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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An Evaluation of Ethernet as Data Transport System in Avionics

Doverfelt, Rickard January 2020 (has links)
ÅF Digital Solutions AB are looking to replace their current legacy system for audio transmissions within aircrafts with a new system based on Ethernet. They also want the system to be as closely matching the current Audio Integration System as possible as well as preferably using commercial off the shelf components. The issue evaluated in this thesis is whether it is feasible to port the legacy protocol over to an Ethernet based solution with as few modifications as possible, what performance requirements are present on the Ethernet solution as well as what remaining capacity is available in the network. Furthermore is ÅF Digital Solutions AB interested in what avionics related Ethernet based protocols and standards are already present on the market.The work is conducted in two tracks - one track of experimental measurements and statistical analysis of the latency present in the proposed solutions and one track with a survey regarding the integration of the present Audio Integration System protocol into the propesed Ethernet based solutions. The study finds two standards present on the market: Avionics Full-Duplex Ethernet (AFDX) and Time-Triggered Ethernet (TTEthernet). Two prototype implementations are built, one implementing AFDX and one custom built upon Ethernet and UDP. The latency of these are measured and found to be largely similar at ideal conditions. Ethernet is found to be more flexible, whilst AFDX allow for interoperation with other manufacturers and TTEthernet facilitates strict timing requirements at the cost of specialised hardware. The bandwidth utilisation of AFDX at ideal conditions is found to be 0.980% per stream and for the Ethernet solution 0.979% per stream.It is proposed that ÅF Digital Solutions AB pursue a custom Ethernet based solution unless they require interoperability on the same network with other manufacturers as a custom solution with full control over the network allows the largest flexibility in regards to timings and load. If interoperability is required is AFDX proposed instead as it is a standardised protocol and without the, for ÅF Digital Solutions AB, unnecessary overhead of TTEthernet. / Åf Digital Solutions AB vill undersöka möjligheterna att byta sitt nuvarande legacysystem för kommunikation inom flygplan till ett Ethernet-baserat system. Detta på ett sätt som håller implementationen så nära deras nuvarande Audio Integration System som möjligt. Problemet som undersöks är huruvida det är rimligt att flytta legacyprotokollet till Ethernet med så lite modifikationer som möjligt. Utöver detta vill ÅF Digital Solutions AB veta prestandakraven som blir på en Ethernet-lösning samt hur mycket resterande kapacitet som eventuellt finns kvar för framtida användning. Vidare vill de veta vilka standarder som redan finns på marknaden.Arbetet genomförs genom två spår - ett med experimentella mätningar och statistisk analys och en med ett case-study av integrationen av Audio Integration System och Ethernet. Undersökningen finner två standarder på marknaden relaterat till avionik; Avionics Full-Duplex Ethernet (AFDX) samt Time-Triggered Ethernet (TTEthernet).Två prototyper byggs, en baserad på AFDX och en baserad på UDP och Ethernet. Latencyn för dessa två mäts och finns vara snarlika vid deras respektive ideala scenarion. Ethernet finns vara mer flexibelt, AFDX merinteroperabel och TTEthernet mer lämplig vid strikta tidskrav. Bandbreddsutnyttjandet för AFDX finns vara 0.980% vid ideala förhållanden och 0.979% för Ethernetvid ideala förhållanden.Det rekommenderas att ÅF Digital Solutions använder sig av en egenutformad Ethernetbaserad lösning om de inte har krav på interoperabilitet ty det ger mer flexibilietet gällande tidskrav, protokoll och dataflödet.

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