Evaluating the Impact of Packet Delay and Loss on a Network Control System in DETERlab
Christine P. Chen, Jia Bai, Xiaowei Li, Yuan Xue · 2006
The objective of my project was to analyze how adding time delay and packet loss will alter the second-order input signal after it has travelled from the digital controller across the wired control network system to the plant output. The study was conducted using the state-feedback UDP network control system that was created by using software implementation. The plant and controller programs were written with the use of socket programming in Java, and the programs were compiled and run by remote accessing into two nodes. The nodes were part of the network topologies that were created in experiments in the DETER Network Security Testbed at UC Berkeley. Using data that was collected from the experiments, the magnitude of the plant output was plotted over time, and the graph results that were obtained allowed for comparative analysis between the ideal plant output in an idealized network that had no added packet loss or time delay parameters with the plant output from an imperfect network that had additional network security vulnerabilities. The results from this paper contribute to data that is being collected in understanding how time delay and packet loss will affect a state-feedback signal of UDP packets that has gone through an internet communications network, and it reveals an efficient way for internet network security monitoring.