Narrowband Receive Array
Receive narrowband radiation using phased array
 Library:
Phased Array System Toolbox / Transmitters and Receivers
Description
The Narrowband Receive Array block implements a narrowband receive array collecting incoming radiation. The array processes narrowband plane waves incident on the sensor elements of the array. The delay at each element is approximated using the corresponding phase shift in the time domain.
Ports
Input
X
— Incident signals
complexvalued MbyLmatrix
Incident signals, specified as a complexvalued
MbyL matrix, where M is
the number of samples in the data, and L is the number of incident
signals. Each column of X
is a far field signal.
The size of the first dimension of the input matrix can vary to simulate a changing signal length. A size change can occur, for example, in the case of a pulse waveform with variable pulse repetition frequency.
Data Types: double
 single
Complex Number Support: Yes
Ang
— Incident signal directions
2
by1
realvalued vector  2
byL realvalued matrix
Incident directions of signals, specified as a realvalued
2
byL matrix. Each column specifies the
incident direction of the corresponding column of X
and takes the
form [azimuth; elevation]. Units are in degrees. The azimuth angle must lie in the
range from –180° to 180°, inclusive. The elevation angle must lie in the range from
–90° to 90°, inclusive.
Data Types: single
 double
W
— Element or subarray weights
complexvalued Pby1 vector
Element or subarray weights, specified as a complexvalued Pby1 column vector where P is the number of array elements (or subarrays when the array supports subarrays).
Dependencies
To enable this port, select the Enable weights input check box.
Data Types: single
 double
WS
— Subarray element weights
complexvalued
N_{SE}byL matrix
Subarray element weights, specified as a complexvalued N_{SE}byL matrix. N_{SE} is the number of subarrays. L is the number of incident signals. The same weight is applied to the individual elements within a subarray.
Subarray Element Weights
Specify sensor array as:  Subarray Weights 

Replicated subarray  All subarrays have the same dimensions and sizes. Then, the
subarray weights form an
N_{SE}byN
matrix. N_{SE} is the number of
elements in each subarray and N is the number of
subarrays. Each column of 
Partitioned array  Subarrays can have different dimensions and sizes. In this case, you can specify subarray weights as

Dependencies
To enable this port, set the Specify sensor array as
parameter to Partitioned array
or Replicated
subarray
and set the Subarray steering method
to Custom
.
Data Types: double
 single
Complex Number Support: Yes
Steer
— Subarray steering angle
realvalued length2 column vector
Subarray steering angle, specified as a realvalued length2 column vector. The vector has the form [azimuth; elevation], in degrees. Units are in degrees. The azimuth angle must lie in the range from –180° to 180°, inclusive. The elevation angle must lie in the range from –90° to 90°, inclusive.
Dependencies
To enable this port, set the Specify sensor array as
parameter to Partitioned array
or Replicated
subarray
and set the Subarray steering method
to Phase
or Time
.
Data Types: single
 double
Output
Y
— Collected signals
complexvalued MbyP matrix
Collected signals, returned as a complexvalued MbyP matrix. M is the length of the input signal. P is the number of array elements (or subarrays when subarrays are supported). Each column corresponds to the signal collected by the corresponding array element (or corresponding subarrays when subarrays are supported).
Data Types: double
 single
Complex Number Support: Yes
Parameters
Signal propagation speed (m/s)
— Signal propagation speed
physconst('LightSpeed')
(default)  realvalued positive scalar
Signal propagation speed, specified as a realvalued positive scalar. The default
value of the speed of light is the value returned by
physconst('LightSpeed')
. Units are in meters per second.
Example: 3e8
Data Types: double
Operating frequency (Hz)
— System operating frequency
3e8
(default)  positive real scalar
System operating frequency, specified as a positive scalar. Units are in Hz.
Sensor gain measure
— Sensor gain measure
dB
(default)  dBi
Sensor gain measure, specified as dB
or
dBi
.
