基于D/S证据理论的辐射源威胁等级评判

Threat Level Evaluation of Emitter Based on D/S Evidence Theory

辐射源威胁等级评判是电子战专家系统重要组成之一,D/S证据理论具有多数据源不确定信息推理和融合特点,符合人类思维决策过程。根据辐射源威胁因素和判断准则建立辐射源威胁等级评判体系,研究将隶属度函数表述威胁程度的模型改为区间分布表述的基本可信度函数模型,给出基本可信度函数值的归一化计算方法,使之符合D/S证据理论可信度分布函数要求。最后,用实例对模型进行了验证,结果表明D/S证据理论是评估辐射源威胁等级的一种有效方法。

The threat level evaluation of an emitter is an important part of the electron war expert system. The D/S evidence theory has characteristics of uncertain information inference and integration of multiple data sources, which agree with the thought decision making of human. The threat level evaluation of emitter based on D/S evidence theory makes the electron war system have intelligence. In this paper, D/S evidence theory characteristics and the mathematic formulas are introduced. According to the threat factor of radiant source and the judge rules, the system of the threat level evaluation of emitter is constituted. The model of denoting threat level with subjection functions is changed into the basic reliability model of denoting threat level with space dis- tributing. The normalized calculating methods of the basic reliability functional values are given, which match require of reliability distributing function in D/S evidence theory. Finally, examples are quoted to validate the models; the results indicate that the D/S evidence theory is an effective method of evaluating radiant source threat level.