Academic Profiles

Research Interests

Research in Space systems at Surrey is dominated by practical results. Having contributed to the design and launch of 26 spacecraft (2006) SSC has a strong practical perspective in space research. Vaios’s research is mainly focused on 3 areas: (i) attitude control and determination (ii) advanced concepts and (iii) propulsion.

Control Moment Gyroscopes (CMGs)

Vaios has developed these small yet powerful actuators for the next generation of agile spacecraft. CMGs are usually complex and expensive and have flown on space stations and military spacecraft. Developments in microelectronics and mechatronics has enabled a new approach towards the design of smaller, affordable and low cost CMGs. Vaios demonstrated the viability of CMGs for small satellites and designed the first commercial small satellite CMGs currently in orbit on the Turkish BILSAT-1 microsatellite. This project was funded by SSTL, ESA and the Turkish Academy of Sciences (TUBITAK). Under funding from ESA Vaios is leading the design of an improved and scalable CMG design for small satellites. Vaios is working closely with Prof. Bong Wie on the development of these CMGs along with various singularity avoidance algorithms.

Solar Sails

Solar Sails have become one the ‘hottest topics’ in the space community and specifically in the systems design and attitude control aspects. Solar Sails come with the promise of propelling spacecraft with unprecedented ΔVs without ‘propellant’. Solar Sails work as protons reflect on a large reflector surface. Vaios has been the PI and study manager for a miniature 5 x 5 m micro sail for a study funded by ESA. Micro Solar Sails come with the promise of low cost propellantless systems that do not have the technology challenges of large solar sails (design, dynamics, control, manufacture) and can be used in formations to study niche science objectives such as monitoring the Earth’s geomagnetic tail. On the other spectrum Vaios participated in an ESA funded studied managed by Kayser Threde and dealt with the conceptual design of a 245 x 245 m solar sail called the Interstellar Heliopause Probe (IHP). Surrey was responsible for the small satellite platform design and the overall spacecraft/sail GNC system. Vaios is also working closely together with Prof. Bong Wie on various systems and ACS concepts for Solar Sails.

Combined Energy Storage and Attitude Control Systems (CEACS)

CEACS comes with the promise of reducing the mass of a spacecraft, which has high power and ACS requirements. Vaios is the PI on a USAF contract which is studying the sizing, design and proof of concept of such technology for small satellites. Further, Vaios with his PhD student David Richie are working on the same research contract for the USAF on studying various control algorithms for a large scale CEACS system developed by the USAF in the Air Force Research Laboratories in Kirkland, NM, USA.

UAV’s

Unmanned Aerial Vehicles have become important tools for reconnaissance and robotic missions. Vaios is researching systems and algorithms for autonomous systems using a 3-m UAV helicopter. The ‘ICARUS’ vehicle will also be used to demonstrate robust algorithms for terminal descent Mars Lander simulations.

Mars Landers and Mars Ascent Vehicles

Vaios has worked on the system design and GNC algorithms for Mars landers and ascent vehicles with MSc and PhD students. This research was funded by the ESA Aurora program.

Spacecraft Simulator

Space engineering despite progress made in low cost design is still and expensive and complex business. A spacecraft simulator based on a 3-axis air bearing is being designed at Surrey. George Prassinos is leading this effort which will include propulsion and CMG modules for agile 3-axis control.

1-m Resolution Small Satellites

Funded by SSTL this research activity explores the technological shortcomings on developing the next generation of 1-m resolution Earth Observation spacecraft. Based on the known concept of the Dobson telescope Surrey is studying the technology for future use. George Prassinos is currently conducting his MPhil on this subject.

Formation Flying/Coulomb and Lorentz Formations

Surrey and Cornell Universities are working together on a research grant by ESA ACT (Ariadna) on formation flying missions using Lorentz and Coulomb charging techniques. Mini Saaj, a research fellow from Surrey is actively working on a hybrid combination of the two techniques under supervision by Vaios and Mason Peck, Assistant Professor, Cornell University.