When you set this parameter to
dB
, the input signal power is scaled by the sensor power pattern (in dB) in the corresponding direction and then combined.When you set this parameter to
dBi
, the input signal power is scaled by the directivity pattern (in dBi) in the corresponding direction and then combined. This option is useful when you want to compare results with the values computed by the radar equation that uses dBi to specify the antenna gain. The computation using thedBi
option is costly as it requires an integration over all directions to compute the total radiated power of the sensor.
Data Types: char
 string
Enable weights input
— Option to input weights
off
(default)  on
Select this check box to specify array weights via the input port
W
. The input port appears only when this box is selected.
Simulate using
— Block simulation method
Interpreted Execution
(default)  Code Generation
Block simulation, specified as Interpreted Execution
or
Code Generation
. If you want your block to use the
MATLAB^{®} interpreter, choose Interpreted Execution
. If
you want your block to run as compiled code, choose Code
Generation
. Compiled code requires time to compile but usually runs
faster.
Interpreted execution is useful when you are developing and tuning a model. The block
runs the underlying System object™ in MATLAB. You can change and execute your model quickly. When you are satisfied
with your results, you can then run the block using Code
Generation
. Long simulations run faster with generated code than in
interpreted execution. You can run repeated executions without recompiling, but if you
change any block parameters, then the block automatically recompiles before
execution.
This table shows how the Simulate using parameter affects the overall simulation behavior.
When the Simulink^{®} model is in Accelerator
mode, the block mode specified
using Simulate using overrides the simulation mode.
Acceleration Modes
Block Simulation  Simulation Behavior  
Normal  Accelerator  Rapid Accelerator  
Interpreted Execution  The block executes using the MATLAB interpreter.  The block executes using the MATLAB interpreter.  Creates a standalone executable from the model. 
Code Generation  The block is compiled.  All blocks in the model are compiled. 
For more information, see Choosing a Simulation Mode (Simulink).
Clicking the Analyze button opens the Sensor Array Analyzer app. The app lets you examine important array properties such as array response and array geometry.
Specify sensor array as
— Method to specify array
Array (no subarrays)
(default)  Partitioned array
 Replicated subarray
 MATLAB expression
Method to specify array, specified as Array (no subarrays)
or MATLAB expression
.
Array (no subarrays)
— use the block parameters to specify the array.Partitioned array
— use the block parameters to specify the array.Replicated subarray
— use the block parameters to specify the array.MATLAB expression
— create the array using a MATLAB expression.
Element type
— Array element types
Isotropic Antenna
(default)  Cosine Antenna
 Custom Antenna
 Omni Microphone
 Custom Microphone
Antenna or microphone type, specified as one of the following:
Isotropic Antenna
Cosine Antenna
Custom Antenna
Omni Microphone
Custom Microphone
Operating frequency range (Hz)
— Operating frequency range of the antenna or microphone element
[0,1e20]
(default)  realvalued 1by2 row vector
Specify the operating frequency range of the antenna or microphone element as a 1by2
row vector in the form [LowerBound,UpperBound]
. The element has no
response outside this frequency range. Frequency units are in Hz.
Dependencies
To enable this parameter, set Element type to
Isotropic Antenna
, Cosine Antenna
, or
Omni Microphone
.
Operating frequency vector (Hz)
— Operating frequency range of custom antenna or microphone elements
[0,1e20]
(default)  realvalued row vector
Specify the frequencies at which to set antenna and microphone frequency responses as a 1byL row vector of increasing real values. The antenna or microphone element has no response outside the frequency range specified by the minimum and maximum elements of this vector. Frequency units are in Hz.
Dependencies
To enable this parameter, set Element type to Custom
Antenna
or Custom Microphone
. Use
Frequency responses (dB) to set the responses at these
frequencies.
Baffle the back of the element
— Set back response of an Isotropic Antenna
element or an Omni Microphone
element to
zero
off (default)  on
Select this check box to baffle the back response of the element. When back baffled, the responses at all azimuth angles beyond ±90° from broadside are set to zero. The broadside direction is defined as 0° azimuth angle and 0° elevation angle.
