基于全局冲突系数的证据权重确定及合成研究

Determination of Evidence Weight Coefficient and D-S Combination Research Based on Global Conflict Coefficient

为对证据源进行合理修正,解决高冲突证据合成时存在的问题,提出了一种新的证据权重确定方法。首先利用证据之间的局部冲突和相似性求出各个证据的全局冲突系数;其次取全局冲突系数的反值作为证据的权重并利用该权重对原证据的概率进行重新分配;最后对修正后的证据进行合成。算例比较结果表明,该方法与其他方法相比有较强的优越性。

To modify the evidence source reasonably and deal with the problem arising in using D-S combination rule for the combination of highly conflicting evidences,this paper proposes a new evidence weight determination method.Firstly,a global conflict coefficient of the evidence is calculated by local conflict and similarity between evidence.Secondly,the inverse value of the global conflict coefficient is taken as the evidence weight and the weight is used to reallocate the probability of the original evidence.Finally,the modified evidence is combined.The results show that the method is superior to other methods.