In direction-of-arrival (DOA) estimation with sensor arrays. the background noise is usually modeled to be uncorrelated uniform white noise. such that the related algorithms can be greatly simplified by making use of the property of the noise covariance matrix being a diagonal matrix with identical diagonal entries. However. https://www.diegojavierfares.com/save-now-Caire-SeQual-Eclipse-Battery-Cartridge-for-Eclipse-3-5-Concentrators-top-grab/