Dependencies
To enable this check box, set
Element type to
Isotropic Antenna
or
Omni Microphone
.
Exponent of cosine pattern
— Exponents of azimuth and elevation cosine patterns
[1.5 1.5]
(default)  nonnegative scalar  realvalued 1by2 matrix of nonnegative values
Specify the exponents of the cosine pattern as a nonnegative scalar or a realvalued 1by2 matrix of nonnegative values. When Exponent of cosine pattern is a 1by2 vector, the first element is the exponent in the azimuth direction and the second element is the exponent in the elevation direction. When you set this parameter to a scalar, both the azimuth direction and elevation direction cosine patterns are raised to the same power.
Dependencies
To enable this parameter, set Element
type to Cosine
Antenna
.
Frequency responses (dB)
— Antenna and microphone frequency response
[0,0]
(default)  realvalued row vector
Frequency response of a custom antenna or custom microphone for the frequencies defined by the Operating frequency vector (Hz) parameter. The dimensions of Frequency responses (dB) must match the dimensions of the vector specified by the Operating frequency vector (Hz) parameter.
Dependencies
To enable this parameter, set
Element type to
Custom Antenna
or
Custom
Microphone
.
Input Pattern Coordinate System
— Coordinate system of custom antenna pattern
azel
(default)  phitheta
Coordinate system of custom antenna pattern, specified
azel
or phitheta
. When you
specify azel
, use the Azimuth angles
(deg) and Elevations angles (deg) parameters to
specify the coordinates of the pattern points. When you specify
phitheta
, use the Phi angles (deg)
and Theta angles (deg) parameters to specify the coordinates of the
pattern points.
Dependencies
To enable this parameter, set Element type to
Custom Antenna
.
Azimuth angles (deg)
— Azimuth angles of antenna radiation pattern
[180:180]
(default)  realvalued row vector
Specify the azimuth angles at which to calculate the antenna radiation pattern as a 1byP row vector. P must be greater than 2. Azimuth angles must lie between –180° and 180°, inclusive, and be in strictly increasing order.
Dependencies
To enable this parameter, set the Element type
parameter to Custom Antenna
and the
Input Pattern Coordinate System
parameter to azel
.
Elevation angles (deg)
— Elevation angles of antenna radiation pattern
[90:90]
(default)  realvalued row vector
Specify the elevation angles at which to compute the radiation pattern as a 1byQ vector. Q must be greater than 2. Angle units are in degrees. Elevation angles must lie between –90° and 90°, inclusive, and be in strictly increasing order.
Dependencies
To enable this parameter, set the Element type
parameter to Custom Antenna
and the
Input Pattern Coordinate System
parameter to azel
.
Phi Angles (deg)
— Phi angle coordinates of custom antenna radiation pattern
0:360
 realvalued 1byP row vector
Phi angles of points at which to specify the antenna radiation pattern, specify as a realvalued 1byP row vector. P must be greater than 2. Angle units are in degrees. Phi angles must lie between 0° and 360° and be in strictly increasing order.
Dependencies
To enable this parameter, set the Element type parameter to
Custom Antenna
and the Input Pattern Coordinate
System parameter to phitheta
.
Theta Angles (deg)
— Theta angle coordinates of custom antenna radiation pattern
0:180
 realvalued 1byQ row vector
Theta angles of points at which to specify the antenna radiation pattern, specify as a realvalued 1byQ row vector. Q must be greater than 2. Angle units are in degrees. Theta angles must lie between 0° and 360° and be in strictly increasing order.
Dependencies
To enable this parameter, set the Element type parameter to
Custom Antenna
and the Input Pattern Coordinate
System parameter to phitheta
.
