The Joint Tactical Radio System (JTRS) program is a 3-step process to define, standardize, and implement a software defined radio architecture. Step 1 resulted in a baseline architecture definition. In Step 2 the architecture definition will bedeveloped and validated as the Software Communications Architecture (SCA) which will be the basis for future Department of Defense (DoD) software radios. The SCA is also expected to become the standard for Government and commercial software radios. Step 3 activities will result in procurement and integration of systems and waveforms that are compliant with the SCA and which satisfy individual DoD user requirements. During Step 3, the architecture will continue to evolve in response to new or changingwarfighter requirements and technology advancements.The JTRS is defined in terms of its hardware, software, networking, and security architecture. This paper addresses the Software Communications Architecture (SCA). The JTRS program overview and hardware architecture concept is described in a companionpaper to be presented at this conference.
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