Propulsion

Propulsion is a key research area at Surrey. Micro-resistojet thrusters have been mastered at Surrey, many of them having flown on UoSAT-12, SNAP and DMC spacecraft. Vaios is supervising two PhD students on electric propulsion: Peter Shaw working on Plasma Pulsed Thrusters and Angelo Grubisic working on micro hollow cathode tubes.

Research Collaborations

Vaios works closely with Prof. Bong Wie (Arizona State University), Mason Peck (Cornell), Prof. Jozef van der Ha (consultant), Prof. N. Uzunoglou (NTUA), Prof. E. Sarris (Democritus-Thrace) and Jerry Fausz (USAF). Internally Vaios works with all academics in SSC and is assisting Dr. Craig Underwood on the Palmsat program.

Teaching

Vaios teaches undergraduate and postgraduate courses in the School of Electronics. These include Spacecraft Dynamics and Control (EE3.dyc), Launch Vehicles and Propulsion (EEM.lvp), Satellite Subsystems (EE3.sbs) and Control Engineering (EE3.ctl). Vaios also supervises undergraduate and postgraduate students in topics such as: attitude control, micro UAVs, Mars Lander dynamics and control, solar sail attitude control.

PhD Students

Vaios is currently supervising 3 PhD students: Peter Shaw on PPTs, Angelo Grubisic on micro-HCT, David Richie on CEACS, Alice Darbyshire on CMGs and he also has worked with Sajjad Ashgar (CMGs) and Stephen Wokes (solar sails) who are supervised by Dr. Palmer and Prof. Mark Roberts.

Awards

  • AIAA Utah Small Satellite Student Competition (3rd Place), 2000
  • IAF Student Competition (1st place) 2001
  • Canadian Space Agency Caroline Babin award (2000)
  • Best paper, co-author with Jozef van der Ha, AAS Astrodynamics Specialist Conference (Lake Tahoe), 2006
  • Scholarships: EUMETSAT, SSTL, EPSRC, Canadian Space Agency, ESA
  • Grants (Royal Society, University of Surrey, Institute for Advanced Studies)

Consulting

  • Vaios consults for the Hellenic Space Systems company.

Contact Me

E-mail:
Phone: 01483 68 3412

Find me on campus
Room: BA U

Publications

Highlights

  • Lappas V, Wie B. (2009) 'Robust Control Moment Gyroscope Steering Logic with Gimbal Angle Constraints'. AMER INST AERONAUT ASTRONAUT JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, Keystone, CO: 32 (5), pp. 1662-1666.
  • Lappas V, Richie D, Hall C, Fausz J, Wilson B. (2009) 'Survey of Technology Developments in Flywheel Attitude Control and Energy Storage Systems'. AMER INST AERONAUT ASTRONAUT JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, 32 (2), pp. 354-365.
  • Lappas V, Mengali G, Quarta AA, Gil-Fernandez J, Schmidt T, Wie B. (2009) 'Practical Systems Design for an Earth-Magnetotail-Monitoring Solar Sail Mission'. AMER INST AERONAUT ASTRONAUT J SPACECRAFT ROCKETS, 46 (2), pp. 381-393.
  • Schaub H, Lappas VJ. (2009) 'Redundant reaction wheel torque distribution yielding instantaneous L 2 power-optimal attitude control'. Journal of Guidance, Control, and Dynamics, 32 (4), pp. 1269-1276.
  • Richie DJ, Lappas VJ, Wie B. (2009) 'Practical steering law for small satellite energy storage and attitude control'. Journal of Guidance, Control, and Dynamics, 32 (6), pp. 1898-1911.
  • Lappas V, Wie B, McInnes C, Tarabini L, Gomes L, Wallace K. (2007) 'Microsolar sails for Earth magnetotail monitoring'. AMER INST AERONAUT ASTRONAUT JOURNAL OF SPACECRAFT AND ROCKETS, 44 (4), pp. 840-848.
  • Lappas V, Prassinos G, Baker A, Magnuss R. (2006) 'Wireless sensor motes for small satellite applications'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE ANTENNAS AND PROPAGATION MAGAZINE, 48 (5), pp. 175-179.
  • Lappas V, Wie B. (2006) 'Robust CMG steering logic with gimbal angle constraints'. Collection of Technical Papers - AIAA/AAS Astrodynamics Specialist Conference, 2006, 2, pp. 1425-1438.

