DOA Ordinal Estimation Method in Nonstationary Noise Background
Yongshun Zhang · Modern Defence Technology · 2011
A new ordinal estimation method combining oblique projector and cross correlation vectors Toeplitz reconstruction(CVTR) algorithm is proposed when uncorrelated,partially correlated and coherent sources coexist.With this algorithm,the coherent and incoherent sources are estimated separately.The coherent sources are renewed to full rank with CVTR method to avoid the significant loss of array aperture and high computation of the conventional smoothing method.The oblique projector instead of differencing method is used to make the algorithm work without the restriction of Toeplitz configuration.Therefore,the algorithm is suitable for arbitrary array structure.This method can obviously improve the overload capability ti resolve sources,and along with the matrix reconstruction,the nonstationary noise is transformed to white noise.As a result,the method discussed can fully eliminate nonstationary noise.