Samuel H. Dupree, Jr.

Astrodynamics Engineer

Updated Oct 05, 2023

CONTACT INFORMATION

***** ****** ***** ****

Apartment 201

Fredericksburg, VA 22407-8200

Tel.: Home: 540-***-**** Mobile: 215-***-**** (preferred)

E-mail: ad0a6n@r.postjobfree.com

LinkedIn Profile: https://www.linkedin.com/in/sam-dupree-8b923b9

EXPERIENCE SUMMARY

Samuel Dupree brings 30+ years of experience in applying orbital mechanics, orbit propagation and orbit determination in both the systems and software engineering roles supporting IC and DoD ground systems programs.

Experienced in: requirements analysis, definition, decomposition, and allocation; algorithm development; experienced with batch and filter/smoother orbit determination softwares/algorithms in particular the use of GPS observations in orbit determination; test support and documentation.

Experienced in FORTRAN-66, Fortran-77 and Fortran-95 on various platforms (on an IBM System 390 under MVS, IBM RISC System 6000 under AIX (IBM’s version of UNIX) and Apple Macintosh under Mac OS X (BSD 4.3 version of UNIX), as well as various scientific and mathematical software libraries such as International Mathematics and Statistics Library (IMSL), the IAU Standards Of Fundamental Astronomy (SOFA) Software, and the SPICE Kernels from the Jet Propulsion Laboratory (JPL).

Familiar with Jupyter Notebooks, Python and MATLAB.

Familiar with Microsoft Word and PowerPoint.

Familiar with STK, STK/Astrogator, and ODTK. Level-1 Certified in both STK and ODTK.

Aware of the Astrodynamics Standards Workbench (ASW) having been at Dahlgren and through the National Academy’s Report, “Continuing Kepler’s Quest: Assessing Air Force Space Command’s Astrodynamics Standards (2009).”

Granted Top Secret/SCI Clearance on January 15, 2018. Currently under reinvestigation and enrolled in the Continuous Evaluation Program (CEP).

Previously held CI/Poly and more than willing to take one again.

EDUCATION / SPECIALIZED TRAINING / CERTIFICATIONS

EDUCATION

June 1974 The Pennsylvania State University, University Park, PA

Bachelors of Science Degree with Distinction in Astronomy

May 1978 The Pennsylvania State University, University Park, PA

Masters of Science Degree in Astronomy

SPECIALIZED TRAINING

Jun 2021, edX, DelftX, Observation Theory: Estimating the Unknown

Apr 2021, AIAA, Short Course on Fundamentals of Classical Astrodynamics and Applications

May 2017, edX, HarvardX, PH526x: Using Python for Research

Oct 2016, coursera, U of Cape Town, Julia Scientific Programming

Apr 2016, edX, EPFLx, EE585x: Space Mission Design and Operations

Nov 2015, coursera, Rutgers University, Analyzing the Universe

Sep 2015, coursera, U of Michigan, Programming for Everybody (Python)

Jun 2015, coursera, Vanderbilt U, Introduction to Programming with MATLAB

May 2015, edX, MITx, Into to Aerosp Eng Astronautics & Human Spaceflight

May 2015, edX, Australian National U, ANU-ASTRO4x: Cosmology

Jan 2015, edX, Australian National U, ANU-ASTRO3x: The Violent Universe

Jun 2014, edX, Australian National U, Greatest Unsolved Mysteries of the Universe

Jun 2014, edX, University of Texas Sys, 5.01x: Linear Algebra - Foundations to Frontiers

Jan 1993, Completed Engineering Process Improvement (EPI) Phase II Certification, General Electric Co., Management and Data Systems

Jun 1990, Completed Project Leadership Course-I (PLC-I), GE Crotonville

Apr 1990, Completed SHARE Management Training

Nov 1986, Attended Workshop on Scientific Software for Supercomputing, sponsored by Society for Industrial and Applied Mathematics (SIAM), and National Bureau of Standards (NBS)

CERTIFICATIONS

May 2018, CompTIA, Security+ Certification

June 2018, Analytical Graphics Inc., System Tool Kit (STK) Level 1 Certification

May 2021, Analytical Graphics Inc., Orbit Determination Tool Kit (ODTK) Level 1 Certification

