Design And Implementation Of Aerospace Relayed Network-links Emulation

In recent years, aerospace relay network with its tracking and relay features gradually been widespread concern. Since the link characteristics of aerospace relay network environment different from the existing network system, only conduct research, analysis and simulation of air and space suitable relay network link characteristics, in order to ensure test and perfect a particular network protocol. Air and space-based relay network link simulation will facilitate the study of advanced network protocols development, more conducive to promoting the rapid development of network technology. This article is a reference to Chinese relay network model to obtain a particular scene simulation parameters link, to delay algorithm designed to highlight the link characteristics for the long delay, and delay module realized according to different delay algorithms, test and comparisons.Aerospace research relay network link emulation mainly contains the following three parts: scene simulation, delay algorithm design and delay module implementation. Scene simulation mainly to meet the network protocol testing, concurrent access to transport, demand heterogeneous smooth handover reference existing aerospace relay network model simulation analysis of each of the three scenarios, in order to obtain the corresponding scene of chain Road link parameters for analog networks. Prominent among these is the long delay link characteristics, hence the need for analysis and design and implement algorithms delay control. Delay algorithm is designed primarily to convert the link delay queuing delay is controlled by analyzing the errors on the link from the changes brought about by the delay, targeted designed three delay control algorithms. To implement delay module according to the proposed delay algorithm. After the delay control to achieve, changed the desired delay value, interruption frequency and CPU load and other aspects of the test delay control, analyze and compare the advantages and disadvantages delay algorithm, and then select the appropriate delay control parameters more in line with the needs of the delay control system implementation methods.This article put the design delay module and the Linux kernel Netem module in the network simulation software engineering methods were used to achieve, for the use of air and space network access demonstration system, through presentations and practical feedback system, two test methods are available and effective.