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Zheng, Z. (author), Guo, J. (author), Gill, E.K.A. (author)This paper presents an onboard autonomous mission re-planning system for Multi-Satellites System (MSS) to perform onboard re-planing in disruptive situations. The proposed re-planning system can deal with different potential emergency situations. This paper uses Multi-Objective Hybrid Dynamic Mutation Genetic Algorithm (MO-HDM GA) combined...journal article 2018
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de Athayde Costa e Silva, M. (author), Cordeiro Guerrieri, D. (author), Cervone, A. (author), Gill, E.K.A. (author)CubeSats have been extensively used in the past decade as scientific tools, technology demonstrators and for education. Recently, PocketQubes have emerged as an interesting and even smaller alternative to CubeSats. However, both satellite types often lack some key capabilities, such as micropropulsion, in order to further extend the range of...review 2018
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Bouwmeester, J. (author), Radu, S. (author), Uludag, M.S. (author), Chronas Foteinakis, N. (author), Speretta, S. (author), Menicucci, A. (author), Gill, E.K.A. (author)PocketQubes are a new form factor of highly miniaturized satellites with a body of one or more cubic units of 5 cm. The characteristics of PocketQubes in terms or legal and regulatory aspects, the technological readiness levels and financial considerations are assessed. In particular, an analysis of orbital decay characteristics has been carried...conference paper 2018
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de Athayde Costa e Silva, M. (author), Cordeiro Guerrieri, D. (author), Cervone, A. (author), Gill, E.K.A. (author)Vaporizing Liquid Microthrusters (VLM) have recently received attention as promising propulsion technology for highly miniaturized spacecraft due to its high thrust levels and low power consumption. This paper presents the results of numerical optimization of the parameters for the design of the heating chamber of VLMs that use water as the...conference paper 2018
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Cordeiro Guerrieri, D. (author), de Athayde Costa e Silva, M. (author), Cervone, A. (author), Gill, E.K.A. (author)A Low-Pressure Micro-Resistojet (LPM) is under development at TU Delft with the intention to provide future nano- and pico-satellites with the necessary capability to execute formation flying maneuvers, orbit change maneuvers, and station keeping. In this particular type of electro-thermal thruster, water is a green propellant of excellent...conference paper 2018
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Bouwmeester, J. (author), van der Linden, S. P. (author), Povalac, A. (author), Gill, E.K.A. (author)Developers experience issues with the compatibility, connector size and robustness of electrical interface standards for CubeSats and PocketQubes. There is a need for a lean and robust electrical interface standard for these classes of satellites. The proposed interface standard comprises a linear data bus which is used for housekeeping data,...journal article 2018
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Radu, S. (author), Uludag, M.S. (author), Speretta, S. (author), Bouwmeester, J. (author), Gill, E.K.A. (author), Chronas Foteinakis, N. (author)Delft University of Technology has embarked on PocketQubes to showcase as the next class of miniaturized satellites. In the past decade, CubeSats have grown towards a successful business with mature capabilities. PocketQubes, however, are still in their infancy. The small size of the PocketQubes will trigger innovations in miniaturization and...conference paper 2018
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Bouwmeester, J. (author), Gill, E.K.A. (author), Speretta, S. (author), Uludag, M.S. (author)The dominant architectural approach in CubeSats and PocketQubes is the use of modular physical units, each hosting (part of the) components of classical (virtual) subsystems. Many of these small satellites, however, also host subsystems or experiments with slightly alternative approach, e.g. with cellularization of components or the integration...journal article 2018
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- Shan, M. (author), Guo, J. (author), Gill, E.K.A. (author) journal article 2018
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Zhu, L. (author), Guo, J. (author), Gill, E.K.A. (author)In recent years, the increasing need in small satellite solutions triggers the miniaturization of attitude control systems. Reaction spheres were proposed as promising replacements of conventional reaction wheels for their 4π rotations. Since the generated control torques could be about any desired axes, a single reaction sphere is sufficient...journal article 2018
