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patternElevation

System object:phased.UCA
Package:phased

Plot UCA array directivity or pattern versus elevation

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Syntax

patternElevation(sArray,FREQ)
patternElevation(sArray,FREQ,AZ)
patternElevation(sArray,FREQ,AZ,Name,Value)
PAT = patternElevation(___)

Description

patternElevation(sArray,FREQ)plots the 2-D array directivity pattern versus elevation (in dBi) for the arraysArrayat zero degrees azimuth angle. WhenAZis a vector, multiple overlaid plots are created. The argumentFREQspecifies the operating frequency.

The integration used when computing array directivity has a minimum sampling grid of 0.1 degrees. If an array pattern has a beamwidth smaller than this, the directivity value will be inaccurate.

patternElevation(sArray,FREQ,AZ), in addition, plots the 2-D element directivity pattern versus elevation (in dBi) at the azimuth angle specified byAZ. WhenAZis a vector, multiple overlaid plots are created.

patternElevation(sArray,FREQ,AZ,Name,Value)plots the array pattern with additional options specified by one or moreName,Valuepair arguments.

PAT= patternElevation(___)returns the array pattern.PATis a matrix whose entries represent the pattern at corresponding sampling points specified by the'Elevation'parameter and theAZinput argument.

Input Arguments

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Uniform circular array, specified as aphased.UCASystem object.

Example:sArray= phased.UCA;

Frequency for computing directivity and pattern, specified as a positive scalar. Frequency units are in hertz.

  • For an antenna or microphone element,FREQmust lie within the range of values specified by theFrequencyRangeor theFrequencyVectorproperty of the element. Otherwise, the element produces no response and the directivity is returned as–Inf. Most elements use theFrequencyRangeproperty except forphased.CustomAntennaElementandphased.CustomMicrophoneElement, which use theFrequencyVectorproperty.

  • For an array of elements,FREQ必须躺在频率范围内的元素s that make up the array. Otherwise, the array produces no response and the directivity is returned as–Inf.

Example:1e8

Data Types:double

Azimuth angles for computing sensor or array directivities and patterns, specified as a 1-by-Nreal-valued row vector whereNis the number of desired azimuth directions. Angle units are in degrees. The azimuth angle must lie between –180° and 180°.

The azimuth angle is the angle between thex-axis and the projection of the direction vector onto thexyplane. This angle is positive when measured from thex-axis toward they-axis.

Example:[0,10,20]

Data Types:double

Name-Value Arguments

Specify optional pairs of arguments asName1=Value1,...,NameN=ValueN, whereNameis the argument name andValueis the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and encloseNamein quotes.

Displayed pattern type, specified as the comma-separated pair consisting of'Type'and one of

  • 'directivity'— directivity pattern measured in dBi.

  • 'efield'— field pattern of the sensor or array. For acoustic sensors, the displayed pattern is for the scalar sound field.

  • 'power'— power pattern of the sensor or array defined as the square of the field pattern.

  • 'powerdb'— power pattern converted to dB.

Example:'powerdb'

Data Types:char

Signal propagation speed, specified as the comma-separated pair consisting of'PropagationSpeed'and a positive scalar in meters per second.

Example:'PropagationSpeed',physconst('LightSpeed')

Data Types:double

Array weights, specified as the comma-separated pair consisting of“重量”and anM1复值列向量. Array weights are applied to the elements of the array to produce array steering, tapering, or both. The dimensionMis the number of elements in the array.

Note

Use complex weights to steer the array response toward different directions. You can create weights using thephased.SteeringVectorSystem object or you can compute your own weights. In general, you apply Hermitian conjugation before using weights in any Phased Array System Toolbox™ function or System object such asphased.Radiatororphased.Collector. However, for thedirectivity,pattern,patternAzimuth, andpatternElevationmethods of any array System object use the steering vector without conjugation.

Example:“重量”,ones(10,1)

Data Types:double
Complex Number Support:Yes

Elevation angles, specified as the comma-separated pair consisting of'Elevation'and a 1-by-Preal-valued row vector. Elevation angles define where the array pattern is calculated.

Example:'Elevation',[-90:2:90]

Data Types:double

Handle to the axes along which the array geometry is displayed specified as a scalar.

Output Arguments

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Array directivity or pattern, returned as anL-by-Nreal-valued matrix. The dimensionLis the number of elevation angles determined by the'Elevation'name-value pair argument. The dimensionNis the number of azimuth angles determined by theAZargument.

Examples

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Open Live Script

Create a 6-element UCA of short-dipole antenna elements. Design the array to have a radius of 0.5 meters. Plot an elevation cut of directivity at 0 and 90 degrees azimuth. Assume the operating frequency is 500 MHz.

fc = 500e6; sCDant = phased.ShortDipoleAntennaElement('FrequencyRange',[100,900]*1e6); sUCA = phased.UCA('NumElements',6,'Radius',0.5,'Element',sCDant); patternElevation(sUCA,fc,[0 90])

You can plot a smaller range of elevation angles by setting theElevationproperty.

patternElevation(sUCA,fc,[0 45],'Elevation',[0:90])

More About

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中on History

Introduced in R2015a

See Also

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