Modularity concepts of the Multi-Path Redundant Avionics Suite (MPRAS)

The use of modularity within the Multipath Redundant Avionics Suite project is discussed. Modularity is considered at several levels, including systems, subsystems, electronic circuit assemblies and even functionality within circuit assemblies. MPRAS maintains the modularity of PAVE PILLAR and extends it to include modules designed to provide efficient input/output functions and to support implementation of multistring redundancy. A method of configuring multiple sets of avionics modules (clusters) into a fault-tolerant redundant subsystem has been developed. These subsystems are intended to be incorporated into the overall system in a modular fashion to support vehicles such as the advanced launch system, which are themselves designed as modular vehicle families. The software operating system is also modular, based on the Ada high order language, and can be configured for specific vehicle functions. Deterministic system software operation and high levels of avionics testability provide an environment intended to keep system operations costs as low as possible. The result is an avionics architecture which can be used in a wide variety of applications, from the simplest launch vehicles to complex systems envisioned for future space exploration