在分析体系工程过程模型及其不足的基础上，借鉴MBSE思想，把能力作为体系需求分析、设计和验证评估的不变量，以架构及架构原型作为勾连体系工程各项活动成果的抓手，提出一种体系工程过程环模型，并从时间、能力、架构3个角度对过程环模型进行了分析。
With the transformation from the traditional document-based systems engineering (DBSE) to the model-based systems engineering (MBSE), it becomes more and more difficult for the "Vee" process model of the DBSE to reflect the characteristics and the requirements of the system of systems (SoS) engineering. Based on the analysis of the SoS engineering (SoSE) process models and their shortcomings, this paper takes the capability as the invariant feature in the system requirement analysis, the design, the verification and the evaluation. The architecture with its prototype is selected as the connector of all activities of the SoSE. A ring model for the SoSE process is proposed and analyzed from the viewpoints of the time, the capability and the architecture. The results of this paper could be used for understanding the SoSE process, establishing the architecturecentric SoSE theory and guiding the SoSE practice.
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