Two-dimensional spatial-spectrum estimationof coherentsignals without spatial smoothing and eigendecomposition
P. Li, Jun Sun, Bo Yu · IEE Proceedings - Radar Sonar and Navigation · 1996
A cross-covariance matrix constructed to be of full rank regardless of the coherence of the signals is suggested to avoid employing the technique of spatial smoothing in two-dimensional (2-D) spatial-spectrurn estimation of coherent signals. The propagator method is used to perform the noise subspace estimation without any eigendecomposition. Futhermore, the new method can handle unknown correlated noise fields. The effects of the unknown noise are eliminated by using a rectangular planar array and a separately placed single sensor. All these properties make real-time implementation of the method possible.