Abstract: Considering that the combination of Dempster rule in Dempster-Shafer Theory (DST) has disadvantages while dealing with highly conflict evidences, a new two-level combination method for fusing conflict evidences was proposed. Distinguishing between highly conflict evidence and lowly conflict evidence, the method adopted the PCR6 rule based on Dezert-Smarandache Theory (DSmT) on the first level of combination to solve high conflict and used Dempster rule to keep fast convergence speed and good calculation capability on the second level, which could manage conflict evidence with various degrees effectively and reasonably. The validity of the proposed method was demonstrated by calculation examples.

Key words: Dezert-Smarandache Theory (DSmT), Dempster-Shafer Theory (DST), conflict evidence, Dempster combination rule, PCR6 rule

摘要： 针对DS理论(DST)中Dempster组合规则在处理高冲突证据时的不足，提出一种解决冲突证据的两级组合方法。该方法将高冲突和低冲突区别对待，在第一级组合中采用基于DSm理论(DSmT)的PCR6规则，化解可能的高冲突证据;在第二级组合中采用Dempster规则，保证良好的收敛速度和计算性能,从而合理、有效地处理各种程度的冲突证据。通过算例分析验证了该方法的有效性。

关键词: DSm理论, DS理论, 证据冲突, Dempster组合规则, PCR6规则