Journal articles

  • Fernandez JM, Visagie L, Schenk M, Stohlman OR, Aglietti GS, Lappas VJ, Erb S. 'Design and development of a gossamer sail system for deorbiting in low earth orbit'. Acta Astronautica, 103, pp. 204-225.
  • Ummen N, Lappas V. (2014) 'Polyhedron tracking and gravity tractor asteroid deflection'. Acta Astronautica, 104 (1), pp. 106-124.
  • Ghiglino, P , Forshaw JL, Lappas VJ. (2014) 'OQTAL - Optimal Quaternion Tracking using Attitude Error Linearization'. IEEE Transactions on Aerospace and Electronic Systems,
    [ Status: Submitted ]
  • Ghiglino P, Forshaw JL, Lappas VJ. (2014) 'Online PID Self-Tuning using an Evolutionary Swarm Algorithm for Unmanned Flight'. AIAA Journal of Guidance, Control, and Dynamics,
    [ Status: Submitted ]
  • Forshaw JL, Lappas VJ, Briggs P. (2014) 'Transitional Control Architecture and Methodology for a Twin Rotor Tailsitter'. AIAA Journal of Guidance, Control, and Dynamics, 37 (4), pp. 1289-1298.
  • Jaffery MH, Shead L, Forshaw JL, Lappas VJ. (2013) 'Experimental quadrotor flight performance using computationally efficient and recursively feasible linear model predictive control'. International Journal of Control,
  • Belo FAW, Birk A, Brunskill C, Kirchner F, Lappas V, Remy CD, Roccella S, Rossi C, Tikanmäki A, Visentin G. (2013) 'The ESA Lunar Robotics Challenge: Simulating Operations at the Lunar South Pole.'. J. Field Robotics, 30 Article number 5 , pp. 832-832.
  • Harris AW, Barucci MA, Fulchignoni M, Cano JL, Fitzsimmons A, Green SF, Hestroffer D, Lappas V, Lork W, Michel P, Morrison D, Payson D, Schäfer F. (2013) 'The European Union funded NEOShield project: A global approach to near-Earth object impact threat mitigation'. Acta Astronautica, 90 (1), pp. 80-84.
  • Forshaw JL, Lappas VJ. (2012) 'Architecture and systems design of a reusable Martian twin rotor tailsitter'. Acta Astronautica, 80, pp. 166-180.
  • Belo FAW, Birk A, Brunskill C, Kirchner F, Lappas V, Remy CD, Roccella S, Rossi C, Tikanmäki A, Visentin G. (2012) 'The ESA Lunar Robotics Challenge: Simulating operations at the lunar south pole.'. J. Field Robotics, 29 Article number 4 , pp. 601-626.
  • Harris AW, Barucci MA, Fulchignoni M, Cano JL, Fitzsimmons A, Green SF, Hestroffer D, Lappas V, Lork W, Michel P, Morrison D, Payson D, Schäfer F. (2012) 'The European Union funded NEOShield project: A global approach to near-Earth object impact threat mitigation'. Acta Astronautica,
  • Takahashi K, Lafleur T, Charles C, Alexander P, Boswell RW, Perren M, Laine R, Pottinger S, Lappas V, Harle T, Lamprou D. (2011) 'Direct thrust measurement of a permanent magnet helicon double layer thruster'. AMER INST PHYSICS APPLIED PHYSICS LETTERS, 98 (14) Article number ARTN 141503
  • Lappas V, Brunskill C, Smith B, Humphrey S, Makhlouta M, Baig S. (2011) 'Exploration of Lunar Craters Using a Tracked Microrover Concept for the ESA Lunar Robotics Challenge'. British interplanetary Society Journal of British Interplanetary Society, UK: 63 (7), pp. 267-277.
  • Steyn WH, Lappas V. (2011) 'Cubesat solar sail 3-axis stabilization using panel translation and magnetic torquing'. Aerospace Science and Technology,
