RTOS, Embedded Linux, Real-Time Operating System and DO-178B: LynuxWorks

U.S. Navy Open Architecture (OA) Operating Systems
Embedded operating systems for military software and hardware

The LynxOS® RTOS is the only POSIX®-conformant RTOS that is Linux ABI-compatible and it has been certified as Navy Open Architecture Computing Environment (OACE) Category 3 compliant.

An open-standards operating system such as the LynxOS RTOS must be used as the operating system in all new U.S. Navy systems, according to the Navy Open Architecture (OA)—to ensure future system interoperability and to support software reuse.

What is U.S. Navy Open Architecture ?

The Navy OA is a systems design approach supported by verifiable governmental testing platforms, such as the OACE, that seeks to implement open specifications for interfaces, services and supporting formats. It enables software components to work across a range of systems and interoperate with other software components on local and remote systems.

The Navy OA promotes interaction between designers, suppliers and end users that facilitates portability. Through OA, common standards and products are employed in the areas of frameworks, middleware, resource management and operating systems, utilizing established and evolving industry standards.

OACE is a compatible set of largely standards-based COTS computing infrastructure components (hardware and software) that provides the computational framework upon which tactical and support applications are built under the guidelines of OA. The scope of OACE includes technical architecture, standards and products.

Key Open Architecture principles include:

U.S. Navy Open Architecture documents

LynuxWorks operating systems prove themselves every day in numerous Navy Open Architecture programs:

Both the Navy OA initiative and the Weapons Systems Common Operating Environment (WSCOE), rely on the hard, real-time deterministic capabilities of the LynxOS real-time operating system to satisfy their rigorous system requirements.


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