ITT Exelis has selected the LynuxWorks LynxOS-SE real-time operating system (RTOS) for its new line of software-defined radios (SDR) that includes Soldier Radio, Rifleman Radio and SideHat variants for the U.S. and International SDR markets.SDR must be certified by the Joint Tactical Radio System (JTRS) Joint Program Executive Office to be compliant with its standards for Software Communications Architecture (SCA) 2.2.2. and Application Programming Interfaces (APIs). ITT Exelis Operating Environment (OE) was certified with no waivers, obtaining the highest degree of compliance. According to vvRobert Day, VP of Marketing for LynuxWorks, an important part of such SDR applications is Virtual Machine (VM) brick-wall partitions, which make it impossible for system events in one partition to interfere with events in another. In the LynxOS, he said, each partition runs as a virtual machine with dedicated resources. Memory and resources are never shared between the partitions in a LynxOS-SE system, and an ARINC 653-based fixed-cyclic scheduling algorithm ensures that the system is deterministic and safe by providing each partition with fixed cycles of execution time.The time- and space-partitioned, hard real-time operating system has the ability to run POSIX and ARINC 653 applications simultaneously in a single partition. It offers additional security features over traditional RTOS solutions, such as discretionary access control, roles, privileges, auditing, identification and authentication, quotas and trusted paths.LynxOS-SE is available on Intel x86, Intel Atom, PowerPC and ARM architectures.