and network communication technology. As a key technology of distributed test system, routing technology is used to realize the basic function of interconnection and intercommunication among multiple test nodes and between multiple test nodes and data processing center as well as the centralized control function of data processing center. Based on the study of characteristics of multi-point distributed data acquisition and transmission test system and advantages and disadvantages of various network topologies, we have put forward a distributed test system based on optical fiber transmission as well as routing algorithm and test node data link backup mechanism based on fast perceptual of neighbor nodes. The test system can adapt to the complex test environment, and the routing technique has the function of data routing addressing between different test nodes. It can quickly perceive the network communication state of the neighbor nodes and select the best communication path according to the communication state so as so realize the data transfer between test nodes and data processing centers as well as data exchange between different test nodes. The test node backup mechanism mainly aims at two kinds of network problems: test node failure and link failure, and effectively improves the robustness of network communication. We have verified the routing algorithm with the simulation experiment of Modelsim. Results has shown that the algorithm is simple and fault-tolerant and the best communication path can be chosen to realize the communication between the test node and the data processing center according to the network communication of the neighbor nodes.