Conflict Evidence Combination Method Based on AHP and TOPSIS

Aiming to the problem that the traditional Dempster-Shafer(D-S) evidence theory may produce contradiction with intuition when synthesizing evidence with large conflict. A new combination method of conflict evidence based on AHP and TOPSIS is proposed. Firstly, based on the idea of AHP, the decision maker determines the judgment matrix according to the relative importance of each evidence by combining subjective experience, and the weight vector of each evidence is obtained by using AHP. Secondly, the comprehensive evaluation index, i.e. comprehensive weight is obtained by combining the subjective weight and TOPSIS. Finally, the original data is weighted and modified by using the comprehensive weight and fused by using Dempster's combination rule. The experiment results show that the proposed method can effectively solve the fusion problem of high conflict evidence, and the accuracy of identifying supporting evidence reaches 0.9928. Compared with the classic improved method, the proposed method is more reasonable and has higher accuracy.