Rural e-mail system for the Sumbandila satellite

[摘要] ENGLISH ABSTRACT: Keywords: digital signal processing, OSI layer, network protocols, embedded systems,satellite technologyThis thesis describes the design and implementation of a rural e-mail system for the Sumbandilasatellite. The rural e-mail system was developed during a project sponsored bythe Department of Communications of the South African government. The complete OpenSystems Interconnect (OSI) layer structure of the protocol architecture used on the satellitehardware and software is described. The equivalent implementation of the OSI layer on theground station hardware is given. This includes the adaptation of the soundmodem OpenSource Software modem to work for the e-mail system's OSI layer. The design of the ApplicationLayer e-mail system is described and the implementation of this design using thePython, Korn Shell and C programming environments is also given. The procedures used totest the system for reliability and the use of a database to create detailed logs of the e-mailsystem is shown to have generated a reliable system that is easily maintained. A criticalevaluation of the system is provided in the last chapter.

[发布机构] Stellenbosch University