Magnitude pattern (dB)
— Magnitude of combined antenna radiation pattern
zeros(181,361)
(default)  realvalued QbyP matrix  realvalued QbyPbyL
array
Magnitude of the combined antenna radiation pattern, specified as a QbyP matrix or a QbyPbyL array.
When the Input Pattern Coordinate System parameter is set to
azel
, Q equals the length of the vector specified by the Elevation angles (deg) parameter and P equals the length of the vector specified by the Azimuth angles (deg) parameter.When the Input Pattern Coordinate System parameter is set to
phitheta
, Q equals the length of the vector specified by the Theta Angles (deg) parameter and P equals the length of the vector specified by the Phi Angles (deg) parameter.
The quantity L equals the length of the Operating frequency vector (Hz).
If this parameter is a QbyP matrix, the same pattern is applied to all frequencies specified in the Operating frequency vector (Hz) parameter.
If the value is a QbyPbyL array, each QbyP page of the array specifies a pattern for the corresponding frequency specified in the Operating frequency vector (Hz) parameter.
Dependencies
To enable this parameter, set Element type to
Custom Antenna
.
Phase pattern (deg)
— Custom antenna radiation phase pattern
zeros(181,361)
(default)  realvalued QbyP matrix  realvalued QbyPbyL
array
Phase of the combined antenna radiation pattern, specified as a QbyP matrix or a QbyPbyL array.
When the Input Pattern Coordinate System parameter is set to
azel
, Q equals the length of the vector specified by the Elevation angles (deg) parameter and P equals the length of the vector specified by the Azimuth angles (deg) parameter.When the Input Pattern Coordinate System parameter is set to
phitheta
, Q equals the length of the vector specified by the Theta Angles (deg) parameter and P equals the length of the vector specified by the Phi Angles (deg) parameter.
The quantity L equals the length of the Operating frequency vector (Hz).
If this parameter is a QbyP matrix, the same pattern is applied to all frequencies specified in the Operating frequency vector (Hz) parameter.
If the value is a QbyPbyL array, each QbyP page of the array specifies a pattern for the corresponding frequency specified in the Operating frequency vector (
Dependencies
To enable this parameter, set Element type to
Custom Antenna
.
MatchArrayNormal
— Rotate antenna element to array normal
on
(default)  off
Select this check box to rotate the antenna element pattern to align with the array normal. When not selected, the element pattern is not rotated.
When the antenna is used in an antenna array and the Input Pattern Coordinate System parameter is azel
, selecting this check box rotates the pattern so that the xaxis of the element coordinate system points along the array normal. Not selecting uses the element pattern without the rotation.
When the antenna is used in an antenna array and Input Pattern Coordinate System is set to phitheta
, selecting this check box rotates the pattern so that the zaxis of the element coordinate system points along the array normal.
Use the parameter in conjunction with the Array normal parameter of the URA
and UCA
arrays.
Dependencies
To enable this parameter, set Element type to Custom Antenna
.
Polar pattern frequencies (Hz)
— Polar pattern microphone response frequencies
1e3 (default)  real scalar  realvalued 1byL row vector
Polar pattern microphone response frequencies, specified as a real scalar, or a realvalued, 1byL vector. The response frequencies lie within the frequency range specified by the Operating frequency vector (Hz) vector.
Dependencies
To enable this parameter, set Element type set to
Custom Microphone
.
Polar pattern angles (deg)
— Polar pattern response angles
[180:180]
(default)  realvalued byP row vector
Specify the polar pattern response angles, as a 1byP vector. The angles are measured from the central pickup axis of the microphone and must be between –180° and 180°, inclusive.
Dependencies
To enable this parameter, set Element type to
Custom Microphone
.
