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基于贴近度的D-S证据合成改进方法

         

摘要

One novel conflict evidence combination method was studied. The reliability of the evidence were different, the direct use of conventional synthetic methods may be inconsistent with the actual results. In the new method, the degree of correlation between evidence was determined by the value of closeness degree* which also showed the level of conflict, and the value of closeness degree was further changed into weight which reflects the importance of evidence. According to weight, the basic probabilities were reallocated, and the degree of conflict was decreased, the final combination results can obtain get by improving the synthesis formula. Examples verify that the new method can objectively reflect the importance of evidence and get correct combination result with evidences of normal and conflict situations, and shows good adaptability, reliability and high convergent speed compared to the other methods.%提出了一种新的冲突证据合成方法;信息融合中证据源的可靠性可能不同,直接利用传统的合成方法可能得到与实际相悖的结果;新方法通过贴近度表示证据间相关程度,证据贴近度的值可以判断证据的冲突程度,进一步通过相关算法转化贴近度为反映证据重要程度的证据权值,根据权值对原始的基本概率赋值函数进行重新分配,降低冲突证据的重要性,再通过改进的合成公式,对重新概率分配的证据进行合成,得到合成结果;仿真实验表明,新方法能客观反映证据重要程度,在正常与冲突证据情况下都能很好地得到合成结果,与其它方法相比,具有更好的适用性、可靠性和较快的收敛速度.

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