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Wed, 13 Nov 2019 12:56:40 +0000
China launches six remote sensing satellites into orbit with two launches inside three hours from sites in north China. SpaceNews.com
Wed, 13 Nov 2019 11:00:40 +0000
A new study says companies can build, launch and operate constellations to gather global imagery with a resolution of one meter for a fraction of the cost of previous constellations. SpaceNews.com
Wed, 13 Nov 2019 10:29:40 +0000
A NASA official warned that extended delays in finalizing a fiscal year 2020 budget for the agency could have implications for its ability to stay on schedule for returning humans to the moon in 2024. SpaceNews.com
Wed, 13 Nov 2019 00:14:41 +0000
Two astronauts are set to begin a series of spacewalks this week to repair an instrument outside the International Space Station that was never designed to be serviced in orbit. SpaceNews.com
Tue, 12 Nov 2019 22:10:29 +0000
Will Roper said an extended CR is especially damaging for space "where we are trying to build systems to be survivable." SpaceNews.com
Tue, 12 Nov 2019 17:12:03 +0000
Megaconstellation startup OneWeb and its largest investor Softbank asked the New York Supreme Court to dismiss a lawsuit from Intelsat, arguing that Intelsat failed to finalize rights it claimed it had to resell OneWeb satellite capacity.  SpaceNews.com
Tue, 12 Nov 2019 13:40:20 +0000
The senior secured loan will finance BlackSky’s infrastructure and product development. SpaceNews.com
Tue, 12 Nov 2019 00:05:39 +0000
A NASA space telescope recently completed a major review and is making good progress, project officials say, despite uncertainty about its funding. SpaceNews.com
Mon, 11 Nov 2019 22:34:00 +0000
Readers voted in October to select the individuals, organizations and accomplishments most deserving of recognition at the 2019 SpaceNews Awards for Excellence and Innovation. Here is the complete list of the Readers' Choice Award winners for each category. SpaceNews.com
Mon, 11 Nov 2019 16:33:48 +0000
SpaceX completed its second launch of 60 Starlink satellites Nov. 11, making its own system the largest commercial telecommunications satellite constellation in orbit. SpaceNews.com
Sun, 10 Nov 2019 15:34:42 +0000
The Russian company that markets launch vehicles commercially says it doesn’t expect the new Soyuz-5 medium-lift rocket to be available until the mid-2020s, despite leveraging existing designs and facilities. SpaceNews.com
Fri, 08 Nov 2019 22:19:39 +0000
Telesat Canada will likely choose the winner of a now three-way race to build its low Earth orbit broadband constellation in the first few months of 2020 instead of this year, CEO Dan Goldberg said Nov. 5.  SpaceNews.com
Fri, 08 Nov 2019 18:43:04 +0000
The Infrastructure Asset Pre-Assessment (IA-Pre) program will be run by the Air Force Space Command’s commercial satellite communications office. SpaceNews.com
Fri, 08 Nov 2019 17:48:35 +0000
OneWeb has delayed the beginning of its regular launch campaign by a month to allow more testing of its small broadband satellites.  SpaceNews.com
Fri, 08 Nov 2019 12:15:06 +0000
A NASA astronaut flying to the International Space Station next spring could be the only American on the station for an extended period because of uncertainty in the status of commercial crew vehicles. SpaceNews.com
Thu, 07 Nov 2019 23:05:29 +0000
Avio CEO Giulio Ranzo said during a Nov. 7 earnings call, said Vega is on track for a return to flight by March, though what payload will launch on the mission is still to be determined.  SpaceNews.com
Thu, 07 Nov 2019 21:54:50 +0000
Boeing said Nov. 7 that a misplaced pin prevented a parachute from deploying during a pad abort test of its CST-100 Starliner vehicle three days earlier, the only flaw in a key test of that commercial crew vehicle. SpaceNews.com
Thu, 07 Nov 2019 21:00:44 +0000
Fiber Optic Manufacturing in Space (FOMS) Inc. presented the results Nov. 7 of its successful campaign to produce optical fiber on the International Space Station. SpaceNews.com
Thu, 07 Nov 2019 20:57:54 +0000
DoD wants to increase awareness of the threats the nation faces in space but classification is a problem. SpaceNews.com
Thu, 07 Nov 2019 14:00:04 +0000
Ursa Space Systems, a geospatial analytics company that specializes in the application of synthetic aperture radar (SAR) data, raised $15 million in a Series B funding round led by Razor’s Edge Ventures. SpaceNews.com
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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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