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U.S. Rep. Doug Lamborn (R-Colo.), a co-chair of the recently established House Space Force Caucus, said Oct. 28 that orbital debris is a major threat to a prosperous space economy and that better space situational awareness is crucial to protecting the sector. SpaceNews
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The European Space Agency said Oct. 29 that COVID-19 and technical issues would delay the maiden launch of Ariane 6 to 2022, prompting it to ask participating members states for additional funding for the rocket's development. SpaceNews
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The National Security Space Association seeks reforms in “space security policy, practices and governance structures.” SpaceNews
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Braxton, based Colorado Springs, will be merged into Parsons’ space and geospatial business. SpaceNews
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Finnish radar satellite operator Iceye announced Oct. 29 that Jerry Welsh, Iceye chief operating officer and chief financial officer, is taking the helm of Iceye US as CEO. SpaceNews
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Thu, 29 Oct 2020 07:53:55 +0000
A Rocket Lab Electron rocket successfully placed 10 satellites into orbit for two customers who lost payloads on a launch failure earlier this year. SpaceNews
Thu, 29 Oct 2020 01:59:56 +0000
General Atomics announced Oct. 28 the acquisition of Guidestar Optical Systems, a space and defense company based in Longmont, Colorado, which it plans to integrate into the General Atomics Electromagnetic Systems (GA-EMS) group. SpaceNews
Wed, 28 Oct 2020 22:32:43 +0000
The Space Force has been the subject of snark since it was first proposed. But the naysayers are coming around, Air Force Secretary Barbara Barrett said. SpaceNews
Wed, 28 Oct 2020 21:22:35 +0000
Launchspace Technologies Corp. announced a contract Oct. 28 with Airbus to test its Orbital Debris Collection and Spacecraft Shielding payload for 12 months on the Bartolomeo platform on the International Space Station. SpaceNews
Wed, 28 Oct 2020 19:54:27 +0000
D-Orbit of Italy demonstrated the first commercial last-mile delivery service when it finished a two-month campaign Oct. 28 to drop off 12 Planet SuperDove Earth-imaging satellites. SpaceNews
Wed, 28 Oct 2020 14:25:42 +0000
Air Force Col. Michael “Hopper” Hopkins, commander of NASA’s SpaceX Crew-1 mission, will be commissioned into the U.S. Space Force. SpaceNews
Wed, 28 Oct 2020 11:31:01 +0000
The Federal Communications Commission approved the sale of OneWeb to the British government and Bharti Global Oct. 27, as rival SpaceX started a public beta test of its Starlink system. SpaceNews
Wed, 28 Oct 2020 04:21:19 +0000
The Federal Communications Commission approved the creation Oct. 27 of a 5G Fund for Rural America to distribute as much as $9 billion over the next decade to extend 5G wireless broadband connectivity to rural communities. SpaceNews
Wed, 28 Oct 2020 00:21:53 +0000
The Aerospace Corp. is calling for U.S. government agencies to work together to develop space solar power technologies in a paper that underscores the importance of collaborating with international partners. SpaceNews
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  • CV: GNC Engineer

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    Personal information
     Name:<withheld>
     Age:<withheld>
     Country:<withheld>
     Location:<withheld>
    Contact information
     Email:<withheld>
     Phone:<withheld>
     Mobile:<withheld>
    Candidate Profile
     Date Submitted:01-01-2012
     Last Modified:01-01-2012 (07:23)
    Job information
     Current job:GNC Engineer
     Employment Term:Either
     Job location:Own country
     Date available:immediately
     Industry:Satellite Manufacturers and Subcontractors, Satellite Operators, , , Launch Systems
     KeywordsI am the only GNC Engineer able to tune guidance and control systems for complex aerospace maneuvers without using gain scheduling.
    CV
    RESEARCH AND DEVELOPMENT SCIENTIST/ENGINEER
    Guidance, Navigation, and Control Algorithms ~ Software Development ~ Computational Theory and Design ~ System Analysis and Simulation ~ Proposal Development
     
    Secret Security Clearance 
     
    DISTINGUISHED ACHIEVEMENT
    Linear Time Invariant (LTI) Six Degree of Freedom Differential Equations:
    Only scientist/engineer in the world who can devise GNC algorithms for difficult aerospace maneuvering scenarios without using gain scheduling or other types of nonlinear control.
    Currently developing a full fidelity 6-DOF state feedback control loop with constant gains using quaternion mathematics to separate inertial and body rotational dynamics.
    Also developing a quaternion Kalman filter with constant Kalman gains.
     
