Abstract:

Due to the problem of hardness to define the assessing target in damage assessment of information system, a damage assessment model based on ability reduced order is proposed, in which information ability is degraded into level of sub-tasks ability, level of information services and level of service components. Firstly, the damage transitive relation between different level, including logical relation, linear relation, exponential attenuation relation and threshold discrimination relation is analyzed. Based on the interpretative structural model, the transitive relation matrix is constructed, which can be used to analyze the cascade transitive relation of damage in same level, and the structure of damage assessment tree and assessment computation steps are defined. Finally, taking the air defence and antimissile C2 information system as the example, validity of the model is analyzed and verified.