phased.ESPRITEstimator
ESPRIT direction of arrival (DOA) estimator for ULA
Description
The phased.ESPRITEstimator
System object™ estimate
the direction of arrival of signals parameters via rotational invariance
(ESPRIT) direction of arrival estimate.
To estimate the direction of arrival (DOA):
Define and set up your DOA estimator. See Construction.
Call
step
to estimate the DOA according to the properties ofphased.ESPRITEstimator
. The behavior ofstep
is specific to each object in the toolbox.
Note
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.
Construction
H = phased.ESPRITEstimator
creates an ESPRIT
DOA estimator System object, H
. The object
estimates the signal's directionofarrival (DOA) using the ESPRIT
algorithm with a uniform linear array (ULA).
H = phased.ESPRITEstimator(
creates
object, Name
,Value
)H
, with each specified property Name
set to the specified Value. You can specify additional namevalue
pair arguments in any order as (Name1
,Value1
,...,NameN
,ValueN
).
Properties

Handle to sensor array Specify the sensor array as a handle. The sensor array must
be a Default: 

Signal propagation speed Specify the propagation speed of the signal, in meters per second, as a positive scalar. You can specify this property as single or double precision. Default: Speed of light 

System operating frequency Specify the operating frequency of the system in hertz as a positive scalar. The default value corresponds to 300 MHz. You can specify this property as single or double precision. Default: 

Perform forwardbackward averaging Set this property to Default: 

Spatial smoothing Specify the number of averaging used by spatial smoothing to estimate the covariance matrix as a nonnegative integer. Each additional smoothing handles one extra coherent source, but reduces the effective number of element by 1. The maximum value of this property is M–2, where M is the number of sensors. You can specify this property as single or double precision. Default: 

Source of number of signals Specify the source of the number of signals as one of Default: 

Method to estimate number of signals Specify the method to estimate the number of signals as one
of Default: 

Number of signals Specify the number of signals as a positive integer scalar. This property applies when you set
the Default: 

Type of least squares method Specify the least squares method used for ESPRIT as one of Default: 

Row weighting factor Specify the row weighting factor for signal subspace eigenvectors as a positive integer
scalar. This property controls the weights applied to the selection matrices. In most cases
the higher value the better. However, it can never be greater than (Nsub –
1)/2 where Nsub is the number of elements in the subarray
derived from the array specified in the Default: 
Methods
step  Perform DOA estimation 
Common to All System Objects  

release  Allow System object property value changes 
Examples
Algorithms
References
[1] Van Trees, H. Optimum Array Processing. New York: WileyInterscience, 2002.