[PCG21-P05] Evaluation of Direction Finding Methods based on Spectral Matrix
Keywords:Waves in plasma, Direction finding
In general, spectral matrix composed by cross-spectra of observed signals is used for direction finding, and many algorithms have been proposed. For example, Means method and SVD method can be applied on the assumption that the spectral matrix is consists of a single plane wave,while wave distribution function (WDF) method is applicable even to the data in which multiple numbers of plane waves are simultaneously included. The estimation accuracy of these direction finding methods is fundamentally dominated by the average duration and the sample size of the cross-spectra. The dominant parameters therefore should be determined adequately for the reliable estimation. In order to understand the influence due to the parameters on the direction finding, we evaluated the accuracy of the estimation results of some methods with various parameters by using the PWE/WFC data. In this presentation, we introduce these results.