CHRONOLOGICAL WORK EXPERIENCE

Oct 2020 – Aug 2023

Northrop Grumman / Sterling, VA

Staff System Engineer

Performed Flight Dynamics activities for Orbiting Carbon Observatory-2 (OCO-2) (May 2021 to July 2023)

oPerformed daily orbit determination for the delivery of ephemeris products

oGenerated maneuver plans for drag make-up, inclination adjust, and conjunction mitigation (risk mitigation) maneuvers

oGenerated weekly status briefings using Microsoft Office Suite

oAttained ODTK Level-1 Certification

oUtilized STK, STK/Astrogator, ODTK, various Python and MATLAB scripts

oPerformed and completed ad hoc tasks:

Developed and documented aid for designing risk mitigation maneuvers

Supported atmosphere density model trade study for ODTK transition from ver. 6 to ver. 7

Supported Mission Planning Scrum Team - Raptor (Oct 2020 to April 2021)

oWrote code in Python

oPerformed assessment of coordinate frame usage within the CSCI and with associated CSCIs

oProvided algorithm development/support in the areas of orbital mechanics

oExposed to Agile Development

Willingly shares knowledge and experience with colleagues

Sep 2010 – Jan 2020

L3 Harris Corporation / Dahlgren, VA

Astrodynamics Engineer

Performed algorithm development and support in the areas of orbital mechanics and orbit estimation

Utilized prior experiences in systems engineering and software engineering in support of requirements analysis and definition

Utilized prior experiences in software engineering in support of software design, code, debug, and test

Software written in Fortran-77 / Fortran-90/95

Attained STK Level-1 Certification

Willingly shares knowledge and experience with colleagues

Sep 2004 – Jun 2010

Abington Friends School / Jenkintown, PA

Visiting Astronomer, Project ASTRO NOVA

Assisted in teaching astronomy to 5th-grade science class

Assisted teacher with classroom activities and materials

Assisted students with various astronomy projects, e.g., Science Night and Space Day

Jan 2005 – Sep 2009

Lockheed Martin Information Systems and Global Services / King of Prussia, PA

Systems Engineer Staff

Supported EDS (Engineering Development and Sustainment) 2006 as Orbital Mechanics Subject Matter Expert (SME)

Provided Systems Engineering support as related to requirements definition in preparation and development of:

oMulti-Mission Space Operations Center (MMSOC) Ground System Architecture (GSA) System Spec

oMMSOC GSA Evaluation Subsystem Spec

oMMSOC GSA Preliminary Design Review (PDR) materials

oMMSOC GSA Critical Design Review (CDR) materials

oSTPSat2 Design Review phase of EDS 2006

Performed role of Integrated Product Team (IPT) Lead for Control Segment Navigation Mission Subsystem on OCX (GPS III) Proposal

Continued providing ephemeris Systems Engineering support to Integrated Development and Maintenance Organization (IDMO) management and personnel in the area of requirements definition and verification

Continued supporting requirement assessment and costing information to cognizant IDMO management

Continued responsibility for the design, implementation, and maintenance of major pieces of ephemeris and ephemeris-related software

Continued providing technical support in the resolution of Discrepancy Reports (DRs)

Continued providing ephemeris engineering support to IDMO personnel

Jan 1999 – Dec 2004

Lockheed Martin Integrated Systems and Solutions / King of Prussia, PA

Commercial Applications Software Engineer Staff

Performed role of Integrated Product Team (IPT) Lead for Control Segment Navigation Mission Subsystem on OCX (GPS III) Proposal

Continued providing ephemeris Systems Engineering support to Integrated Development and Maintenance Organization (IDMO) management and personnel in the area of requirements definition and verification

Continued supporting requirement assessment and costing information to cognizant IDMO management

Continued responsibility for the design, implementation, and maintenance of major pieces of ephemeris and ephemeris-related software

Continued providing technical support in the resolution of Discrepancy Reports (DRs)

Continued providing ephemeris engineering support to IDMO personnel

Jan 1998 – Dec 1998

Lockheed Martin Management and Data Systems / King of Prussia, PA

Staff Applications Software Engineer

Continued providing ephemeris Systems Engineering support to IDMO management and personnel in the area of requirements definition and verification

Continued supporting requirement assessment and costing information to cognizant IDMO management

