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针对D-S证据理论在合成高度冲突证据时会得到有悖常理的无效结果的问题,提出了有效解决冲突须同时修正证据源和合成规则的原则,并给出了证据合成的一般框架;在此框架下,提出了一种新的证据合成方法。该方法首先对证据源进行两级可靠性度量处理,然后再按照合成规则进行合成,最后采用基于Pignistic概率距离计算的权重把冲突系数分配给各焦元,实现对合成结果的合理修正。实验结果表明:该方法能有效地解决高度冲突证据的合成问题,与其他合成方法相比,该方法合成效果更好。
Aiming at the problem that DS evidence theory can get invalid results when it is used to synthesize highly conflicting evidences, the principle that evidence sources and synthesis rules need to be corrected effectively is proposed. The general framework of evidence synthesis is given. In this framework Under the proposed a new method of evidence synthesis. In this method, two-level reliability measures of evidence sources are first processed and then synthesized according to the synthesis rules. Finally, the weight of the Pignistic probability distance calculation is used to allocate the conflict coefficients to each focal element so as to achieve reasonable correction of the synthesis results. The experimental results show that the proposed method can effectively solve the problem of highly conflicting evidence synthesis. Compared with other synthetic methods, this method is more effective.