Latest Space News
Thu, 21 Nov 2019 16:01:29 +0000
The moon has formed the isolated backdrop for a new era of space exploration. As you read this, there are teams of exploration advocates around the world striving to reach its surface. This new age is one that is being led not by spacefaring superpowers seeking to fly flags and footprints but instead by numerous private companies. SpaceNews.com
Thu, 21 Nov 2019 15:50:49 +0000
Space hardware builders say they fully expect 3D printing to revolutionize manufacturing, but cautioned that the technology is sometimes promoted without a full understanding of its pros and cons.  SpaceNews.com
Thu, 21 Nov 2019 14:46:55 +0000
German propulsion startup Morpheus Space won a U.S. Air Force Small Business Innovation Research contract and a NASA Jet Propulsion Laboratory purchase order after participating in the Techstars Starburst Space Accelerator. SpaceNews.com
Thu, 21 Nov 2019 14:03:20 +0000
Over the course of three days, attendees of the Advanced Maui Optical and Space Surveillance Technologies, or AMOS, conference agreed on a number of issues regarding space situational awareness and space traffic management, even if they don’t know how to resolve all those problems. SpaceNews.com
Thu, 21 Nov 2019 13:51:08 +0000
The International Telecommunication Union on Nov. 20 said the world’s spectrum regulators had reached consensus on milestones for constellations of satellites outside of the geosynchronous arc to preserve their spectrum rights.  SpaceNews.com
Thu, 21 Nov 2019 12:07:19 +0000
The Indian government has offered new details about what happened during its first attempt to land on the moon in September. SpaceNews.com
Thu, 21 Nov 2019 10:42:35 +0000
British aerospace company QinetiQ will use a newly expanded factory to build heat transfer experiment infrastructure for the European Space Agency under a 9 million euro ($10 million) contract, the company announced Nov. 21.  SpaceNews.com
Thu, 21 Nov 2019 10:29:55 +0000
A consortium led by Italian space company D-Orbit plans to operate a synthetic aperture radar (SAR) satellite for infrastructure monitoring. SpaceNews.com
Thu, 21 Nov 2019 08:15:24 +0000
Capella Space won a U.S. Air Force contract to adapt its commercial synthetic aperture radar (SAR) for military applications. SpaceNews.com
Thu, 21 Nov 2019 01:39:46 +0000
The first prototype of SpaceX’s next-generation launch system was damaged Nov. 20 during a tanking test, a setback the company claimed would not serious affect their development plans. SpaceNews.com
Wed, 20 Nov 2019 22:53:59 +0000
Rep. Derek Kilmer said commercial geospatial data should be used to supplement imagery from classified sources. SpaceNews.com
Wed, 20 Nov 2019 20:59:57 +0000
NASA plans to issue a call for ideas for a lunar rover that could be used by future crewed missions to the moon and, like many other elements of the Artemis program, be developed in a partnership with industry. SpaceNews.com
Wed, 20 Nov 2019 18:41:36 +0000
As United Launch Alliance prepares for the maiden flight of its Vulcan Centaur rocket, the company no longer has a clear timeline for a major second-stage upgrade.  SpaceNews.com
Wed, 20 Nov 2019 16:52:45 +0000
Feng Yang, Spacety CEO and founder, talked with SpaceNews about his plans for small synthetic aperture radar satellites and the origins of the company at the Space Tech Expo Europe.   SpaceNews.com
Wed, 20 Nov 2019 16:00:47 +0000
China used signals sent from NASA’s Juno probe orbiting Jupiter to test the capabilities of ground stations vital to its deep space ambitions. SpaceNews.com
Wed, 20 Nov 2019 14:49:44 +0000
The European Space Agency is preparing to allocate a few million euros to ensure Vega doesn’t have any repeats of its July launch failure, an agency official said Nov. 20. SpaceNews.com
Wed, 20 Nov 2019 14:39:49 +0000
While the physics associated with getting into orbit have not changed, the people, methods and ways we access and enable space have evolved. Credit the fuel of federal policy changes and innovation environments as the real force multipliers. SpaceNews.com
Wed, 20 Nov 2019 14:02:27 +0000
SpaceX’s plan to slash the cost of space transportation is shaking up the small satellite propulsion market. SpaceNews.com
Wed, 20 Nov 2019 13:02:50 +0000
OHB hopes to have a small launcher capable of sending 200 kilograms to low Earth orbit conduct a first flight by the end of 2021. SpaceNews.com
Wed, 20 Nov 2019 12:12:33 +0000
Commercial spaceports say they need to become more proactive in dealing with public opposition to proposed launch sites through a combination of education and community involvement. SpaceNews.com
More space news...
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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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