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Estimate arrival directions of signals using MUSIC

uses
the `doas`

= musicdoa(`covmat`

,`nsig`

)*MUSIC* algorithm to estimate the directions
of arrival, `doas`

, of `nsig`

plane
waves received on a uniform linear array (ULA). The argument `covmat`

is
a positive-definite Hermitian matrix representing the sensor covariance
matrix. Detected sources appear as peaks in the spatial spectrum.
The argument `nsig`

is the number of arriving signals.
Sensor elements are spaced one-half wavelength apart in units of wavelengths.
The function forces exact conjugate symmetry of `covmat`

by
averaging the covariance matrix with its conjugate transpose.