Abstract:

In actual direction-finding systems, the impinging noise is a mixture of white noise and colored noise. The estimation performance of the traditional algorithm used for colored noise tends to decline when it is used under the background of white noise. Accordingly, a new source number estimation method based on the feature eliminated process is proposed in this study. The method performs the feature eliminated process on data covariance firstly. A group of new covariance matrixes according to the eigen-values are obtained. Using the projection matrixes of signal subspace and noise subspace to construct the criterion function,then get the number of signals. Simulation results show that the method proposed can effectively estimate the number of signals under the white noise and colored noise background. The algorithm can estimate the number of sources with high accuracy rate under the condition of small snapshot and low SNR without obvious computation increase.