GCC DOA and TOA
Generalized cross-correlator with phase transform
Libraries:
Phased Array System Toolbox / Direction of Arrival
Description
TheGCC DOA and TOAblock estimates the direction of arrival and time of arrival of a signal at an array. The block uses a generalized cross-correlation with phase transform(GCC-PHAT)algorithm.
Ports
Input
Port_1—Received signal
M-by-Ncomplex-valued matrix
Received signal, input as anM-by-Ncomplex-valued matrix. The quantityMis the number of sample values (snapshots) of the signal andNis the number of sensor elements in the array. For subarrays,Nis the number of subarrays.
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:single
|double
Complex Number Support:Yes
Output
Ang—Direction of arrival
2-by-1 real-valued column vector | scalar
方向的信号,输出为2-1 real-valued column vector in the form[azimuth;elevation]
. If the array is a uniform linear array,Ang
is a scalar representing the broadside angle. Angle units are in degrees defined with respect to the local coordinate system of the array.
Data Types:double
Tau—Time delays of arrival
1-by-Preal-valued row vector
Time delays of arrival, output as 1-by-Preal-valued row vector.Pis the number of sensor pairs selected from the array.
WhenSource of sensor pairsis set to
Auto
,P = N - 1.Nis the number of elements in the array.WhenSource of sensor pairsis set to
Property
,Pis the number of sensor pairs specified by theSensor pairsparameter.
Time units are seconds.
Dependencies
To enable this port, select theEnable delay outputcheck box.
Data Types:double
Rxy—Estimated cross-correlation
(2M+1)-by-Pcomplex-valued matrix
Estimated cross-correlation between pairs of sensors, output as a (2M+1)-by-Pcomplex-valued matrix, wherePis the number of sensor pairs selected from the array.Mis the number of time samples in the input signal.
WhenSource of sensor pairsis set to
Auto
,P = N - 1.Nis the number of elements in the array. The columns inRxy
contain the correlations between the first sensor and all other sensors.WhenSource of sensor pairsis set to
Property
,Pis the number of sensor pairs specified by theSensor pairsparameter. Each column inRxy
contains the correlation for the corresponding pair of sensors.
Dependencies
To enable this port, select theEnable correlation outputcheck box.
Data Types:double
Complex Number Support:Yes
Lag—Time lags
M-by-1 real-valued column vector
Time lags, output as an (2M+1)-by-1 real-valued column vector.Mis the number of time samples in the input signal. Each time lag applies to the corresponding row in the cross-correlation matrix.
Dependencies
To enable this port, select theEnable correlation outputcheck box.
Data Types:double
Parameters
Main Tab
Signal propagation speed (m/s)—Signal propagation speed
physconst('LightSpeed')
(default) | real-valued positive scalar
Signal propagation speed, specified as a real-valued positive scalar. The default value of the speed of light is the value returned byphysconst('LightSpeed')
. Units are in meters per second.
例子:3e8
Data Types:double
Inherit sample rate—从上游继承采样率
on (default) | off
Select this parameter to inherit the sample rate from upstream blocks. Otherwise, specify the sample rate using theSample rate (Hz)parameter.
Data Types:Boolean
Sample rate (Hz)—Sampling rate of signal
1e6
(default) | positive real-valued scalar
Specify the signal sampling rate as a positive scalar. Units are in Hz.
Dependencies
To enable this parameter, clear theInherit sample ratecheck box.
Data Types:double
Source of sensor pairs—Source of sensor pairs
Auto
(default) |Property
Source
Property |
When you set this parameter to |
Auto |
When you set this parameter to |
Sensor pairs—Sensor pairs
[2;1]
(default)
Sensor pairs, specified as a 2-by-Mmatrix of strictly positive integers.
Dependencies
This parameter appears only when you set theSource of sensor pairsparameter toProperty
.
