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Mon, 16 Jul 2018 19:27:06 +0000
A solid rocket booster designed for both the Ariane 6 and Vega C next-generation launchers completed a successful test firing Monday, clearing a hurdle for the maiden flights of both vehicles. SpaceNews.com
Mon, 16 Jul 2018 17:58:13 +0000
Ken Gabriel, CEO of Draper Labs: The idea of small satellites making up large constellations is a “powerful shift." SpaceNews.com
Mon, 16 Jul 2018 16:54:04 +0000
Virgin Orbit says an agreement that could lead to LauncherOne missions from an English airport is part of an effort to both better meet the needs of its customers as well as support the U.K. space industry. SpaceNews.com
Mon, 16 Jul 2018 13:03:49 +0000
With the announcement that Scotland will be home to Britain's first spaceport, the U.K. is on the road to offering a one-stop-shop for building, operating and now launching satellites. SpaceNews.com
Mon, 16 Jul 2018 09:14:34 +0000
The British government announced July 16 that it will provide funding to two companies, including an American aerospace giant, who plan to use a newly announced launch site in Scotland. SpaceNews.com
Sun, 15 Jul 2018 21:58:30 +0000
After years of study and consideration, the British government announced July 15 that it will start development of a new spaceport in northern Scotland, while an English airport signed a deal that could also lead to launches from its facility. SpaceNews.com
Sun, 15 Jul 2018 19:39:31 +0000
The space market worldwide has averaged $269 billion over the past five years, growing more than 5 percent each year. SpaceNews.com
Sun, 15 Jul 2018 08:03:46 +0000
The military wants to apply quantum computing to secure communications and inertial navigation in GPS denied environments. SpaceNews.com
Fri, 13 Jul 2018 20:43:08 +0000
On his first foreign trip since taking office nearly three months ago, NASA Administrator Jim Bridenstine traveled to Israel this week to meet with the country’s prime minister and other officials. SpaceNews.com
Fri, 13 Jul 2018 19:21:26 +0000
Gogo, an inflight connectivity provider leasing capacity on dozens of satellites, bulldozed its old business plan July 13 amid looming concerns over unprofitability, encroaching debt deadlines, and a potential buyout. SpaceNews.com
Thu, 12 Jul 2018 21:57:26 +0000
The White House nominated a veteran Senate aide with little space experience to be NASA’s deputy administrator July 12, a month after the agency’s administrator said he wanted someone with technical expertise for the job. SpaceNews.com
Thu, 12 Jul 2018 19:00:17 +0000
Blue Origin will begin flying two customers on the same New Glenn rocket after the launch vehicle has performed five missions with solo customers, according to Ted McFarland, Blue Origin’s commercial director of Asia-Pacific business. SpaceNews.com
Thu, 12 Jul 2018 18:42:28 +0000
“We are going to need a bigger boat,” FCC Chairman Ajit Pai said July 12, quoting the 1975 movie Jaws as a metaphor for the challenge of handling 5G needs. “Or in our case, more spectrum.” SpaceNews.com
Wed, 11 Jul 2018 22:15:26 +0000
China’s state-owned fleet operator is making forward-leaning investments in high-throughput satellites and low-Earth-orbit constellations without worrying, at least initially, about whether these projects are backed by sound business plans. SpaceNews.com
Wed, 11 Jul 2018 20:54:55 +0000
Amid growing concerns about commercial crew delays, a GAO report recommended NASA share more schedule information with Congress and develop contingency plans to maintain access to the International Space Station. SpaceNews.com
Wed, 11 Jul 2018 20:27:30 +0000
Using free data from the European Space Agency, a startup in Finland created a geospatial information service that is entirely enabled by artificial intelligence. SpaceNews.com
Wed, 11 Jul 2018 17:42:16 +0000
U.S. aerospace and defense in 2017 posted a positive trade balance. But there are concerns that escalating trade wars could hurt future growth. SpaceNews.com
Wed, 11 Jul 2018 14:00:10 +0000
A Silicon Valley startup developing electric propulsion systems for satellites has raised $10 million and added the billionaire founder of LinkedIn to its board. SpaceNews.com
Wed, 11 Jul 2018 13:46:27 +0000
Intelsat-901, a 17-year-old communications satellite running low on propellant, is awaiting a first-of-its-kind service call from a robotic spacecraft carrying a fresh tank of fuel. SpaceNews.com
Wed, 11 Jul 2018 02:27:35 +0000
Kepler Communications, a Canadian startup designing a network of 140 telecom cubesats, has teamed up with the Satellite Applications Catapult in the U.K. to build a third and final prototype before pressing on with the full constellation. SpaceNews.com
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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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