修正的DSmT证据编码方法

Modified evidence coding method based on Dezert-Smarandache theory

计算量是影响Dezert-Smarandache理论(DSmT)应用的重要因素之一,也一直是DSmT的研究热点。计算编码由于其证据表示和信度计算的合理性,得到了广泛的认可。计算编码在编码转换时简单有效,但在解码转换时需要进行全部可能元素查找,需要大量查找计算,降低了计算编码的执行效率。文章提出了一种修正的DSmT证据编码方法,该方法将焦元关系转换为唯一的位置属性并事前存储于数据库中,减小了在解码过程中的查找计算量,修正方法在不改变合成结果的前提下更加有效。算例也验证了修正方法在合成结果上的正确性和计算量上的高效性。

The calculation is one of the important issues which affect the application of the Dezert-Smaran- dache theory （DSmT）. The research of the calculation is a hotspot in the area of the DSmT. The calculation code is widely recognized for the reasonability of evidence expression and belief computation. The calculation code is simple and effective in the coding process. But all possible elements should be searched in the decoding process which causes large calculation amount to reduce the efficiency of calculation code. To solve the problem, a modified evidence coding method is presented. In the modified method, the exclusive position attribution based on the focal element relationship is added to reduce the large calculation amount in the decoding process. The exclusive position attribution is generated and stored in the database before evidence processing. The simulation example verifies the validity of the combination result and the high efficiency in the calculation.