  • Fernandez JM, Lappas VJ, Daton-Lovett AJ. (2011) 'Completely stripped solar sail concept using bi-stable reeled composite booms'. Acta Astronautica,
  • Fernandez JM, Lappas VJ, Daton-Lovett AJ. (2011) 'Completely stripped solar sail concept using bi-stable reeled composite booms'. Acta Astronautica, 69 (1-2), pp. 78-85.
  • Saaj CM, Lappas V, Schaub H, Izzo D. (2010) 'Hybrid propulsion system for formation flying using electrostatic forces'. ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER AEROSPACE SCIENCE AND TECHNOLOGY, 14 (5), pp. 348-355.
  • Lappas V, Riche D, Hall C, Fausz J, Wilson B, Babuska V, Beatty S, DeBlonk B. (2010) 'Erratum: Survey of technology developments in flywheel attitude control and energy storage systems (Journal of Guidance, Control, and Dynamics (2009) 32:2 (354-365))'. Journal of Guidance, Control, and Dynamics, 33 (1), pp. 286-286.
  • Lappas V, Riche D, Hall C, Fausz J, Wilson B, Babuska V, Beatty S, deBlonk B. (2010) 'Survey of Technology Developments in Flywheel Attitude Control and Energy Storage Systems (vol 32, pg 354, 2009)'. AMER INST AERONAUT ASTRONAUT JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, 33 (1), pp. 286-286.
  • Lappas V, Wie B. (2009) 'Robust Control Moment Gyroscope Steering Logic with Gimbal Angle Constraints'. AMER INST AERONAUT ASTRONAUT JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, Keystone, CO: 32 (5), pp. 1662-1666.
  • Lappas V, Richie D, Hall C, Fausz J, Wilson B. (2009) 'Survey of Technology Developments in Flywheel Attitude Control and Energy Storage Systems'. AMER INST AERONAUT ASTRONAUT JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, 32 (2), pp. 354-365.
  • Lappas V, Mengali G, Quarta AA, Gil-Fernandez J, Schmidt T, Wie B. (2009) 'Practical Systems Design for an Earth-Magnetotail-Monitoring Solar Sail Mission'. AMER INST AERONAUT ASTRONAUT J SPACECRAFT ROCKETS, 46 (2), pp. 381-393.
  • Richie DJ, Lappas VJ, Wie B. (2009) 'Practical steering law for small satellite energy storage and attitude control'. Journal of Guidance, Control, and Dynamics, 32 (6), pp. 1898-1911.
  • Schaub H, Lappas VJ. (2009) 'Redundant reaction wheel torque distribution yielding instantaneous L 2 power-optimal attitude control'. Journal of Guidance, Control, and Dynamics, 32 (4), pp. 1269-1276.
  • Richie DJ, Lappas VJ, Prassinos G. (2009) 'A practical small satellite variable-speed control moment gyroscope for combined energy storage and attitude control'. Acta Astronautica, 65 (11-12), pp. 1745-1764.
  • Richie DJ, Lappas VJ, Palmer PL. (2007) 'Sizing/optimization of a small satellite energy storage and attitude control system'. AMER INST AERONAUT ASTRONAUT JOURNAL OF SPACECRAFT AND ROCKETS, 44 (4), pp. 940-952.
  • Lappas V, Wie B, McInnes C, Tarabini L, Gomes L, Wallace K. (2007) 'Microsolar sails for Earth magnetotail monitoring'. AMER INST AERONAUT ASTRONAUT JOURNAL OF SPACECRAFT AND ROCKETS, 44 (4), pp. 840-848.
  • Peck MA, Streetman B, Saaj CM, Lappas V. (2007) 'Spacecraft formation flying using Lorentz forces'. BRITISH INTERPLANETARY SOC JBIS-JOURNAL OF THE BRITISH INTERPLANETARY SOCIETY, 60 (7), pp. 263-267.
