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Spatial smoothing

`RSM = spsmooth(R,L)`

`RSM = spsmooth(R,L,'fb')`

computes
an averaged spatial covariance matrix, `RSM`

= spsmooth(`R`

,`L`

)`RSM`

, from
the full spatial covariance matrix, `R`

, using *spatial
smoothing* (see Van Trees [1], p. 605). Spatial smoothing
creates a smaller averaged covariance matrix over *L* maximum
overlapped subarrays. *L* is a positive integer less
than *N*. The resulting covariance matrix, `RSM`

,
has dimensions (*N*–*L*+1)-by-(*N*–*L*+1).
Spatial smoothing is useful when two or more signals are correlated.

[1] Van Trees, H.L. *Optimum Array
Processing*. New York, NY: Wiley-Interscience, 2002.

`aictest`

| `espritdoa`

| `mdltest`

| `rootmusicdoa`