replace
Replace polar plot data with new data
Description
Examples
Replace Cosine Polar Plot with Rotated Cosine Polar Plot
Plot cosine pattern in polar coordinates. Specify a cosine antenna pattern from 0° to 360° in azimuth at 0° elevation. Then, plot the antenna pattern using polarpattern
.
Create the pattern.
az = [0:360]; a = abs(cosd(az));
Plot the polar pattern of the antenna for an azimuth cut at 0° elevation.
P = polarpattern(a,'TitleTopTextInterpreter','tex','TitleTop','Azimuth Cut (Elevation Angle = 0^{\circ})');
Replace this plot with a rotated cosine pattern.
a = abs(cosd(az + 30.0)); replace(P,a);
Replace Polar Plot Data with New Angle-Magnitude Data
Create a 15-element ULA of cosine antennas with elements spaced one-half wavelength apart. Plot the directivity of the array at 20 GHz.
fc = 20.0e9; c = physconst('Lightspeed'); lam = c/fc; angs = [-180:1:180]; antenna = phased.CosineAntennaElement('FrequencyRange',[1.0e9,100.0e9],... 'CosinePower',[2.5 2.5]); array = phased.ULA('Element',antenna,'NumElements',15,'ElementSpacing',lam/2); a = pattern(array,fc,angs,0); P = polarpattern(angs,a);
Then, steer the array to 45° and, using the replace
method, replace the existing polar plot with the steered array directivity.
steervec = phased.SteeringVector('SensorArray',array,'PropagationSpeed',c,... 'IncludeElementResponse',true); sv = steervec(fc,[45;0]); a1 = pattern(array,fc,angs,0,'Weights',sv); replace(P,angs,a1);
Input Arguments
p
— Polar plot
polarpattern
object
Polar plot, specified as a polarpattern
object.
Example: polarpattern
data
— Antenna or array pattern data
real length-M vector | real M-by-N matrix | real N-D array | complex vector or matrix
Antenna or array data, specified as one of the following:
A real length-M vector, where M contains the magnitude values with angles assumed to be degrees.
A real M-by-N matrix, where M contains the magnitude values and N contains the independent data sets. Each column in the matrix has angles taken from the vector degrees. The set of each angle can vary for each column.
A real N-D array, where N is the number of dimensions. Arrays with dimensions
2
and greater are independent data sets.A complex vector or matrix, where
data
contains Cartesian coordinates ((x,y) of each point. x contains the real part ofdata
and y contains the imaginary part ofdata
.
When data is in a logarithmic form such as dB, magnitude values can be
negative. In this case,polarpattern
plots the lowest
magnitude values at the origin of the polar plot and highest magnitude
values at the maximum radius.
Example: pattern(dipole,70e6)
angle
— Set of angles
vector in degrees
Set of angles, specified as a vector in degrees.
magnitude
— Set of magnitude values
vector | matrix
Set of magnitude values, specified as a vector or a matrix. For a matrix of magnitude values, each column is an independent set of magnitude values and corresponds to the same set of angles.
Version History
Introduced in R2016a
See Also
add
| addCursor
| animate
| createLabels
| findLobes
| showPeaksTable
| showSpan
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