  • Saaj CM, Lappas V, Richie D, Schaub H, Izzo D. (2007) 'Hybrid propulsion system for spacecraft swarm aggregation using Coulomb force'. BRITISH INTERPLANETARY SOC JBIS-JOURNAL OF THE BRITISH INTERPLANETARY SOCIETY, 60 (7), pp. 268-274.
  • Lappas V, Saaj C, Richie D, Peck M, Streetman B, Schaub H, Akella MR, Gearhart JW, Bishop RH, Treder AJ. (2007) 'Spacecraft formation flying and reconfiguration with electrostatic forces'. AMER ASTRONAUTICAL SOC SPACE FLIGHT MECHANICS 2007, VOL 127, PTS 1 AND 2, Sedona, AZ: 127, pp. 217-225.
  • Richie DJ, Lappas VJ. (2007) 'Saving mass in optimally sizing a small satellite energy storage and attitude control system'. Advances in the Astronautical Sciences, 127 PART 2, pp. 1161-1177.
  • Richie DJ, Lappas VJ, Asghar S. (2007) 'Combined singularity avoidance for variable speed control moment gyroscope clusters'. Advances in the Astronautical Sciences, 127 PART 2, pp. 1213-1224.
  • Van Der Ha JC, Lappas VJ. (2007) 'Long-term attitude drift of spinning spacecraft under solar radiation torques'. Journal of Guidance, Control, and Dynamics, 30 (5), pp. 1470-1479.
  • Mengali G, Quarta AA, Lappas VJ. (2007) 'Optimal steering law for the GeoSail mission'. Journal of Guidance, Control, and Dynamics, 30 (3), pp. 876-879.
  • Lappas V, Prassinos G, Baker A, Magnuss R. (2006) 'Wireless sensor motes for small satellite applications'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE ANTENNAS AND PROPAGATION MAGAZINE, 48 (5), pp. 175-179.
  • Prassinos G, Lappas V. (2006) 'Systems design for a 1-M resolution small satellite earth observation mission'. AIAA 57th International Astronautical Congress, IAC 2006, 4, pp. 2323-2331.
  • Van Der Ha JC, Lappas VJ. (2006) 'Long-term attitude drift of spinning spacecraft under solar radiation torques'. Advances in the Astronautical Sciences, 123 II, pp. 1123-1142.
  • Lappas VJ, Wokes S, Leipold M, Falkner P. (2006) 'Attitude control design for solar sail missions'. European Space Agency, (Special Publication) ESA SP, (606), pp. 191-194.
  • Saaj CM, Lappas V, Gazi V. (2006) 'Spacecraft swarm navigation and control using artificial potential field and sliding mode control'. IEEE 2006 IEEE International Conference on Industrial Technology, Vols 1-6, Bombay, INDIA: , pp. 2809-2814.
  • Lappas V, Wie B, McInnes C, Tarabini L, Gomes L, Wallace K, Fletcher K. (2006) 'Solar kites for earth magneto-tail monitoring'. ESA PUBLICATIONS DIVISION C/O ESTEC First Workshop on Innovative System Concepts, Proceedings, Noordwijk, NETHERLANDS: 633, pp. 73-80.
  • Lappas V, Wie B, van der Ha J, Fletcher K. (2006) 'Agile maneuvers for near earth object (NEO) fly-by missions'. ESA PUBLICATIONS DIVISION C/O ESTEC FIRST WORKSHOP ON INNOVATIVE SYSTEM CONCEPTS, PROCEEDINGS, Noordwijk, NETHERLANDS: 633, pp. 65-72.
  • Lappas V, Prassinos G, Van Der Ha J, Wie B. (2006) 'Autonomous attitude determination and control for low-cost deep space probes'. European Space Agency, (Special Publication) ESA SP, (606), pp. 269-278.

