## 3 R-SIN Architecture Model Based on DaaC
### Realization Mechanism
#### 3.2.2 Description Mechanism  
In order to put forward the reconfigurable modeling method of task-oriented architecture for the SIN based on DaaC (R-SIN) into practice, it is necessary to rely on the specific guidance framework in order to carry out the concrete realization. The DoDAF framework is a normalized method that describes the architecture, and it is a guide to the design and development of the architecture [25]. The activity-based and service-oriented architecture modeling approaches mentioned in Section 2.2 are implemented based on the DoDAF. In the military field, the DoDAF is an effective means for the architecture description and modeling of objects such as SES and SIS. Of course, in our early work, the specific practice of the SIN architecture based on DaaC is completed based on DoDAF2.0. Therefore, the reconfigurable modeling method of task-oriented architecture for the SIN based on DaaC is also based on the DoDAF2.0 to implement.  
The DoDAF2.0 is an upgrade and perfection based on the DoDAF1.0 and DoDAF1.5. In comparison, in the DoDAF2.0, more attention is paid to the importance of data throughout the life cycle of a network system. In the DoDAF 2.0, the idea of the product is weakened, and has gradually highlighted the importance of \"data\". It coincides with the DaaC modeling idea of this article. What is most important is that the relevant scholars have successfully applied the DoDAF2.0 to other objects, including space-based information systems and space information systems. All of this provides the possibility and feasibility for this paper to realize the description and modeling of the reconfigurable modeling method of task-oriented architecture for the SIN based on DaaC with the DoDAF2.0. Moreover, up until now, the U.S. military has developed the fifth version of the DoDAF architecture framework, and formed a set of more scientific and standardized architecture design methods. In particular, in 2009, the official release of the DoDAF2.0 edition also became the most widely used architecture design guide in the current period. To sum up, the DoDAF2.0 is an effective choice to realize the reconfigurable modeling method of task-oriented architecture for the SIN based on DaaC in this paper.  
Admittedly, although the DoDAF2.0 is consistent with the idea of DaaC modeling, the feasibility needs to be refined if they are to be directly applied to the reconfigurable modeling method of task-oriented architecture for the SIN based on DaaC. The DoDAF2.0 is primarily a view-based representation of the architecture, and it is organized around data, models, and views [33]. Therefore, there are eight types view models, which are defined in the DoDAF2.0 as follows.  
As shown in Figure 6, the above views need to be selected in conjunction with specific task requirements in the design of specific architectures. Not all of them need to be covered, and different views can be specifically divided into multiple sub-perspectives, thus achieving a comprehensive description of the architecture.  
Figure 6: Architecture views in the Department of Defense Architectural Framework 2.0 (DoDAF2.0).  
In fact, the DoDAF2.0 is a description process in the early stage of architecture modeling. In the later period, in order to display the concrete embodiment structure of the R-SIN in a formal way, it is necessary to simulate based on a simulation platform, such as the Satellite Tool Kit (STK).