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Time-Triggered Data Transfers over SpaceWire for Distributed Systems

Borchers, Kai and Lüdtke, Daniel and Fey, Görschwin and Montenegro, Sergio (2018) Time-Triggered Data Transfers over SpaceWire for Distributed Systems. In: IEEE Aerospace Conference Proceedings. IEEE Aerospace Conference, 03. - 10. Mär, Big Sky, United States of America.

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Abstract

SpaceWire as a communication technology for serial data transfer is widely used in the space domain. Although the related ECSS standard describes how data routing in SpaceWire networks shall be implemented, the possibilities of applying real-time traffic are quite limited. As soon as more complex networks with cascades of routers are required, the proposed prioritization given by the ECSS standard is not suitable.This paper introduces a way to remove this limitation. We will present a system capable if establishing a time-triggered data transfer over SpaceWire. This is done by exploiting distributed interrupts which are part of the currently revised ECSS-EST-50-12C standard. These interrupts will serve as a pulse which is used to mark a specific point in time and a related schedule position as valid inside the whole network. This is a different approach than using SpaceWire time codes directly. Our approach allows us to establish a decentralized time distribution instead of relying on a single time providing unit used in existing SpaceWire enhancements. Additionally it removes the limitation of being limited to schedule lengths of 64 slots.

Item URL in elib:https://elib.dlr.de/120504/
Document Type:Conference or Workshop Item (Speech)
Title:Time-Triggered Data Transfers over SpaceWire for Distributed Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Borchers, Kaikai.borchers (at) dlr.deUNSPECIFIED
Lüdtke, DanielDaniel.Luedtke (at) dlr.dehttps://orcid.org/0000-0002-6758-1562
Fey, Görschwingoerschwin.fey (at) tuhh.deUNSPECIFIED
Montenegro, Sergiosergio.montenegro (at) uni-wuerzburg.deUNSPECIFIED
Date:2018
Journal or Publication Title:IEEE Aerospace Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:SpaceWire, Communication, Time-Triggered
Event Title:IEEE Aerospace Conference
Event Location:Big Sky, United States of America
Event Type:international Conference
Event Dates:03. - 10. Mär
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Scosa Onboard Computing
Location: Braunschweig , Bremen
Institutes and Institutions:Institute of Space Systems > Avionics Systems
Institut of Simulation and Software Technology > Software for Space Systems and Interactive Visualisation
Deposited By: Stohlmann, Kai
Deposited On:19 Jun 2018 10:14
Last Modified:19 Jun 2018 10:14

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