Conference papers

  • Lappas VJ, Forshaw JL, Pisseloup A, Salmon T, Joffre E, Chabot T, Retat I, Axthelm R, Barraclough S, Ratcliffe A, Bradford A, Kadhem H, Navarathinam N, Rotteveel J, Bernal C, Chaumette F, Pollini A, Steyn WH. (2014) 'RemoveDEBRIS: An EU Low Cost Demonstration Mission to Test ADR Technologies'. Toronto: 65th International Astronautical Congress
  • Fernandez JM, Schenk M, Prassinos G, Lappas V, Erb SO. (2013) 'Deployment Mechanisms of a Gossamer Satellite Deorbiter'. Noordwijk, The Netherlands: 15th European Space Mechanisms and Tribology Symposium 2013
  • Inumoh LO, Forshaw JL, Lappas VJ, Horri N. (2013) 'Three-Axis Tilted Wheel Experimental Results Using an Air-Bearing Table'. Beijing, China: 64th International Astronautical Congress
  • Ghiglino P, Forshaw JL, Lappas VJ. (2013) 'Online PID Self-Tuning Using an Evolutionary Swarm Algorithm with Experimental Quadrotor Flight Results'. Boston, US: AIAA Guidance, Navigation, and Control Conference
  • Forshaw JL, Lappas VJ, Briggs P. (2013) 'Indoor Experimentation and Flight Test Results for a Twin Rotor Tailsitter Unmanned Air Vehicle'. Boston, US: AIAA Guidance, Navigation, and Control Conference
  • Lappas V, Fernandez JM, Stohlman O, Viquerat A, Prassinos G, Theodorou T, Schenk M. (2013) 'Demonstrator Flight Missions at the Surrey Space Centre involving Gossamer Sails'. Glasgow: The Third International Symposium on Solar Sailing
  • Forshaw JL, Lappas VJ. (2012) 'Transitional Control Architecture, Methodology, and Robustness for a Twin Helicopter Rotor Tailsitter'. Minneapolis, US: AIAA Guidance, Navigation, and Control Conference
  • Kenyon S, Bridges CP, Liddle D, Dyer R, Parsons J, Feltham D, Taylor R, Mellor D, Schofield A, Linehan R. (2011) 'STRaND-1: Use of a $500 Smartphone as the Central Avionics of a Nanosatellite'. International Astronautical Federation Proceedings of the 2nd International Astronautical Congress 2011, (IAC ’11), Cape Town, South Africa: 62nd International Astronautical Congress 2011, (IAC ’11)

    Abstract

    STRaND-1 is the first in a series of Surrey Satellite Technology Ltd. (SSTL)-Surrey Space Centre (SSC) collaborative satellites designed for the purpose of technology path finding for future commercial operations. It is the first time Surrey has entered the CubeSat field and differs from most CubeSats in that it will fly a modern Commercial Off The Shelf (COTS) Android smartphone as a payload, along with a suite of advanced technologies developed by the University of Surrey, and a payload from the University of Stellenbosch in South Africa. STRaND- 1 is also different in that anyone (not just from the space engineering or space science community) will be eligible to fly their “app" in space, for free. STRaND-1 is currently being manufactured and tested by volunteers in their own free time, and will be ready for an intended launch in the first quarter of 2012. This paper outlines the STRaND pathfinder programme philosophy which challenges some conventional space engineering practises, and describes the impact of those changes on the satellite development lifecycle. The paper then briefly describes the intent behind the design of STRaND-1, before presenting details on the design of the nanosatellite, focussing of the details of the innovative new technologies. These technologies include two different propulsion systems, an 802.11g WiFi experiment, a new VHF/UHF transceiver unit and a miniature 3-axis reaction wheel assembly. The novel processing setup (which includes the smartphone) is discussed in some detail, particularly the potential for outreach via the open source nature of Google's Android operating system. A stepthrough of the planned concept of operations is provided, which includes a possible rendezvous and inspection objective, demonstrating equal or improved capability compared to SNAP-1 with a reduced total system mass. Finally, data from the test campaign is presented and compared against other notable CubeSats known for their advanced capabilities. Rendered images of STRaND-1 are shown in Fig. I and are discussed later in the paper.

