BeamformerOrth¶

class
acoular.fbeamform.
BeamformerOrth
¶ Bases:
acoular.fbeamform.BeamformerBase
Orthogonal beamforming, see Sarradj, 2010. Needs apriori beamforming with eigenvalue decomposition (
BeamformerEig
).
beamformer
= Trait(BeamformerEig)¶ BeamformerEig
object that provides data for deconvolution.

freq_data
= Delegate('beamformer')¶ PowerSpectra
object that provides the cross spectral matrix and eigenvalues, is set automatically.

r_diag
= Delegate('beamformer')¶ Flag, if ‘True’ (default), the main diagonal is removed before beamforming, is set automatically.

steer
= Delegate('beamformer')¶ instance of
SteeringVector
or its derived classes, that contains information about the steering vector. Is set automatically.

eva_list
= CArray(dtype=int, …¶ List of components to consider, use this to directly set the eigenvalues used in the beamformer. Alternatively, set
n
.

n
= Int(1)¶ Number of components to consider, defaults to 1. If set,
eva_list
will contain the indices of the n largest eigenvalues. Settingeva_list
afterwards will override this value.

set_eva_list
()¶ sets the list of eigenvalues to consider

calc
(ac, fr)¶ Calculates the Orthogonal Beamforming result for the frequencies defined by
freq_data
.This is an internal helper function that is automatically called when accessing the beamformer’s
result
or calling itssynthetic()
method. Parameters
 acarray of floats
This array of dimension ([number of frequencies]x[number of gridpoints]) is used as callbyreference parameter and contains the calculated value after calling this method.
 frarray of booleans
The entries of this [number of frequencies]sized array are either ‘True’ (if the result for this frequency has already been calculated) or ‘False’ (for the frequencies where the result has yet to be calculated). After the calculation at a certain frequency the value will be set to ‘True’
 Returns
 This method only returns values through the ac and fr parameters
