System object: phased.PhaseShiftBeamformer
Package: phased
Perform phase shift beamforming
Y = step(H,X)
Y = step(H,X,ANG)
[Y,W] =
step(___)
Starting in R2016b, instead of using the step
method
to perform the operation defined by the System
object™, you can
call the object with arguments, as if it were a function. For example, y
= step(obj,x)
and y = obj(x)
perform
equivalent operations.
performs
phase shift beamforming on the input, Y
= step(H
,X
)X
, and
returns the beamformed output in Y
.
uses Y
= step(H
,X
,ANG
)ANG
as
the beamforming direction. This syntax is available when you set the DirectionSource
property
to 'Input port'
.
[
returns the beamforming weights, Y
,W
] =
step(___)W
.
This syntax is available when you set the WeightsOutputPort
property
to true
.
The object performs an initialization the first time the step
method
is executed. This initialization locks nontunable
properties (MATLAB) and input specifications, such as dimensions, complexity,
and data type of the input data. If you change a nontunable property
or an input specification, the System
object issues an error.
To change nontunable properties or inputs, you must first call the release
method
to unlock the object.

Beamformer object. 

Input signal, specified as an MbyN matrix. If the sensor array contains subarrays, N is the number of subarrays; otherwise, N is the number of elements. The size of the first dimension of this input matrix can vary to simulate a changing signal length, such as a pulse waveform with variable pulse repetition frequency. 

Beamforming directions, specified as a tworow matrix. Each column has the form [AzimuthAngle; ElevationAngle], in degrees. Each azimuth angle must be between –180 and 180 degrees, and each elevation angle must be between –90 and 90 degrees. 

Beamformed output. 

Beamforming weights. 
The phase shift beamformer uses the conventional delayandsum beamforming algorithm. The beamformer assumes the signal is narrowband, so a phase shift can approximate the required delay. The beamformer preserves the incoming signal power.
For further details, see [1].
[1] Van Trees, H. Optimum Array Processing. New York: WileyInterscience, 2002.