Model-Based GN and C Simulation and Flight Software Development for Orion Missions beyond LEO

For Orion missions beyond low Earth orbit (LEO),
the Guidance, Navigation, and Control (GN&C) system is
being developed using a model-based approach for simulation
and flight software. Lessons learned from the development of
GN&C algorithms and flight software for the Orion
Exploration Flight Test One (EFT-1) vehicle have been applied
to the development of further capabilities for Orion GN&C
beyond EFT-1. Continuing the use of a Model-Based
Development (MBD) approach with the Matlab®/Simulink®
tool suite, the process for GN&C development and analysis has
been largely improved. Furthermore, a model-based
simulation environment in Simulink, rather than an external
C-based simulation, greatly eases the process for development
of flight algorithms. The benefits seen by employing lessons
learned from EFT-1 are described, as well as the approach for
implementing additional MBD techniques. Also detailed are
the key enablers for improvements to the MBD process,
including enhanced configuration management techniques for
model-based software systems, automated code and artifact
generation, and automated testing and integration.