Enable correlation output—Option to enable correlation output
off (default) | on
Check this box to output the correlations computed using the GCC-PHAT algorithm as well as the corresponding lags between sensor pairs. Correlation values are output via theRxy
port. Lag values are output via theLags
port. These ports appear only when you check theEnable correlation outputbox. Clear this check box to disable output of correlations.
Enable delay output—Option to enable delay output
off (default) | on
Select this check box to output the delay corresponding to the arrival angle of a signal between each sensor pair. The delay is output in theTau
port. This port appears only when you check theEnable delay outputbox. Clear this check box to disable output of delays.
Simulate using—Block simulation method
Interpreted Execution
(default) |Code Generation
Block simulation, specified asInterpreted Execution
orCode Generation
. If you want your block to use the MATLAB®interpreter, chooseInterpreted Execution
. If you want your block to run as compiled code, chooseCode 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 usingCode 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 theSimulate usingparameter affects the overall simulation behavior.
When the Simulink®model is inAccelerator
mode, the block mode specified usingSimulate usingoverrides 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, seeChoosing a Simulation Mode(Simulink).
Programmatic Use
Block Parameter:SimulateUsing |
Type:enum |
Values:Interpreted Execution ,Code Generation |
Default:Interpreted Execution |
Sensor Array Tab
Specify sensor array as—Method to specify array
Array (no subarrays)
(default) |Partitioned array
|Replicated subarray
|MATLAB expression
Method to specify array, specified asArray (no subarrays)
orMATLAB 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) |Cardioid Antenna
|Cosine Antenna
|Custom Antenna
|Gaussian Antenna
|Sinc Antenna
|Omni Microphone
|Custom Microphone
Antenna or microphone type, specified as one of the following:
Isotropic Antenna
Cardioid Antenna
Cosine Antenna
Custom Antenna
Gaussian Antenna
Sinc Antenna
Omni Microphone
Custom Microphone
Operating frequency range (Hz)—Operating frequency range of the antenna or microphone element
[0,1e20]
(default) | real-valued 1-by-2 row vector
Specify the operating frequency range of the antenna or microphone element as a 1-by-2 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, setElement typetoIsotropic Antenna
,Cosine Antenna
, orOmni Microphone
.
Baffle the back of the element—Set back response of anIsotropic Antenna
element or anOmni 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, setElement typetoIsotropic Antenna
orOmni Microphone
.
Null axis direction—Null axis direction
-x
(default) |+x
|+y
|-y
|+z
|-z
Dependencies
To enable this parameter, setElement typetoCardioid Antenna
.
Exponent of cosine pattern—Exponents of azimuth and elevation cosine patterns
[1.5 1.5]
(default) | nonnegative scalar | real-valued 1-by-2 matrix of nonnegative values
Specify the exponents of the cosine pattern as a nonnegative scalar or a real-valued 1-by-2 matrix of nonnegative values. WhenExponent of cosine patternis a 1-by-2 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, setElement typetoCosine Antenna
.
Operating frequency vector (Hz)—Operating frequency range of custom antenna or microphone elements
[0,1e20]
(default) | real-valued row vector
Specify the frequencies at which to set antenna and microphone frequency responses as a 1-by-Lrow 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, setElement typetoCustom Antenna
orCustom Microphone
. UseFrequency responses (dB)to set the responses at these frequencies.
Frequency responses (dB)—Antenna and microphone frequency response
[0,0]
(default) | real-valued row vector
Frequency response of a custom antenna or custom microphone for the frequencies defined by theOperating frequency vector (Hz)parameter. The dimensions ofFrequency responses (dB)must match the dimensions of the vector specified by theOperating frequency vector (Hz)parameter.
Dependencies
To enable this parameter, setElement typetoCustom Antenna
orCustom Microphone
.
Input Pattern Coordinate System—Coordinate system of custom antenna pattern
az-el
(default) |phi-theta
Coordinate system of custom antenna pattern, specifiedaz-el
orphi-theta
. When you specifyaz-el
, use the方位的gles (deg)andElevations angles (deg)parameters to specify the coordinates of the pattern points. When you specifyphi-theta
, use thePhi angles (deg)andTheta angles (deg)parameters to specify the coordinates of the pattern points.