Polar pattern (dB)
— Custom microphone polar response
zeros(1,361)
(default)  realvalued LbyP matrix
Specify the magnitude of the custom microphone element polar patterns as an LbyP matrix. L is the number of frequencies specified in Polar pattern frequencies (Hz). P is the number of angles specified in Polar pattern angles (deg). Each row of the matrix represents the magnitude of the polar pattern measured at the corresponding frequency specified in Polar pattern frequencies (Hz) and all angles specified in Polar pattern angles (deg). The pattern is measured in the azimuth plane. In the azimuth plane, the elevation angle is 0° and the central pickup axis is 0° degrees azimuth and 0° degrees elevation. The polar pattern is symmetric around the central axis. You can construct the microphone response pattern in 3D space from the polar pattern.
Dependencies
To enable this parameter, set Element type to
Custom Microphone
.
Geometry
— Array geometry
ULA
(default)  URA
 UCA
 Conformal Array
Array geometry, specified as one of
ULA
— Uniform linear arrayURA
— Uniform rectangular arrayUCA
— Uniform circular arrayConformal Array
— arbitrary element positions
Number of elements
— Number of array elements
2
for ULA arrays and 5
for UCA
arrays (default)  integer greater than or equal to 2
The number of array elements for ULA or UCA arrays, specified as an integer greater than or equal to 2.
When you set Specify sensor array as to Replicated
subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter, set Geometry to
ULA
or UCA
.
Element spacing (m)
— Spacing between array elements
0.5
for ULA arrays and [0.5,0.5]
for URA arrays (default)  positive scalar for ULA or URA arrays  2element vector of positive values for URA arrays
Spacing between adjacent array elements:
ULA — specify the spacing between two adjacent elements in the array as a positive scalar.
URA — specify the spacing as a positive scalar or a 1by2 vector of positive values. If Element spacing (m) is a scalar, the row and column spacings are equal. If Element spacing (m) is a vector, the vector has the form
[SpacingBetweenArrayRows,SpacingBetweenArrayColumns]
.When you set Specify sensor array as to
Replicated subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter, set Geometry to
ULA
or URA
.
Array axis
— Linear axis direction of ULA
y
(default)  x
 z
Linear axis direction of ULA, specified as y
,
x
, or z
. All ULA array
elements are uniformly spaced along this axis in the local array coordinate
system.
Dependencies
To enable this parameter, set Geometry to
ULA
.This parameter is also enabled when the block only supports ULA arrays.
Array size
— Dimensions of URA array
[2,2]
(default)  positive integer  1by2 vector of positive integers
Dimensions of a URA array, specified as a positive integer or 1by2 vector of positive integers.
If Array size is a 1by2 vector, the vector has the form
[NumberOfArrayRows,NumberOfArrayColumns]
.If Array size is an integer, the array has the same number of rows and columns.
When you set Specify sensor array as to
Replicated subarray
, this parameter applies to each subarray.
For a URA, array elements are indexed from top to bottom along the
leftmost column, and then continue to the next columns from left to right. In this
figure, the Array size value of [3,2]
creates an
array having three rows and two columns.
Dependencies
To enable this parameter, set Geometry to
URA
.
Element lattice
— Lattice of URA element positions
Rectangular
(default)  Triangular
Lattice of URA element positions, specified as Rectangular
or Triangular
.
Rectangular
— Aligns all the elements in row and column directions.Triangular
— Shifts the evenrow elements of a rectangular lattice toward the positive rowaxis direction. The displacement is onehalf the element spacing along the row dimension.
Dependencies
To enable this parameter, set Geometry to
URA
.
Array normal
— Array normal direction
x
for URA arrays or
z
for UCA
arrays (default)  y
Array normal direction, specified as
x
,
y
, or
z
.
Elements of planar arrays lie in a plane orthogonal to the selected array normal direction. Element boresight directions point along the array normal direction.
Array Normal Parameter Value  Element Positions and Boresight Directions 

x  Array elements lie in the yzplane. All element boresight vectors point along the xaxis. 
y  Array elements lie in the zxplane. All element boresight vectors point along the yaxis. 
z  Array elements lie in the xyplane. All element boresight vectors point along the zaxis. 
Dependencies
To enable this parameter, set
Geometry to
URA
or
UCA
.
