应用遗传算法的频域最大似然参数辨识  

Identification of Frequency Domain Maximum Likelihood System Using Genetic Algorithm

作　　者：段世忠[1] 周荫清[1] 

机构地区：[1]北京航空航天大学电子工程系

出　　处：《北京航空航天大学学报》2001年第5期532-535,共4页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：针对基于变量误差模型EV模型 (Errors in VariablesModel)的传递函数频域最大似然参数估计中存在的初始值以及收敛问题提出了使用浮点遗传算法的改进算法 .仿真试验表明 ,单独使用遗传算法难以得到系统传函的精确估计 ,传统的非线性数值递推算法在一些情况下容易收敛到局域最小值 .将两种算法结合使用 ,可以有效地克服各自的不足 .新算法可以给出系统延迟的初始值的估计 .当代价函数存在多个局部最小值时 ,它仍然能够快速准确地寻找到全局最优点 .Float point genetic algorithms were used to solve the start value and convergence problems of frequency domain maximum likelihood system identification, based on errors-in-variables model. Simulations showed that it is difficult to get accurate result only using the genetic algorithm, while the traditional non-linear iterative optimization methods may lead to convergence to local minimum in some cases. By taking the advantages and overcoming the defects of the above two methods, an improved algorithm was proposed which can give the start value of delay directly and can find the global minimum precisely within a rather short time, even when cost function has a lot of local minima. In addition, the improved algorithm exhibited broader adaptability than the old ones.

关 键 词：系统辩识 最大似然参数估计 线性系统 应用遗传算法 计算机数字仿真频域 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] O231.3[自动化与计算机技术—计算机科学与技术]