Continued to be responsible for the design, implementation, and maintenance of major pieces of ephemeris and ephemeris-related software

Continued providing technical support in the resolution of Discrepancy Reports (DRs)

Continued providing ephemeris engineering support to test support personnel

Jan 1994 – Dec 1997

Lockheed Martin Management and Data Systems / King of Prussia, PA

Staff Scientific Programmer/Analyst

Continued providing ephemeris Systems Engineering support to IDMO management and personnel in the area of requirements definition and verification

Continued supporting requirement assessment and costing information to cognizant IDMO management

Continued to be responsible for the design, implementation, and maintenance of major pieces of ephemeris and ephemeris-related software

Continued providing technical support in the resolution of Discrepancy Reports (DRs)

Trained new personnel in the methodology and software tools used on Program 96B

Continued providing technical support to Systems Engineering and test support personnel in the area of requirements definition and verification

Continued providing technical assistance in ephemeris and ephemeris-related issues to Programs 425 and 470 personnel in support of requirement analysis

Software implemented under the Fortran-66 and Fortran-77 Language Standards

Jan 1988 – Dec 1993

Martin Marietta Management and Data Systems / King of Prussia, PA

Senior Software Design Engineer

Responsible for systems engineering activities in support of development of near real-time user orbit determination software (Program RPC)

Actively participated in joint Development (Systems and Software Engineering) and Systems Integration (SI) accuracy studies, requirement analysis and allocation

Actively participated in the design, code and debug, and test of the software

Continued providing technical support in the resolution of Discrepancy Reports (DRs)

Continued supporting requirement assessment and costing information to cognizant unit management

Continued to be responsible for the design, implementation, and maintenance of major pieces of ephemeris and ephemeris-related software

Continued providing technical support to Systems Engineering and test support personnel in the area of requirements definition and verification

Provided technical assistance and direction to peers and subordinates in the design, implementation, and testing of GPS user receiver quality assurance monitoring logic in user orbit determination software

Provided technical expertise in the area of ephemeris and ephemeris-related software to Systems Engineering in support of the generation of essential and implementation models and the conduct of critical method studies during OF Rearchitecture (Program 470) Definition Phase

Provided technical input and support to OF Rearchitecture C-Language Pilot Study

Provided technical assistance in the area of ephemeris and ephemeris-related issues to Programs 425 and 470 personnel in support of requirement analysis

Provided technical assistance to Systems Engineering in support of an engineering study leading to the development of an operations concept for potential ephemeris work

Software implemented under the Fortran-66 and Fortran-77 Language Standards

Jun 1981 – Dec 1987

General Electric Co., Military and Data Systems Operations / King of Prussia, PA

Senior Programmer/Analyst

Responsible for design, code and debug of several software modules belonging to the Ephemeris Management CPCI (Computer Program Configuration Item)

Supported test personnel during both Segment Level Test (SLT) and IC&T (Integration, Checkout and Test)

Prepared documentation for delivery

Directed several junior personnel in performing the above tasks

Trained new personnel in the methodology and software tools used by the Ephemeris Management CPCI

Assisted Systems Engineering in the initialization and validation of the ephemeris database in preparation for Segment Level Test

Provided requirement assessment and costing information to cognizant unit management

Provided ephemeris software expertise to Systems Engineering in the preparation of RFCs (Requests for Change)

Provided ephemeris software expertise to Systems Engineering in support of Technical Exchange Meetings (TEMs)

Performed technical investigations leading to the resolution of Discrepancy Reports (DRs)

Performed technical investigation to improve the wall clock run-time of an orbit determination software package consisting of a sequential forward filter and a backward smoother:

oThe software package consisted of 400 subroutines

oThe investigation led to a 40% decrease in the program’s wall clock run time

oThis investigation and run time improvement led to my receiving the Software Development Achievement Award, as well as receiving the Ground Systems Department’s General Manager’s Award

Successfully completed development of Performance Evaluation (GPE) software

Supported test personnel during Stand Alone Test (SAT) and Segment Level Test (SLT)

Began new assignment with the Ephemeris Management CPCI (Computer Program Configuration Item) in January 1983

Responsible for the implementation and modification of ephemeris software to accommodate GPS Selective Availability and Anti-Spoofing; software modified included:

oGPS ephemeris data management software

oUser orbit determination software using GPS observations

Supported the development effort through the Definition Phase

Provided support to both Preliminary Design Review (PDR) and Critical Design (CDR) Review

