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Examinando (Espacio) Artículos por Materia "Aerospace engineering"
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Publicación Restringido Early SEU sensitivity assessment for collaborative hardening techniques: A case study of OPTOS processing architecture(Elsevier, 2019-03-06) Portela García, M.; Rodríguez, Santiago; Rivas, J.; López Buedo, S.; Martín-Ortega, Alberto; Martín-Ortega, Alberto; de Mingo Martín, José Ramón; Instituto Nacional de Técnica Aeroespacial (INTA); Universidad Carlos III de Madrid (UC3M); Universidad Autónoma de Madrid (UAM)Nowadays, space missions face a relentless increase in requirements for on-board computers. Higher computing capacities are needed, while the power consumption, mass and area must be reduced. Unfortunately, requirements evolve faster than the ability of manufacturers to develop better space-qualified processors, so techniques that allow designers to use COTS (commercial, off-the-shelf) components are needed. As such, collaborative hardening is a powerful an efficient technique to guarantee the reliability of the safety critical tasks of a satellite. However, the stringent dependability requirements of space missions call for comprehensive on-ground validation of any design using COTS components before it can be used in orbit. In this work, we present the collaborative hardening techniques developed for the OPTOS satellite, and how it was on-ground validated against the effects of radiation. We introduce a methodology for early SEU sensitivity assessment based on fault injection through an autonomous emulation system. Fault injection is performed at system level, not unit level, to validate the safety critical techniques implemented by the collaborative architecture. The experimental results show that, while single units are vulnerable to the effects of radiation, the reliability of the system as a whole is not compromised.Publicación Restringido Mars 2020 Rover Influence on Wind Measurements at Low Reynolds Number(Aerospace Research Central, 2019-02-11) Bardera, Rafael; García Magariño, A.; Urdiales, María del Mar; Sor, Suthyvann; Instituto Nacional de Técnica Aeroespacial (INTA)The Mars 2020 rover is the new vehicle dedicated to the Martian surface investigation. This vehicle will transport Mars Environmental Dynamic Analyzer, the new meteorological station, including two wind sensors installed in the camera mast. An experimental characterization was conducted to investigate the influence of the Mars 2020 rover in the Mars Environmental Dynamic Analyzer wind measurements at low Reynolds numbers. Wind tunnel experiments were conducted using a 1:45th scaled model in a wind tunnel specially designed for these experiments. The velocity was measured using laser Doppler anemometry. A method is proposed in this investigation to calculate a correction factor for the data measurements of wind sensors embarked on rovers dedicated to planetary exploration missions. In particular, the method was applied to wind measurements taken by Mars Environmental Dynamic Analyzer in the Mars 2020 rover using the laser Doppler anemometry measurements, and corrections up to 40% in the velocity magnitude and 23 deg in the deflection angle were found.
