Detection of the Number of Signals Using the Transformed Rotational Matrix and General Conjugate Residue Method
Hong Lei · Science Technology and Engineering · 2009
Detection of the number of signals plays an important role in high resolution bearing estimation algorithms.A robust number-of-source detection method is presented with low detection error rate—VTRS-GCR,which utilizes the tendency to zero of the variance of transformed rotational submatrix(VTRS) and the general conjugate residue method(GCR) to obtain the estimate of transformed rotational matrix.This method applies to arbitrary to subarray geometries.Besides,no subjective threshold or extra parameter is required.Combined with spatial smoothing,this method can also detect coherent signals.According to the simulation,this method shows high robustness in the case of low SNR and small snapshot.In addition,it can also perform very well when the additive noise is colored noise or the number of signal is large.