一种新的证据权重系数确定方法

分析现有的证据权重确定方式存在的缺陷,在此基础上提出了一种新的改进算法。利用各证据与平均证据的相似系数求出证据的初始权重；把权重低于阈值的证据从证据组中剔除,计算剩余证据的权重,经K次迭代,直到所有证据的权重都大于阈值；最后将K次权重算术平均得到各证据的最新权重系数,对证据加权平均后再利用D-S组合规则进行组合。通过算例比较表明该方法的合成结果更加有效。

New Method of Determining Evidences Weight Coefficient

We analyzed the defects of the existing way to determine the weight of evidence,and gave a new modified method based on the present method.It calculated the evidence primary weight via similarity between evidence and ave-rage evidence.When the weight value is less than the threshold value,the evidence is removed from evidence group,and the weight of remaining evidence is calculated.By K iterations,until all the evidence weight is higher than the threshold value,arithmetic average value of K evidence weights is calculated.Finally,D-S combination rules is used to combine the weighted average evidence.An example indicates that the new method can give the more reasonable combination results compared with D-S combination rule and other modified methods.