Dependencies
To enable this parameter, setElement typetoCustom Antenna
.
方位的gles (deg)—方位的gles of antenna radiation pattern
[-180:180]
(default) | real-valued row vector
Specify the azimuth angles at which to calculate the antenna radiation pattern as a 1-by-Prow vector.P必须大于2。方位的gles must lie between –180° and 180°, inclusive, and be in strictly increasing order.
Dependencies
To enable this parameter, set theElement typeparameter toCustom Antenna
and theInput Pattern Coordinate Systemparameter toaz-el
.
Elevation angles (deg)—Elevation angles of antenna radiation pattern
[-90:90]
(default) | real-valued row vector
Specify the elevation angles at which to compute the radiation pattern as a 1-by-Qvector.Q必须大于2。单位在度. Elevation angles must lie between –90° and 90°, inclusive, and be in strictly increasing order.
Dependencies
To enable this parameter, set theElement typeparameter toCustom Antenna
and theInput Pattern Coordinate Systemparameter toaz-el
.
Phi Angles (deg)—Phi angle coordinates of custom antenna radiation pattern
0:360
| real-valued 1-by-Prow vector
Phi angles of points at which to specify the antenna radiation pattern, specify as a real-valued 1-by-Prow vector.P必须大于2。单位在度. Phi angles must lie between 0° and 360° and be in strictly increasing order.
Dependencies
To enable this parameter, set theElement typeparameter toCustom Antenna
and theInput Pattern Coordinate Systemparameter tophi-theta
.
Theta Angles (deg)—Theta angle coordinates of custom antenna radiation pattern
0:180
| real-valued 1-by-Qrow vector
Theta angles of points at which to specify the antenna radiation pattern, specify as a real-valued 1-by-Qrow vector.Q必须大于2。单位在度. Theta angles must lie between 0° and 360° and be in strictly increasing order.
Dependencies
To enable this parameter, set theElement typeparameter toCustom Antenna
and theInput Pattern Coordinate Systemparameter tophi-theta
.
级pattern (dB)—级of combined antenna radiation pattern
zeros(181,361)
(default) | real-valuedQ-by-Pmatrix | real-valuedQ-by-P-by-Larray
级of the combined antenna radiation pattern, specified as aQ-by-Pmatrix or aQ-by-P-by-Larray.
When theInput Pattern Coordinate Systemparameter is set to
az-el
,Qequals the length of the vector specified by theElevation angles (deg)parameter andPequals the length of the vector specified by the方位的gles (deg)parameter.When theInput Pattern Coordinate Systemparameter is set to
phi-theta
,Qequals the length of the vector specified by theTheta Angles (deg)parameter andPequals the length of the vector specified by thePhi Angles (deg)parameter.
The quantityLequals the length of theOperating frequency vector (Hz).
If this parameter is aQ-by-Pmatrix, the same pattern is applied toallfrequencies specified in theOperating frequency vector (Hz)parameter.
If the value is aQ-by-P-by-Larray, eachQ-by-Ppage of the array specifies a pattern for thecorrespondingfrequency specified in theOperating frequency vector (Hz)parameter.
Dependencies
To enable this parameter, setElement typetoCustom Antenna
.
Phase pattern (deg)—Custom antenna radiation phase pattern
zeros(181,361)
(default) | real-valuedQ-by-Pmatrix | real-valuedQ-by-P-by-Larray
Phase of the combined antenna radiation pattern, specified as aQ-by-Pmatrix or aQ-by-P-by-Larray.
When theInput Pattern Coordinate Systemparameter is set to
az-el
,Qequals the length of the vector specified by theElevation angles (deg)parameter andPequals the length of the vector specified by the方位的gles (deg)parameter.When theInput Pattern Coordinate Systemparameter is set to
phi-theta
,Qequals the length of the vector specified by theTheta Angles (deg)parameter andPequals the length of the vector specified by thePhi Angles (deg)parameter.