  • Forshaw JL, Lappas VJ. (2011) 'High-Fidelity Modeling and Control of a Twin Helicopter Rotor Tailsitter'. Oregon, US: AIAA Guidance, Navigation, and Control Conference
  • Bridges C, Underwood C, Lappas V, Kenyon S. (2011) 'STRaND-1: The world's first smartphone nanosatellite'. 2nd International Conference on Space Technology, ICST 2011,
  • Richie DJ, Lappas VJ, Prassinos G. (2008) 'A practical small satellite variable-speed control moment yroscope for combined energy storage and attitude control'. AIAA/AAS Astrodynamics Specialist Conference and Exhibit,
  • Nasir Adeli S, Lappas V, Wie B. (2008) 'Scalable bus-based attitude control system for solar sails'. International Astronautical Federation - 59th International Astronautical Congress 2008, IAC 2008, 8, pp. 5215-5222.
  • Richie DJ, Lappas VJ, Wie B. (2008) 'A practical variable-speed control moment gyroscope steering law for small satellite energy storage and attitude control'. AIAA/AAS Astrodynamics Specialist Conference and Exhibit,
  • Vladimirova T, Bridges CP, Prassinos G, Wu X, Sidibeh K, Barnhart DJ, Jallad A-H, Paul JR, Lappas V, Baker A, Maynard K, Magness R, Arslan T, Stoica A, Suess M, Keymeulen D, Higuchi T, Magness R, Aydin N, Erdogan AT. (2007) 'Characterising wireless sensor motes for space applications'. IEEE COMPUTER SOC NASA/ESA Conference on Adaptive Hardware and Systems, Proceedings, Univ Edinburgh, Edinburgh, SCOTLAND: 2nd NASA/ESA Conference on Adaptive Hardware and Systems, pp. 43-50.
  • Kennedy F, Coxhill I, Kormos T, Imre E, Fielding J, Atek S, Lappas V, Freebody M. (2006) 'Prometheus: A low-cost microsatellite flyby mission of 4179 Toutatis'. PERGAMON-ELSEVIER SCIENCE LTD ACTA ASTRONAUTICA, European Space Res & Technol Ctr, Noordwijk, NETHERLANDS: 5th IAA International Conference on Low-Cost Planetary Missions 59 (8-11), pp. 834-844.
  • Lappas VJ, Wie B. (2006) 'Advanced satellite bus technology for near-term solar sail missions'. Collection of Technical Papers - AIAA/AAS Astrodynamics Specialist Conference, 2006, 1, pp. 570-588.
  • Barnhart DJ, Vladimirova T, Ellery A, Lappas VJ, Underwood CI, Sweeting MN. (2006) 'Utilising the EyasSAT concept in space systems engineering courses at the University of Surrey'. AIAA 57th International Astronautical Congress, IAC 2006, 13, pp. 9070-9083.
  • Lappas V, Wie B. (2006) 'Robust CMG steering logic with gimbal angle constraints'. Collection of Technical Papers - AIAA/AAS Astrodynamics Specialist Conference, 2006, 2, pp. 1425-1438.
  • Shaw PV, Lappas VJ. (2006) 'Mathematical modeling of high effeciency pulsed plasma thrusters for microsatellites'. AIAA 57th International Astronautical Congress, IAC 2006, 10, pp. 6681-6693.
  • Lappas V, Oosthuizen P, Madle P, Cowie L, Yuksel G, Fertin D. (2006) 'Micro CMGs for agile small satellites: Design and in-orbit tests'. European Space Agency, (Special Publication) ESA SP, (606), pp. 667-675.

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