4th Workshop on Computer Architectures in Space (CompSpace2020) in conjunction with 33nd ARCS 2020, Aachen, Germany, May 25-28, 2020 Call for Papers Background and Focus The aerospace market has undergone rapid changes within the last 15 years. Due to technological progress in consumer electronics satellite design has evolved from the purely use of customised hardware solutions towards the utilisation of commercial off-the- shelf electronics, potentially leading to higher cost efficiency and an increased system performance. The dawn of the CubeSats and upcoming Mega-Constellations of miniaturised satellites are cur- rently fueling the progress, attracting venture capital in a nev- er seen before ratio. Mega-Constellations of satellites for a di- verse range of applications have become reality with the success- ful funding of OneWeb. While using COTS electronics, such missions require an increased level of dependability in all subsystems to enable their use within critical missions and for such with prolonged lifetime re- quirements. However, miniaturised satellites are plagued by low dependability, and require failure tolerance and reliability-en- hancing measures to be implemented. Furthermore, on board comput- ers of such spacecraft need to consider specific boundary condi- tions, which can differ significantly from those of standard com- puting systems. These comprise environmental factors like launch loads or radiations robustness but also limitations regarding power consumption, mass or costs. After its successful introduction at ARCS2017 in Vienna and the successful second workshop at ARCS2018, we will continue to dis- cuss existing and novel approaches for computer architectures in space, targeting an audience from computer architects to space engineers working on miniaturised as well as traditional larger scale satellites. Synergies to existing terrestrial applications as well as computing architectures of constellations and swarms of satellites are a focus of the workshop, being firmly embedded into the main conference. The ARCS conferences series has over 30 years of tradition reporting leading edge research in computer architecture and operating systems. Topics Contributions on the topic of âHardware and Software Architecture of spaceflight on board computersâ are of particular interest but not limited to: * Dependable spacecraft and payload computer architectures * Computer architectures in spaceflight * Mitigation of radiation induced errors * Computing on SmallSats and CubeSats * Space Mission results and lessons learned * Constellations and Swarms * Modified COTS solutions * Real Time and fault tolerance on COTS solutions * Fault detection and fault mitigation * Parallel and Distributed Computing in space * Fault tolerance techniques and strategies in space * Cloud Computing and Big Data in space application environments. * Validation, Certification, Testing and test results Information for Authors Accepted papers will be published by VDE and IEEExplore. The workshop will focus on research presentations as well as brainstorming sessions. Therefore, two kinds of contributions are welcome: * research papers documenting results of scientific investigations, and * position papers proposing strategies or discussing open problems. Deadlines Submission: March 16, 2020 full papers 6-8 pages (full papers, IEEE Format, PDF) via EasyChair: i https://easy-chair.org/conferences/?conf=compspace2020 Notification: March 31, 2020 Camera-ready: April 13, 2020 (max. 8 pages); Ppaers will appear in ARCS 2020 Workshop Proceedings. Workshop: May 25-26, 2020 CompSpace20 Workshop site: https://compspace.in.tum.de/ Further information about ARCS http://arcs2020.itec.kit.edu/ Organisers: Carsten Trinitis ((Technical University of Munich, CAPS) Sebastian Rueckerl (Technical University of Munich, LRT) Nicolas Appel (Technical University of Munich, LRT)