The quantityLequals the length of theOperating frequency vector (Hz).
If this parameter is aQ-by-Pmatrix, the same pattern is applied toallfrequencies specified in theOperating frequency vector (Hz)parameter.
If the value is aQ-by-P-by-Larray, eachQ-by-Ppage of the array specifies a pattern for thecorrespondingfrequency specified in theOperating frequency vector (
Dependencies
To enable this parameter, setElement typetoCustom Antenna
.
Align element normal with array normal—Align element normal with array normal
on (default) | off
Dependencies
This parameter is enabled whenElement typeis set toCustom Antenna
.
Radiation pattern beamwidth (deg)—Radiation pattern beamwidth
[10,10]
(default)
Dependencies
This parameter is enabled whenElement typeis set toGaussian Antenna
.
Polar pattern frequencies (Hz)—Polar pattern microphone response frequencies
1e3 (default) | real scalar | real-valued 1-by-Lrow vector
Polar pattern microphone response frequencies, specified as a real scalar, or a real-valued, 1-by-Lvector. The response frequencies lie within the frequency range specified by theOperating frequency vector (Hz)vector.
Dependencies
To enable this parameter, setElement typeset toCustom Microphone
.
Polar pattern angles (deg)—Polar pattern response angles
[-180:180]
(default) | real-valued -by-Prow vector
Specify the polar pattern response angles, as a 1-by-Pvector. 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, setElement typetoCustom Microphone
.
Polar pattern (dB)—Custom microphone polar response
zeros(1,361)
(default) | real-valuedL-by-Pmatrix
Specify the magnitude of the custom microphone element polar patterns as anL-by-Pmatrix.Lis the number of frequencies specified inPolar pattern frequencies (Hz).Pis the number of angles specified inPolar pattern angles (deg). Each row of the matrix represents the magnitude of the polar pattern measured at the corresponding frequency specified inPolar pattern frequencies (Hz)and all angles specified inPolar 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 3-D space from the polar pattern.
Dependencies
To enable this parameter, setElement typetoCustom 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 and5
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 setSpecify sensor array astoReplicated subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter, setGeometrytoULA
orUCA
.
Array size—Dimensions of URA array
[2,2]
(default) | positive integer | 1-by-2 vector of positive integers
Dimensions of a URA array, specified as a positive integer or 1-by-2 vector of positive integers.
IfArray sizeis a 1-by-2 vector, the vector has the form
[NumberOfArrayRows,NumberOfArrayColumns]
.IfArray sizeis an integer, the array has the same number of rows and columns.
When you setSpecify sensor array asto
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, theArray sizevalue of[3,2]
creates an array having three rows and two columns.
Dependencies
To enable this parameter, setGeometrytoURA
.
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 | 2-element 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 1-by-2 vector of positive values. IfElement spacing (m)is a scalar, the row and column spacings are equal. IfElement spacing (m)is a vector, the vector has the form
[SpacingBetweenArrayRows,SpacingBetweenArrayColumns]
.When you setSpecify sensor array asto
Replicated subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter, setGeometrytoULA
orURA
.
Array axis—Linear axis direction of ULA
y
(default) |x
|z
Linear axis direction of ULA, specified asy
,x
, orz
. All ULA array elements are uniformly spaced along this axis in the local array coordinate system.
Dependencies
To enable this parameter, setGeometryto
ULA
.This parameter is also enabled when the block only supports ULA arrays.
Element lattice—Lattice of URA element positions
Rectangular
(default) |Triangular
Lattice of URA element positions, specified asRectangular
orTriangular
.
Rectangular
— Aligns all the elements in row and column directions.Triangular
— Shifts the even-row elements of a rectangular lattice toward the positive row-axis direction. The displacement is one-half the element spacing along the row dimension.
