Latest Space News
Wed, 23 May 2018 16:15:20 +0000
U.K. Air Chief Marshall Sir Stephen Hillier says the cost-effective technology with its short development cycles would enable the military to always take advantage of the latest technological developments, unlike the traditional slow-paced military satellite projects. SpaceNews.com
Wed, 23 May 2018 13:22:07 +0000
AGI, in partnership with a Canadian company, announced May 23 that it has established the first commercial radar system capable of tracking objects in geostationary orbit and beyond. SpaceNews.com
Wed, 23 May 2018 12:23:15 +0000
In the future, the U.S. Air Force will launch satellites of all different sizes for customers with varying degrees of risk tolerance. SpaceNews.com
Wed, 23 May 2018 11:18:11 +0000
As SpaceX launched another Falcon 9 with a previously-flown first stage May 22, both the company and its competitors are seeing a growing acceptance of reusable vehicles in the overall market. SpaceNews.com
Wed, 23 May 2018 00:18:15 +0000
The launch industry is facing a shakeout in the coming years that could result in the failure of the vast majority of companies developing new vehicles, industry executives warned at a conference. SpaceNews.com
Tue, 22 May 2018 22:32:57 +0000
SpaceX says it will not go after any of the $2 billion in rural broadband subsidies the U.S. Federal Communications Commission will begin doling out this summer under its Connect America Fund II program. SpaceNews.com
Tue, 22 May 2018 22:06:09 +0000
A SpaceX Falcon 9 still sporting soot from its last mission successfully launched May 22 with five Iridium Next satellites and two science satellites for NASA and the German Research Center for Geosciences. SpaceNews.com
Tue, 22 May 2018 18:09:05 +0000
From 2000 to 2017, the U.S. government contracted more than $26 billion in foreign military sales to the Republic of Korea, including advanced combat aircraft and missile defense systems. SpaceNews.com
Tue, 22 May 2018 17:12:54 +0000
Startups backed primarily by private venture capital have announced plans to launch dozens of small SAR satellites within a decade to take advantage of the miniaturization of electronics. SpaceNews.com
Tue, 22 May 2018 17:08:45 +0000
In January, ICEYE proved it could operate a synthetic aperture radar on a microsatellite. Now the company is preparing to launch a constellation. SpaceNews.com
Tue, 22 May 2018 00:18:43 +0000
The UN certified Iridium Communications to provide Global Maritime Distress Safety System (GMDSS) services, ending Inmarsat’s monopoly on the internationally required service for ships, Iridium said May 21. SpaceNews.com
Mon, 21 May 2018 18:42:48 +0000
The USSOCOM can now take advantage of commercial innovations by procuring satellite connectivity as a managed service SpaceNews.com
Mon, 21 May 2018 17:08:04 +0000
Israeli fleet operator Spacecom on May 21 announced a contract worth up to $55 million for satellite capacity on its upcoming Amos-17 satellite. SpaceNews.com
Mon, 21 May 2018 12:30:45 +0000
Parsons will be pursuing more Air Force and NASA work, especially in small satellite prototyping and engineering development. SpaceNews.com
Mon, 21 May 2018 12:04:36 +0000
An Orbital ATK Antares rocket successfully launched a Cygnus cargo spacecraft to the International Space Station May 21 on a mission that may be the swan song for the company as an independent entity. SpaceNews.com
Sun, 20 May 2018 19:53:04 +0000
The utility of space sensors has been studied for decades so the Pentagon has plenty of data to draw from. SpaceNews.com
Sun, 20 May 2018 16:45:56 +0000
Striking United Launch Alliance employees will return to work after voting May 19 to accept a revised contract, ending a two-week strike. SpaceNews.com
Fri, 18 May 2018 20:18:02 +0000
As NASA formally requests proposals for studies on the commercialization of low Earth orbit, another study presented at a congressional hearing May 17 concludes commercial space stations are unlikely to be financially viable in the mid-2020s. SpaceNews.com
Fri, 18 May 2018 14:48:14 +0000
Members of a NASA safety panel said May 17 they believed that a SpaceX approach for fueling its Falcon 9 rockets known as “load-and-go” could be used for future commercial crew missions. SpaceNews.com
Fri, 18 May 2018 03:02:18 +0000
As House appropriators approved a spending bill May 17 that partially restores funding for a NASA astrophysics mission slated for cancellation, the agency’s administrator said he was “90 percent” confident that the mission will continue. 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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