Latest Space News
Wed, 18 Jul 2018 18:45:22 +0000
Earth observation startup Planet laid off dozens of employees July 13. The move affected less than ten percent of the firm's workforce, a company spokesperson said. SpaceNews.com
Wed, 18 Jul 2018 16:23:07 +0000
Blue Origin conducted a successful test flight of its New Shepard suborbital vehicle July 18 that demonstrated its crew capsule escape system. SpaceNews.com
Wed, 18 Jul 2018 15:00:23 +0000
Maxar announced a $1.3 million deal with the UK Space Agency to develop space robotics technology in the United Kingdom. SpaceNews.com
Wed, 18 Jul 2018 14:37:02 +0000
Trump administration officials are at the Farnborough Airshow in the United Kingdom this week on a mission to sell American aerospace and weapons. SpaceNews.com
Wed, 18 Jul 2018 14:17:49 +0000
As Astrobotic prepares to compete for NASA lunar payload delivery contracts, the company has signed an agreement with Dynetics for the last major component of its lunar lander. SpaceNews.com
Tue, 17 Jul 2018 20:50:51 +0000
NASA Administrator Jim Bridenstine said July 17 that he’s had good discussions with European officials about potential cooperation on NASA’s plans to return to the moon. SpaceNews.com
Tue, 17 Jul 2018 20:16:24 +0000
Lockheed VP: “As the UK develops its space industry further, I think you’ll see bigger economics from the mini-satellites and the value they create from data." SpaceNews.com
Tue, 17 Jul 2018 16:20:46 +0000
While Lockheed Martin continues to suggest it will use Rocket Lab’s Electron rocket at a Scottish launch site announced at the beginning of this week, company officials said July 17 they have yet to formally select a vehicle to fly at the site. SpaceNews.com
Tue, 17 Jul 2018 00:28:34 +0000
Maxar Technologies on July 16 purchased Neptec, a Canadian company with robotic expertise deemed useful for in-space activities like satellite servicing and building space stations. SpaceNews.com
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
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    Personal information
     Name:<withheld>
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    Contact information
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    Candidate Profile
     Date Submitted:03-03-2013
     Last Modified:03-03-2013 (08:20)
    Job information
     Current job:Principal Systems Engineer
     Employment Term:Permanent
     Job location:Anywhere
     Date available:immediately
     Industry:Satellite Manufacturers and Subcontractors, Satellite Operators, , , Consulting/Engineering Services, Space Tourism
     Keywordsorbit mechanics, astrodynamics, trajectory, orbit determination, satellite coverage, simulation, software development, FORTRAN, VMS, VAX
    CV

                                                                Professional Experience Summary

                                               Aerospace Engineer – Orbit Analyst – Software Engineer

    20+ years experience in orbital mechanics and astrodynamic analyses, design, simulation development and modeling with specialization in Orbit Determination (OD) and parameter estimation, and satellite constellation earth coverage design & analysis.

    Supported the SGT/Raytheon Orbit software program contract for the proposed New Space Fence, designed to maintain the catalog of space objects that are significantly smaller and many times more numerous than the current system. The program segments process design state of the art phased array radar high accuracy measurements which are in turn form 1) the initial single pass OD estimates, 2) compute correlation measures for earlier ephemeris and covariance estimates, 3) update correlated orbital ephemeris states and covariance, and 4) generate propagated ephemeris and covariance predictions at the Fence crossing time epochs.

    Supported the Naval Space Command DB15 OD Program (classified) software development & test, and configuration control for 13 years. The work included implementing software enhancements for 1) higher accuracy earth gravity and polar motion modeling, 2) extended duration satellite DV thrusting, 3) solar panel radiation pressure and panel dynamics 4) numerous other force modeling modifications, 5) implementation of modified Doppler measurement types, 6) robust and refined estimation techniques, and 7) responsible for the OD software installations and checkout at the mission ops ground support stations.

    Software test & development in support of a concept & design phase of a program for a unique open-loop Pitch Control attitude control program (PCS), formulated by Dr. J. Vahlberg which proved as a key development that extended the Navy/Air Force DB15 multi-constellation satellite mission many years beyond the expected mission life plan. The PCS program was developed as a workaround after critical satellite sub-system failures threatened to terminate the multi-satellite classified mission.

    Prior to working for SGT and Raytheon, Mr. Elsner worked for Lockheed Missiles & Space Co. (now, Lockheed-Martin) Space Systems Division Orbital Mechanics Dept. in Sunnyvale, CA. The work involved a variety of orbit analysis tasks and developing orbital software simulations employing general perturbation models. Primary focus included analysis and software simulation development for evaluating satellite & constellation earth coverage, satellite payload trade study performance assessments, and other studies for numerous proposed DOD and NASA satellite systems.

    Developed orbital simulations for deriving cross-range maneuver requirements for a proposed eight-man re-entry atmospheric lifting body vehicle (Assured Crew Return Vehicle, or ACRV) to serve as a lifeboat for the (then planned) International Space Station, or ISS. In addition, simulations were developed for demo and conducting trade studies and Monte-Carlo analysis for evaluating de-orbit landing site selection options.

