Study of the Application of the Multiple-Channel Maximum Entropy Method

As a modern analysis method of frequency spectrum, due to a high resolution of frequency and phase from a short sequence of data, the Multiple-channel Maximum Entropy Method (MMEM) has been widely used in the field of signal processing. After mentioning a mathematic model of quasiuniform waves, this paper displays a method of deriving some important parameters of quasi-uniform waves by MMEM. As an example, in order to prove the effectiveness of the method, some experiments have been carried out with the data from the Digisonde 256 at Wuhan Ionospheric Observatory. In comparison with the Basic Period Diagram method, MMEM has been demonstrated to excel in dealing with short sequences. That means that the present method is very useful in experimental investigation of ionospheric disturbances.