使用频域极大似然法辨识飞机等效系统参数

USING FREQUENCY DOMAIN LIKELIHOOD METHOD TO IDENTIFY PARAMETERS OF AIRCRAFT EQUIVALENT SYSTEM

在飞机飞行试验的数据处理过程中，采用频域方法是比较方便的。频域极大似然法则是一种有效的方法，它具有频域计算简单，同时估计又是渐进无偏和一致的优点。由于飞行试验数据是时域数据，使用这种方法需要使用ＦＦＴ的方法将实测的时域数据转换成频域数据后再进行辨识。在军用飞机等效系统参数辨识过程中，取得了很好的计算结果。

It is convenient to use frequency domain methods to deal with flight test data. The frequency domain maximum likelihood method is a very efficient method, the advantages of which are simple in computing, un biased and consistent. Since the flight test data are of time domain, it needs to be converted into frequency domain by FFT method. Then it can be used to identify the system. This method has got good results in identifying the parameters of military aircraft equivalent systems.