phased.ArrayResponse

Sensor array response

Description

The ArrayResponse object calculates the complex-valued response of a sensor array.

To compute the response of the array for specified directions:

Define and set up your array response calculator. See Construction.
Call step to estimate the response according to the properties of phased.ArrayResponse. The behavior of step 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.ArrayResponse creates an array response System object, H. This object calculates the response of a sensor array for the specified directions. By default, a 2-element uniform linear array (ULA) is used.

H = phased.ArrayResponse(Name,Value) creates object, H, with each specified property Name set to the specified Value. You can specify additional name-value pair arguments in any order as (Name1,Value1,...,NameN,ValueN).

Properties

`SensorArray`	Handle to sensor array used to calculate response Specify the sensor array as a handle. The sensor array must be an array object in the `phased` package. The array can contain subarrays. Default: `phased.ULA` with default property values
`PropagationSpeed`	Signal propagation speed Specify the propagation speed of the signal, in meters per second, as a positive scalar. Default: Speed of light
`WeightsInputPort`	Add input to specify weights To specify weights, set this property to `true` and use the corresponding input argument when you invoke `step`. If you do not want to specify weights, set this property to `false`. Default: `false`
`EnablePolarization`	Enable polarization simulation Set this property to `true` to let the array response simulate polarization. Set this property to `false` to ignore polarization. This property applies only when the array specified in the `SensorArray` property is capable of simulating polarization. Default: `false`

Methods

step	Calculate array response of sensor array

Common to All System Objects
`release`	Allow System object property value changes

Examples

collapse all

Plot Array Response

Open Live Script

Calculate array response for a 4-element uniform linear array (ULA) in the direction of 30 degrees azimuth and 20 degrees elevation. Assume the array's operating frequency is 300 MHz.

Construct ULA and ArrayResponse System objects

fc = 300e6;
c = physconst('LightSpeed');
array = phased.ULA(4);
response = phased.ArrayResponse('SensorArray',array);
resp = response(fc,[30;20])

resp = 
0.2768

Plot the array response in dB

Plot the normalized power in db as an azimuth cut at 0 degrees elevation.

pattern(array,fc,[-180:180],0,'PropagationSpeed',c,'CoordinateSystem','rectangular','Type','powerdb')

Figure contains an axes object. The axes object with title Azimuth Cut (elevation angle = 0.0°), xlabel Azimuth Angle (degrees), ylabel Normalized Power (dB) contains an object of type line. This object represents 300 MHz.