Radius of UCA (m)
— UCA array radius
0.5 (default)  positive scalar
Radius of UCA array, specified as a positive scalar.
Dependencies
To enable this parameter, set Geometry to
UCA
.
Element positions (m)
— Positions of conformal array elements
[0;0;0]
(default)  3byNmatrix of real values
Positions of the elements in a conformal array, specified as a
3byN matrix of real values, where N is the
number of elements in the conformal array. Each column of this matrix represents the
position [x;y;z]
of an array element in the array local coordinate
system. The origin of the local coordinate system is (0,0,0). Units
are in meters.
When you set Specify sensor array as to Replicated
subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter set Geometry to Conformal
Array
.
Element normals (deg)
— Direction of conformal array element normal vectors
[0;0]
 2by1 column vector  2byN matrix
Direction of element normal vectors in a conformal array, specified as a 2by1 column
vector or a 2byN matrix. N indicates the number
of elements in the array. For a matrix, each column specifies the normal direction of
the corresponding element in the form [azimuth;elevation]
with
respect to the local coordinate system. The local coordinate system aligns the positive
xaxis with the direction normal to the conformal array. If the
parameter value is a 2by1 column vector, the same pointing direction is used for all
array elements.
When you set Specify sensor array as to Replicated
subarray
, this parameter applies to each subarray.
You can use the Element positions (m) and Element normals (deg) parameters to represent any arrangement in which pairs of elements differ by certain transformations. The transformations can combine translation, azimuth rotation, and elevation rotation. However, you cannot use transformations that require rotation about the normal direction.
Dependencies
To enable this parameter, set Geometry to
Conformal Array
.
Taper
— Array element tapers
1 (default)  complexvalued scalar  complexvalued row vector
Element tapering, specified as a complexvalued scalar or a complexvalued 1byN row vector. In this vector, N represents the number of elements in the array.
Also known as element weights, tapers multiply the array element responses. Tapers modify both amplitude and phase of the response to reduce side lobes or steer the main response axis.
If Taper is a scalar, the same weight is applied to each element. If Taper is a vector, a weight from the vector is applied to the corresponding sensor element. The number of weights must match the number of elements of the array.
When you set Specify sensor array as to
Replicated subarray
, this
parameter applies to each subarray.
Subarray definition matrix
— Define elements belonging to subarrays
logical matrix
Specify the subarray selection as an MbyN matrix. M is the number of subarrays and N is the total number of elements in the array. Each row of the matrix represents a subarray and each entry in the row indicates when an element belongs to the subarray. When the entry is zero, the element does not belong the subarray. A nonzero entry represents a complexvalued weight applied to the corresponding element. Each row must contain at least one nonzero entry.
The phase center of each subarray lies at the subarray geometric center. The subarray geometric center depends on the Subarray definition matrix and Geometry parameters.
Dependencies
To enable this parameter, set Specify sensor array as to
Partitioned array
.
Subarray steering method
— Specify subarray steering method
None
(default)  Phase
 Time
Subarray steering method, specified as one of
None
Phase
Time
Custom
Selecting Phase
or Time
opens the
Steer
input port on the Narrowband Receive Array,
Narrowband Transmit Array, Wideband Receive Array,
Wideband Transmit Array blocks, Constant Gamma
Clutter, and GPU Constant Gamma Clutter blocks.
Selecting Custom
opens the WS
input port on the
Narrowband Receive Array, Narrowband Transmit Array,
Wideband Receive Array, Wideband Transmit Array
blocks, Constant Gamma Clutter, and GPU Constant Gamma
Clutter blocks.
Dependencies
To enable this parameter, set Specify sensor array as to
Partitioned array
or Replicated
subarray
.
Phase shifter frequency (Hz)
— Subarray phase shifting frequency
3.0e8
(default)  positive realvalued scalar
Operating frequency of subarray steering phase shifters, specified as a positive realvalued scalar. Units are Hz.
