基于HMM双重模型的伽马能谱漂移模拟  

THE SIMULATION OF γ SPECTRUM-SHIFTING BASED ON HMM DUAL MODEL

作　　者：黄洪全[1] 方方[1] 龚迪琛[1] 丁卫撑[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610059

出　　处：《物探与化探》2010年第4期482-484,502,共4页Geophysical and Geochemical Exploration

基　　金：国家教育部博士点基金(20060616010)资助

摘　　要：结合放射性测量中的能谱统计特性及漂移特点,提出了采用hidden Markov models对能谱漂移进行模拟的双重模型方法。采用Gaussian mixture model对能谱的短时瞬态特性进行描述,转化为参数化模型;采用HMM状态转移对能谱测量中的能谱漂移条件进行模拟,实现Gaussian mixture model的参数调整。实例表明,该方法可以灵活地调整参数以满足能谱漂移模拟的多样性要求,是一种性能良好的参数化模拟方法。Based on statistical characteristics of energy spectrum and spectrum-shifting features in spectrometry,the authors applied the dual model of Hidden Markov Models to the simulation of spectrum-shifting.Transient characteristics of energy spectrum were described and then transformed into a parametric model by Gaussian Mixture Mode.The conditions of spectrum-shifting in the measurement of energy spectrum were simulated by state transition of Hidden Markov Models,and then the parameters of Gaussian mixture model were adjusted.Practical application shows that these parameters can be adjusted flexibly by this method to meet the various requirements in simulation of energy spectrum shifting,and hence this method is a parametric simulation method with good performance.

关 键 词：GAUSSIAN MIXTURE model Hidden MARKOV MODELS 能谱漂移模拟 放射性测量 

分 类 号：P631.6[天文地球—地质矿产勘探]