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Mon, 19 Mar 2018 17:49:42 +0000
For the space-based infrared SBIRS satellites 5 and 6, the Air Force says the per-unit cost went down 12 percent — from $1.9 billion to $1.6 billion.
Mon, 19 Mar 2018 10:39:02 +0000
Companies that are developing small launch vehicles or who provide rideshare launch services say they expect new Chinese launch vehicles to drive down launch prices, raising concerns among some of unfair competition.
Sun, 18 Mar 2018 09:26:31 +0000
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Fri, 16 Mar 2018 20:56:55 +0000
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Fri, 16 Mar 2018 16:49:52 +0000
To prevent collisions in space, nations with advanced orbital monitoring abilities need to share data with each other. Russia, being skilled in space situational awareness (SSA), should be part of the global effort to protect the space environment, experts said March 15 at the Satellite 2018 conference here.
Fri, 16 Mar 2018 13:48:13 +0000
In its budget proposal for the coming year, the U.S. Air Force is trying to send the same message to foreign adversaries and critics at home: the service definitely is not underestimating threats the United States and its allies face in space.
Thu, 15 Mar 2018 23:57:04 +0000
Assistant Secretary of Defense Kenneth Rapuano: “The president is very interested in ensuring that the department is best organized and equipped to achieve our vital missions in space."
Thu, 15 Mar 2018 20:17:02 +0000
The hand-wringing continues at the Pentagon over how to respond to Chinese and Russian missile advances.
Thu, 15 Mar 2018 17:18:23 +0000
With a stopgap spending bill set to expire in just over a week, House and Senate appropriators are continuing to negotiate provisions of an omnibus bill, including funding levels for some NASA programs.
Thu, 15 Mar 2018 15:22:31 +0000
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Thu, 15 Mar 2018 12:52:06 +0000
The introduction of 5G services will bring users globally the ability to have true anytime, anywhere capabilities to support a myriad of user devices and applications never imagined.
Thu, 15 Mar 2018 11:17:36 +0000
The U.S. Senate confirmed Jeffrey DeWit as NASA's new chief financial officer March 14, completing an expedited process starkly different than the one for the agency's next leader.
Thu, 15 Mar 2018 03:13:13 +0000
United Launch Alliance plans to increase its activities in the commercial launch market using both the current Atlas and future Vulcan rockets, while acknowledging that the U.S. government will remain its major customer for the foreseeable future.
Thu, 15 Mar 2018 02:39:35 +0000
Satellite manufacturers say they are trying to protect their component suppliers from the drought of commercial telecom spacecraft that threatens to put such companies out of business.
Wed, 14 Mar 2018 23:34:12 +0000
House Armed Services Committee Chairman Mac Thornberry: "We will not relax our effort on space reforms. This topic is just too important.”
Wed, 14 Mar 2018 23:24:56 +0000
WASHINGTON — The Air Force on Wednesday awarded two major launch contracts to SpaceX and United Launch Alliance. Under the Evolved Expendable Launch Vehicle (EELV) program, SpaceX received a $290 million firm-fixed-price contract for three GPS 3 missions. ULA was awarded a $351 million firm-fixed-price deal for Air Force Space Command (AFSPC)-8 and AFSPC-12 satellites […]
Wed, 14 Mar 2018 17:32:25 +0000
Despite uncertainty about who will lead the agency after the end of April, NASA's current acting administrator says he expects little change in the agency's activities in the near future.
Wed, 14 Mar 2018 17:14:02 +0000
The downward trend of satellite capacity pricing, brought about largely by the increase in more powerful high-throughput satellites, has prices trending between 35 and 60 percent lower than where they were two years ago, according to Northern Sky Research.
Wed, 14 Mar 2018 15:06:37 +0000
“We can put a satellite phone in the hands of folks who don’t know how to use it and it won’t make a hill of beans difference,” said Ken Flowers, Iridium Communications vice president government.
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    Personal information
    Contact information
    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.
    Guidance, Navigation, and Control Algorithms ~ Software Development ~ Computational Theory and Design ~ System Analysis and Simulation ~ Proposal Development
    Secret Security Clearance 
    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.
    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.
    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
    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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