离散系统参数估计的极大似然法及在飞行数据处理中的应用

Discrete-Time Maximum Likelihood Method for Parameter Estimation and Its Application to Flight Data Processing

本文提出了一种有效的离散系统参数估计的极大似然方法，并书其成功地应用于飞行数据处理中．为了保证飞行状态测量偏差估计的精度，本文提出了飞机运动准确离散化模型，利用积分求和法使系统噪声大大减少；并利用分级估计法大大提高了计算效率．数字仿真和对我国几种类型飞机的飞行数据实际计算表明，这一方法能够准确地估计出飞行状态和仪器误差，对不同的初值和噪声统计特性均能得到一致的结果．

It is well known that,when a priori values aDd noise statistics are hot given, maximum likelihoodmethods are not sufficiently effective in estimating the frequently CDcountercd big errors of measurementsof night state. To improve such effectiveness,this paper presentS an emcient discrete-time maximum likelihood method for parameter estimation. Compared with the maximum lilieliliood method used by manynight test groups,the author,s method appears to be better in the following respects:(l)High accuracy in est...