    The above software development work and analysis were performed on a variety of computer platforms such as Alpha, SUN, and HP Workstations, as well as PC, VAX Mainframe, CRAY, and others. Operating systems included VMS, VAX, UNIX, and PC Windows. The programming was done primarily in FORTRAN 77 & 95, VMS/VAX command scripts, MS Windows batch scripts, and some C and UNIX.

    Sgt Inc., Greenbelt, MD              Aug 2007 – Aug 2012

    Principal Systems Engineer

    Provided software simulation development, modeling, and support for Raytheon/SGT proposed New Space Fence system.  The modeling and simulation tasks were performed on PC Windows platforms with computational programming code performed in FORTRAN 95 and PC Windows scripts.

    The Space Fence software development involved the programming, test, and analysis for automated functional blocks for orbit object sequenced OD processing, object correlations, and propagated orbit state and covariance. Scenarios for up to several hundred thousand orbit objects were simulated and the SGT program consistently correctly correlated objects much better than spec requirements.  The Space Fence task required knowledge of special perturbation (SP) earth orbit models, orbit determination (OD), covariance analysis, astrodynamic, Maximum Likelihood correlation, inertial & rotating coordinate systems and transformations, and implementation of the SGT and NASA Goddard GEODYN Precision OD program.  Software configuration control management was maintained for frequent program development enhancements and updates.

    Raytheon Technical Services Co.  Lanham, MD                Oct 1994 – Aug 2007

    Principal Systems Engineer

    Software enhancement modifications, testing and development of the Naval Space Command DB15 satellite surveillance system orbit determination (OD) program.  The primary responsibilities included the development & test, validation, software maintenance, and updates to the OD Estimation Program and the corresponding special perturbation (SP) orbit propagation program software executed at the global remote station sites.

    Enhancements to the DB15 OD Program provided orbital accuracy improvement on the order of 2-3x over the original operational program for the multi-satellite missions. Enhancements included implementing a 40x40 WGS84 earth gravity model; automated updates for earth spin axis orientation, removal of Doppler station survey biases, variable weighted fit-span option which demonstrated significantly improved orbit accuracy spanning solar/atmospheric events. In addition, programming changes for the Y2K transition epoch.

    Conducted a comprehensive error analysis studies to accurately model satellite thrusting force for long duration thrusts, as well as consecutive rev thrusting. This enabled mission planners more flexibility to command longer duration, larger V orbit adjust maneuvers with small ephemeris errors for remote station prediction accuracy.

    Provided a satellite station-keeping simulation program and software tools for the mission planners to much more accurately and optimally plan satellite station-keeping thrusts. The program utilized a position-velocity phase-plane control concept which resulted in reducing the total number of thrusts, maintaining tighter station-keeping control, and also provided advance alerts for mission planners when relative position rates were high.

    Created a simulation for optimizing satellite electrical power for reduced solar panel functionality when multiple solar panel step-motor failure events occurred on multiple satellites. The analysis led to implementing optimal fixed configurations for a range of angles (solar/orbit geometry) on multiple satellites. This operational implementation significantly restored the mission payload tasking level near the original spec for full panel function.

    Supported design phase testing and development of the PCS (Pitch-Control-System) open-loop attitude control program (devised by Dr. J. Vahlberg) that was the key factor in extending the mission life for the DB15 mission for up to 8 years beyond its designed life. Also provided PCS daily operations monitoring, optimized momentum wheel controls generation and working in concet with mission ops crews that extended the overall mission life.

    Lockheed Missiles & Space Co. (Lockheed-Martin) Sunnyvale,CA   1985 – 1994

    Sr. Research Engineer

    Supported orbit analysis tasks as part of the Space System Division (SSD) Orbital Mechanics Group on DOD and NASA proposed satellite programs, including SDI Boost Surveillance Tracking System (BSTS), MILSTAR, DMSP, ACRV (ISS), IRIDIUM, and numerous others.

    Specialization in satellite constellation design and earth coverage simulation tools, ground station revisit time analysis, derived BSTS (classified) payload earth coverage requirements. One of four team members that designed and developed Lockheed’s Integrated Coverage Analysis Program (ICAP) which provided broad program applicability and flexibility.

    Designed / implemented a simulation program for analysis and demo for deriving the ACRV manned re-entry spacecraft cross-range maneuver requirements and landing site options.

    Computers

    Computers:  ALPHA, PC WINDOWS, VAX Mainframe, CRAY, SUN, HP

    Languages/Applications:  FORTRAN 77 & 95,  VMS scripts, PC Windows scripts, C, WORD, EXCEL

    Education

    M.S., Aeronautical & Astronautical Engineering, University of Illinois, Urbana-Champaign, IL  1985

     B.A., Liberal Arts & Sciences Economics, University of Illinois, Urbana-Champaign, IL  1978

    Security Clearances

    DOD T.S. and SCI/Poly debriefed in 2011 at end of mission. DOD SECRET debriefed Aug 2012.


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