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Chaves Jimenez, A. (author), Guo, J. (author), Gill, E.K.A. (author)In this work the extent to which orbit and attitude sensors may cross-support each other in a joint processing to reduce estimation errors of the relative orbital and attitude dynamics is investigated. In order to do this, an engineering dynamic model taking into account the coupling effects between orbit and attitude dynamics is exploited...journal article 2018
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Fonod, R. (author), Gill, E.K.A. (author)The problem of pure magnetic detumbling of a fast-tumbling picosatellite is considered. A new weighted B-dot control algorithm is proposed. The algorithm enables power reduction while not sacrificing detumbling performance. Analytical expressions relating the maximal expected rotational rate to the minimum sampling time required are presented....conference paper 2018
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Cordeiro Guerrieri, D. (author), de Athayde Costa e Silva, M. (author), Cervone, A. (author), Gill, E.K.A. (author)There is a clear trend towards the developments of micro-propulsion system to enhance the capabilities of nano- and pico-satellites. A promising propulsion option to meet the strict requirements of these small satellites is the Low-Pressure Micro-Resistojet (LPM) which works under rarefied gas dynamic regime. To simplify the engineering...journal article 2018
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Cordeiro Guerrieri, D. (author), de Athayde Costa e Silva, M. (author), van Zeijl, H.W. (author), Cervone, A. (author), Gill, E.K.A. (author)Three low pressure micro-resistojets (LPM) with integrated heater and temperature measurement were designed, manufactured and characterized at Delft university of technology. The devices were manufactured using silicon-based micro electro mechanical systems (MEMS) technology including a heater made of molybdenum for better operations at high...journal article 2017
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de Athayde Costa e Silva, M. (author), Cordeiro Guerrieri, D. (author), van Zeijl, H.W. (author), Cervone, A. (author), Gill, E.K.A. (author)This paper presents the results of design, manufacturing and characterization of Vaporizing Liquid Microthrusters (VLM) with integrated molybdenum heaters and temperature sensing. The thrusters use water as the propellant and are designed for use in CubeSats and PocketQubes. The devices are manufactured using silicon based MEMS (Micro Electro...journal article 2017
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Uludag, M.S. (author), Speretta, S. (author), Gill, E.K.A. (author), Bouwmeester, J. (author), Pérez Soriano, T. (author)Due to strict constraint regarding the volume of a PocketQube (50x50x50 mm) it is crucial to reduce the space that is consumed by the satellite bus subsystems. This paper focuses on a new architecture for the electrical subsystem in order to reduce its volume and increase the usage of empty surfaces inside the satellite. This increment in volume...conference paper 2017
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Bouwmeester, J. (author), Gill, E.K.A. (author), Speretta, S. (author), Uludag, M.S. (author)The dominant architectural approach in CubeSats and PocketQubes is the use of modular physical units, each hosting (part of the) components of classical (virtual) subsystems. Many of these small satellites, however, also host<br/>subsystems or experiments with slightly alternative approach, e.g. with cellularization of components or the...conference paper 2017
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Speretta, S. (author), Sundaramoorthy, P.P. (author), Gill, E.K.A. (author)This paper aims at analysing the current capabilities of the NORAD Space Surveillance network, in particular focusing on very small objects in LEO. Spacecraft miniaturization has been pushing the limits and capabilities of small satellites so much that spacecraft as small as 5x5x5 cm have already been launched and even smaller ones are currently...conference paper 2017
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Cordeiro Guerrieri, D. (author), Cervone, A. (author), Gill, E.K.A. (author)Heat transfer and fluid flow through different microchannel geometries in the transitional regime (rarefied flow) are analysed by means of Direct Simulation Monte Carlo simulations. Four types of three-dimensional microchannels, intended to be used as expansion slots in micro-resistojet concepts, are investigated using Nitrogen as working fluid....journal article 2016
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Speretta, S. (author), Pérez Soriano, T. (author), Bouwmeester, J. (author), Carvajal Godínez, J. (author), Menicucci, A. (author), Watts, T.G. (author), Sundaramoorthy, P.P. (author), Guo, J. (author), Gill, E.K.A. (author)<b>In the last two decades, CubeSats have changed the perception of satellite missions aided by standardization and usage of commercial-off-the-shelf components. CubeSats have also proven the feasibility of low cost and short development time space missions. The PocketQube with a form factor of 5x5x5 cm has been...conference paper 2016