The results of studies into digital system architectures, applicable to next-generation avionics systems, are presented in this report. Representative requirements are developed for a lightweight fighter and a close air support system, both assumed to be operational in late 1978; and a long range strategic bomber of the 1980's. Alternative digital system architectures are defined and comparative data among these architectures presented. A life cycle cost methodology, used in developing the comparative data, is also discussed. Alternate approaches to software modularity, and verification and validation are developed and comparative data among these approaches presented. An assessment of the technology required to support the digital system architectures, and the time-frame compatibility between the availability of this technology and the digital architectures is also addressed. (Author)


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