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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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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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- Shan, M. (author), Guo, J. (author), Gill, E.K.A. (author) 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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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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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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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), Langer, M (author), Gill, E.K.A. (author)This paper provides results and conclusions on a survey on the implementation and reliability aspects of CubeSat bus interfaces, with an emphasis on the data bus and power distribution. It provides recommendations for a future CubeSat bus standard. The survey is based on a literature study and a questionnaire representing 60 launched CubeSats...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
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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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Chu, J. (author), Guo, J. (author), Gill, E.K.A. (author)This paper presents closed-form solutions for the problem of long-term satellite relative motion in the presence of J2 perturbations, and introduces a design methodology for long-term passive distance-bounded relative motion. There are two key ingredients of closed-form solutions.One is the model of relative motion; the other is the Hamiltonian...journal article 2015
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Heusdens, R. (author), Engelen, S. (author), Buist, P.J. (author), Noroozi, A. (author), Sundaramoorthy, P.P. (author), Verhoeven, C.J.M. (author), Bentum, M. (author), Gill, E.K.A. (author)Pulsars with their periodic pulses and known positions are ideal beacons for navigation. The challenge, however, is the detection of the very weak pulsar signals that are submerged in noise. Radio based approaches allow the use of advanced techniques and methods for the detection and acquisition of such weak signals. In this paper, an effective...conference paper 2012
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Engelen, S. (author), Gill, E.K.A. (author), Verhoeven, C.J.M. (author)Satellite swarms, consisting of a large number of identical, miniaturized and simple satellites, are claimed to provide an implementation for specific space missions which require high reliability. However, a consistent model of how reliability and availability on mission level is linked to cost- and time-effective design of the individual swarm...conference paper 2012
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Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D.C. (author)Precision formation flying missions require formation acquisition and maintenance through the interactions among spacecraft by the inter-satellite communication and relative navigation. This paper analyses the dedicated system constraints of the network architecture for precision formation flying missions. The critical time issue and the...journal article 2012
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- Gill, E.K.A. (author), Gaydadjiev, G.N. (author), Amini, R. (author) patent 2012
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- Maessen, D.C. (author), Gill, E.K.A. (author) journal article 2012
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Van Reijen, B. (author), Koch, N. (author), Lazurenko, A. (author), Weis, S. (author), Schirra, M. (author), Genovese, A. (author), Haderspeck, J. (author), Gill, E.K.A. (author)The Thales diagnostic equipment for ion beam characterization consists of a gridded and single orifice retarding potential analyzer (RPA) and an energy selective mass spectrometer (ESMS). During the development phase of these sensors considerable effort was put into the removal of ion optical effects as well as to ensure equal ion transmission...conference paper 2011
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Sun, R. (author), Guo, J. (author), Gill, E.K.A. (author), Maessen, D. (author)Precise formation flying (PFF) missions require formation acquisition and maintenance through interactions among spacecraft by inter-satellite communication and relative navigation. That requires the network architecture to satisfy dedicated system constraints of time-criticality for updating navigation measurements and flexibility for...conference paper 2011
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Gill, E.K.A. (author), Sundaramoorthy, P. (author), Bouwmeester, J. (author), Zandbergen, B. (author), Reinhard, R. (author)QB50 is a mission establishing an international network of 50 nano-satellites for multi-point, in-situ measurements in the lower thermosphere and re-entry research. As part of the QB50 mission, the Delft University of Technology intends to contribute two nano-satellites both being equipped with a highly miniaturized propulsion system in addition...conference paper 2010