Responsible for the preparation of supporting documentation

Provided support to test personnel during Stand Alone Test (SAT) Phase of development

Responsible for the design, code and debug of scheduling software for the Performance Evaluation (GPE) CPCI

Responsible for developing scheduling software prototype

oUsed to flush out issues supporting critical design

oUsed to support Systems Engineering algorithm validation effort

oUsed prototype to provide kernels for code and debug phase

Presented detailed design to customer at Critical Design Review (CDR)

Responsible for software documentation

Software implemented under the Fortran-66 Language Standards

Sep 1978 – May 1981

Rose-Hulman Institute of Technology / Terre Haute, IN

Instructor in Computer Science and Physics

Taught introductory programming course to the freshmen class

Taught sophomore physics classes in sound and light phenomena

Taught a variety of sophomore physics laboratory courses

Implemented computer graphics software system:

oSoftware primarily supported 2-D graphics and basic line drawing with capabilities for translating, rotating, and scaling an image

oDeveloped extensions for 3-D graphics

oDeveloped a set of stand-alone graphics software for both 2-D data plotting and 3-D hidden line removal

Sep 1975 - Aug 1978

Computation Center, The Pennsylvania State University, University Park, PA

Graduate Assistant

Provide programming consultation to the university faculty

Taught and assisted with various short courses sponsored by the Center

Major projects included the installation of the Graphics Compatibility System (GCS) from the U.S. Army Waterways Center

Active participant in the development of several in-house computer graphics software packages

Professional Activities

2004-2010 Visiting Astronomer, Project ASTRO NOVA

Provided assistance in teaching astronomy to 5th grade science class

Assisted teacher with classroom activities and materials

Provided assistance to students with various astronomy projects, e.g. Science Night and Space Day

1993-1997, Project Manager, Numerically Intensive Computing (NIC) Project, SHARE

Jan 1993, Completed Engineering Process Improvement (EPI) Phase II Certification, General Electric Co., Management and Data Systems

1993-1997, Deputy Project Manager, Numerically Intensive Computing (NIC) Project, SHARE

June 1990, Completed Project Leadership Course-I (PLC-I), GE Crotonville

April 1990, Completed SHARE Management Training

Nov 1986, Attended Workshop on Scientific Software for Supercomputing, sponsored by Society for Industrial and Applied Mathematics (SIAM), and National Bureau of Standards (NBS)

Professional Memberships

Full Member, American Astronomical Society

oMember, Division on Dynamical Astronomy

oMember, Division on Planetary Science

oMember, Division on High Energy Astronomy

Technical Member, Astronomical Society of the Pacific

Member, Society for Industrial and Applied Mathematics

oMember, Special Activity Group on Supercomputing

oMember, Special Activity Group on Computational Science and Engineering

Senior Member, American Institute for Aeronautics and Astronautics

Member, American Astronautical Society

Member, IEEE Computer Society

Member, Association for Computing Machinery

oSpecial Interest Group on Computer Graphics and Interactive Techniques

oSpecial Interest Group on Languages, Fortran Forum

Honors and Awards

2008, Lockheed Martin M&CSS SPOT Awards

2008, Director, Responsive Satellite Command and Control Division, Space Development and Test Wing’s Quarterly Team Award

2006, Lockheed Martin IS&GS, SRA Team Accomplishment Award

2002, Lockheed Martin Management and Data Systems’ Prestige Award

2001, Letter of Appreciation from Secretary of Education, Commonwealth of Pennsylvania for participating in the development of the Commonwealth’s Academic Standards for Science and Technology

1999, Lockheed Martin Management and Data Systems’ Mission Success Award

1991, Best Session Award for Session I518, “The Flight of Voyager II – The Computing Behind the Pictures” at SHARE-75, August 1990

1990, General Electric Co., Management and Data Systems’ Professional Recognition for Individual Dedication and Excellence (PRIDE), Software Development Achievement Award

1989, General Electric Co., Ground Systems General Manager’s Award

1987, General Electric Co., Management and Data Systems’ Professional Recognition for Individual Dedication and Excellence (PRIDE), Software Development Achievement Award

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