Dependencies
To enable this parameter, set Sensor array to
Partitioned array
or Replicated subarray
and set Subarray steering method to
Phase
.
Number of bits in phase shifters
— Subarray steering phase shift quantization bits
0
(default)  nonnegative integer
Subarray steering phase shift quantization bits, specified as a nonnegative integer. A value of zero indicates that no quantization is performed.
Dependencies
To enable this parameter, set Sensor array to
Partitioned array
or Replicated subarray
and set Subarray steering method to
Phase
.
Subarrays layout
— Subarray position specification
Rectangular
(default)  Custom
Specify the layout of replicated subarrays as Rectangular
or
Custom
.
When you set this parameter to
Rectangular
, use the Grid size and Grid spacing parameters to place the subarrays.When you set this parameter to
Custom
, use the Subarray positions (m) and Subarray normals parameters to place the subarrays.
Dependencies
To enable this parameter, set Sensor array to
Replicated subarray
Grid size
— Dimensions of rectangular subarray grid
[1,2]
(default)
Rectangular subarray grid size, specified as a single positive integer, or a 1by2 row vector of positive integers.
If Grid size is an integer scalar, the array has
an equal number of subarrays in each row and column. If
Grid size is a 1by2 vector of
the form [NumberOfRows, NumberOfColumns]
, the
first entry is the number of subarrays along each column. The
second entry is the number of subarrays in each row. A row is
along the local yaxis, and a column is along
the local zaxis. The figure here shows how
you can replicate a 3by2 URA subarray using a Grid
size of [1,2]
.
Dependencies
To enable this parameter, set Sensor
array to Replicated
subarray
and Subarrays
layout to
Rectangular
.
Grid spacing (m)
— Spacing between subarrays on rectangular grid
Auto
(default)  positive realvalued scalar  1by2 vector of positive realvalues
The rectangular grid spacing of subarrays, specified as a positive, realvalued
scalar, a 1by2 row vector of positive, realvalues, or Auto
. Units
are in meters.
If Grid spacing is a scalar, the spacing along the row and the spacing along the column is the same.
If Grid spacing is a 1by2 row vector, the vector has the form
[SpacingBetweenRows,SpacingBetweenColumn]
. The first entry specifies the spacing between rows along a column. The second entry specifies the spacing between columns along a row.If Grid spacing is set to
Auto
, replication preserves the element spacing of the subarray for both rows and columns while building the full array. This option is available only when you specify Geometry asULA
orURA
.
Dependencies
To enable this parameter, set Sensor array to
Replicated subarray
and Subarrays layout
to Rectangular
.
Subarray positions (m)
— Positions of subarrays
[0,0;0.5,0.5;0,0]
(default)  3byN realvalued matrix
Positions of the subarrays in the custom grid, specified as a real
3byN matrix, where N is the number of
subarrays in the array. Each column of the matrix represents the position of a single
subarray in the array local coordinate system. The coordinates are expressed in the form
[x; y; z]
. Units are in meters.
Dependencies
To enable this parameter, set Sensor array to
Replicated subarray
and Subarrays layout
to Custom
.
Subarray normals
— Direction of subarray normal vectors
[0,0;0,0]
(default)  2byN real matrix
Specify the normal directions of the subarrays in the array. This parameter value is a
2byN matrix, where N is the number of
subarrays in the array. Each column of the matrix specifies the normal direction of the
corresponding subarray, in the form [azimuth;elevation]
. Angle units
are in degrees. Angles are defined with respect to the local coordinate system.
You can use the Subarray positions and Subarray normals parameters to represent any arrangement in which pairs of subarrays differ by certain transformations. The transformations can combine translation, azimuth rotation, and elevation rotation. However, you cannot use transformations that require rotation about the normal.
Dependencies
To enable this parameter, set the Sensor array parameter to
Replicated subarray
and the Subarrays
layout to Custom
.
Version History
Introduced in R2014a
See Also
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