Development of Electronics for Space Debris Detector SOLID
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Knowledge of small-particle distributions in space environment models, such as MASTER2009, is limited, due to difficulty in detecting these particles. To verify and improve data for Micro- Meteoroids and Orbital Debris (MMOD) models, Deutches Zentrum für Luft- und Raumfahrt (DLR) is developing the Solar Generator Based In-Orbit Space Debris Detector (SOLID) in-situ space debris detector which is expected to fly as payload in 2014 on the TechnoSat satellite built by Technisches Universität Berlin. This work focuses on the analysis and development of the embedded electronics for SOLID.The expected space environment conditions, encountered during the mission, are analysed using radiation models (SHIELDOSE-2 and AP-8), MMOD model (MASTER2009) and potential EMC issues are investigated according to ECSS standards. The functional and technical requirements, for the space debris detector payload, are also established.A previous SOLID prototype suffered from noise susceptibility. An active filter circuit is therefore designed to attenuate noise from the satellite Switch-Mode Power Supply (SMPS). A Short-Circuit-protection circuit is designed, to avoid excessive fault-currents and resulting performance loss in the satellite Electrical Power Subsystem (EPS). A new Multiplexer-circuit is developed, using a part with smaller PCB-footprint. All circuits are simulated with PSPICE, implemented as prototypes and their functionality successfully verified in lab tests, which also showed very good agreement with theoretical models.A new C-program, for the SOLID Microcontroller Unit, is written, to control the detector circuits, improve software stability, and in the future, to handle the TechnoSat CAN-bus interface. No instabilities were observed in the new software. The implemented embedded electronics also met the strict power requirements.For future work, it is recommended to begin qualification testing on component level, to improve the knowledge of the noise environment from the satellite EPS and to specify, in more detail, the system configuration including circuit board locations, mechanical-, electrical- and softwareinterfaces.
Place, publisher, year, edition, pages
2013. , 172 p.
IdentifiersURN: urn:nbn:se:ltu:diva-44613Local ID: 262bd91f-3dd6-4574-b80c-f3a393d10e76OAI: oai:DiVA.org:ltu-44613DiVA: diva2:1017892
Subject / course
Student thesis, at least 30 credits
Space Engineering, master's level
Validerat; 20130924 (cani)2016-10-042016-10-04Bibliographically approved