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Ancil Marshall

Ancil Marshall

Senior Guidance Navigation and Controls Engineer

Guidance Navigation and Controls
Aircraft, Spacecraft, Orbital Dynamics
Modeling and Simulation
48 years old
Boston (02108) United States (Massachusetts)
Employed Open to opportunities
Senior Guidance, Navigation and Controls (GNC) Engineer with over fifteen years of experience specializing in aircraft, missiles, launch vehicles, space vehicles and commercial drones. Expert in a wide-range of GNC responsibilities such as the modeling of aerospace vehicles, the design and analysis of feedback control laws, the development of guidance algorithms, the analysis of mission performance via simulations, the support of vehicle integration tests and on-site, in-field flight activities.

Strong project management skills demonstrated by leading various programs and heading up small multi-disciplinary teams for diverse projects. Firmly believes in team development through collaboration, training and mentoring.

Open to new opportunities in a GNC flight controls group where I can leverage my experience to ensure the success of challenging projects.
  • GNC Engineer on GQM-163A missile. Managed linear analysis tools, conducted nonlinear 6DOF simulations in C++, performed vehicle integration tests, investigated flight anomalies and recommended software fixes.
  • Lead GNC Engineer for High Diver variant of GQM-163A. Performed GNC design from the initial concept to the eventual launch.
  • Lead GNC Engineer on FFMS variant of GQM-163A and traveled to Ile du Levant, France with multi-disciplinary team to perform launch operations.
  • Parameterized GQM's time-scheduled flight gains to a Mach and mass-based adaptive algorithm.
  • Developed various guidance algorithms for the High Diver variant of GQM to improve its performance and robustness.
  • Created Simulink model of the High Diver gas generator, which successfully matched motor tests.
  • Worked with aerodynamics group to simplify a 5D High Diver model into a 2D model in order to embed the reduced model in flight software.
  • Performed independent reviews of the Minotaur I, Pegasus and Antares space launch vehicles, the Orbital Boost Vehicle, and the Patriot Target Vehicle.
  • Lead GNC Engineer for the Zombie Pathfinder program, a single-stage and a two-stage ballistic missile for NASA's Sounding Rocket Program. Performed initial design trade studies, improved 6DOF nonlinear simulations.
  • Mentored other engineers in GNC and C/C++ 6DOF simulation. Taught GNC course to a group of forty engineers.