    PROFESSIONAL SUMMARY
    Guidance, Navigation, and Control (GNC) Engineer                                    2010 to 2011
    Masten Space Systems, Mojave, CA
    Six degree of freedom (6-DOF) suborbital vertical takeoff vertical landing (VTVL) rocket flight simulation
    o Created flight profiles up to 30 km in altitude in preparation for NASA CRuSR launches.
    o Modified vehicle properties (mass properties, engine characteristics, rcs, etc.) and analyzed simulation results for new suborbital VTVL rocket to ensure attitude control system stability and nominal mission conditions.
    o Determined abort and terminate parameter limits using simulation trajectory results.
    Hardware in the Loop (HWIL) simulation
    o Validated flight profiles up to 5 km in altitude for NASA CRuSR launches.
    o Analyzed simulation results for planned vehicle flight tests to ensure parameters were properly set.
    o Validated abort and terminate parameter limits using simulation results.
    Operational engine/vehicle testing
    o Issued commands remotely to onboard flight management system (activating/deactivating valves, testing various engine components, initiating engine ignition) during field testing.
    o Created a checklist with step by step instructions for rocket flight preparations and suggestions for dealing with off nominal conditions.
    NASA SBIR Proposal Submission (Navigation Flight Dynamics Software and Technologies Topic)
    o Proposed using a quaternion exponential Kalman (QEK) filter to map the nonlinear state equations to an equivalent linear space to meet NASA’s objective of improving the navigation filter for GNC systems.
     
    Guidance, Navigation, and Control (GNC) Engineer                               2008 to 2009
    Miltec Missiles and Space, Huntsville, AL
    Foreign anti-tank 6-DOF missile simulation
    o Debugged and modified existing 6-DOF missile simulation developed in C++.
    o Tested simulation autopilot with step commands, zero acceleration and step acceleration commands.
    o Modified and debugged line of sight (LOS) proportional derivative guidance subroutine using azimuth and elevation angles to the missile and target, including guidance gain tuning for trajectory optimization.
    o Integrated missile simulation into a package containing a scene generator and a missile/target tracker, including synchronizing the different applications and retuning the guidance gains.
    o Developed a roll autopilot to keep the missile at a zero roll angle.
    o Shot missile ten degrees off boresight from the target to test the guidance system and autopilot.
    Upper atmospheric hypersonic glider 6-DOF simulation
    o Conducted linear stability analysis on glider endo- and exo-atmospheric maneuvers.
    o Conducted research into and began development of a dynamic inversion autopilot.
    o Began applying quaternion exponentials to autopilot design to improve control system robustness
     
    Doctoral Student Research Assistantship, Old Dominion University, Norfolk, VA                           2003 to 2008
    Invented a new type of eigenvalue for quaternion mathematics to facilitate development of a linear time invariant (LTI) set of 6-DOF equations.  Currently formulating a quaternion frequency domain method of solution.
    Dissertation research in inertial guidance, navigation and attitude control.
    Presented conference papers at professional AIAA conferences/exhibits.
     
    Research Scientist and Engineer (Mathematician)                                         1990 to 2003
    Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA                                                               
    SLBM Research and Analysis Division
    o Developed a simulation for an experimental flapped re-entry body and analyzed the resulting trajectory.  
    o Reduced 6-DOF reentry simulation execution time by two-thirds by fitting a time varying sine wave to the quaternion components and switching the state vector from angular velocity to quaternion first derivative.
    o Investigated further 6-DOF modifications using quaternion mathematics.  
    o Developed methods of optimizing EMP attacks.
    o Researched application of genetic algorithms, simulated annealing, and other combinatorial algorithms to sequencing and grouping of missile attacks.
    o Analyzed terrain effects on the fuzing system, and conducted other fuze studies.
    o Developed a graphical program for analyzing plume impingement on re-entry bodies.
    SLBM Software Development Division
    o Developed various systems and applications software programs.
    o Replaced the Runge-Kutta method with a predictor-corrector method in a 6-DOF re-entry simulation in the upper part of the atmosphere and combined with other modifications to reduce the execution time by 85%.
    o Developed an object-oriented 6-DOF re-entry simulation.
     
    Career Note: Additional Position as Systems Engineer (Contractual) for Aerodyne Industries, LLC 
    Antares six degree of freedom launch vehicle simulation
    o Added Monte Carlo capabilities for mass properties dispersions of launch vehicle elements.
     
    Education
     
    Ph.D. in Aerospace Engineering, Old Dominion University, admitted to candidacy, expected graduation              Fall 2011
    Norfolk, VA
     
    Ph.D. work in Computational Sciences and Informatics (Mathematics track), George Mason University,            1995-2000
    Fairfax, VA
     
    Master of Science in Computer Science, Virginia Polytechnic Institute and State University,                      December 1994
    Blacksburg, VA
     
    Bachelor of Science in Mathematics (computational track), Pennsylvania State University, State College, PA    May 1990
     
    Publications
     
    Davailus, G.P.; “Linear Time Invariant Formulation of the Gyroscopic Problem using Quaternion Mathematics”. AIAA-2011-1224, 49th AIAA Aerospace Sciences Meeting; Orlando, FL., January 2011
     
    Davailus, G.P.; Newman, B.A.; “The Application of Quaternion Algebra to Gyroscopic Motion, Navigation, and Guidance”, AIAA-2005-5945, AIAA Guidance, Navigation, and Control Conference and Exhibit; San Francisco, CA., August 2005
     
    Davailus, G.P.; “The Transformation of Oscillatory Equations in Six Degree of Freedom Trajectory Simulations Involving Coordinate Transformations”, M.S. Thesis, Department of Computer Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 1994.

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