Dependencies
To enable this parameter, setGeometrytoURA
.
Array normal—Array normal direction
x
for URA arrays orz
for UCA arrays (default) |y
Array normal direction, specified asx
,y
, orz
.
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 theyz-plane. All element boresight vectors point along thex-axis. |
y |
Array elements lie in thezx-plane. All element boresight vectors point along they-axis. |
z |
Array elements lie in thexy-plane. All element boresight vectors point along thez-axis. |
Dependencies
To enable this parameter, setGeometrytoURA
orUCA
.
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, setGeometrytoUCA
.
Element positions (m)—Positions of conformal array elements
[0;0;0]
(default) | 3-by-Nmatrix of real values
Positions of the elements in a conformal array, specified as a 3-by-Nmatrix of real values, whereNis 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 setSpecify sensor array astoReplicated subarray
, this parameter applies to each subarray.
Dependencies
To enable this parameter setGeometrytoConformal Array
.
Element normals (deg)—Direction of conformal array element normal vectors
[0;0]
| 2-by-1 column vector | 2-by-Nmatrix
Direction of element normal vectors in a conformal array, specified as a 2-by-1 column vector or a 2-by-Nmatrix.Nindicates 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 positivex-axis with the direction normal to the conformal array. If the parameter value is a 2-by-1 column vector, the same pointing direction is used for all array elements.
When you setSpecify sensor array astoReplicated subarray
, this parameter applies to each subarray.
You can use theElement positions (m)andElement 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, setGeometrytoConformal Array
.
Taper—Array element tapers
1 (default) | complex-valued scalar | complex-valued row vector
Element tapering, specified as a complex-valued scalar or a complex-valued 1-by-Nrow vector. In this vector,Nrepresents the number of elements in the array.
Also known aselement 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.
IfTaperis a scalar, the same weight is applied to each element. IfTaperis 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 setSpecify sensor array astoReplicated subarray
, this parameter applies to each subarray.
Subarray definition matrix—Define elements belonging to subarrays
logical matrix
Specify the subarray selection as anM-by-Nmatrix.Mis the number of subarrays andNis 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 complex-valued 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 theSubarray definition matrixandGeometryparameters.
Dependencies
To enable this parameter, setSpecify sensor array astoPartitioned array
.
Subarray steering method—Specify subarray steering method
None
(default) |Phase
|Time
Subarray steering method, specified as one of
None
Phase
Time
Custom
SelectingPhase
orTime
opens theSteer
input port on theNarrowband Receive Array,Narrowband Transmit Array,Wideband Receive Array,Wideband Transmit Arrayblocks,Constant Gamma Clutter, andGPU Constant Gamma Clutterblocks.
SelectingCustom
opens theWS
input port on theNarrowband Receive Array,Narrowband Transmit Array,Wideband Receive Array,Wideband Transmit Arrayblocks,Constant Gamma Clutter, andGPU Constant Gamma Clutterblocks.
Dependencies
To enable this parameter, setSpecify sensor array astoPartitioned array
orReplicated subarray
.
Phase shifter frequency (Hz)—Subarray phase shifting frequency
3.0e8
(default) | positive real-valued scalar
Operating frequency of subarray steering phase shifters, specified as a positive real-valued scalar. Units are Hz.
Dependencies
To enable this parameter, setSensor arraytoPartitioned array
orReplicated subarray
and setSubarray steering methodtoPhase
.
Number of bits in phase shifters—Subarray steering phase shift quantization bits
0
(default) | non-negative integer
Subarray steering phase shift quantization bits, specified as a non-negative integer. A value of zero indicates that no quantization is performed.
Dependencies
To enable this parameter, setSensor arraytoPartitioned array
orReplicated subarray
and setSubarray steering methodtoPhase
.
Subarrays layout—Subarray position specification
Rectangular
(default) |Custom
Specify the layout of replicated subarrays asRectangular
orCustom
.
When you set this parameter to
Rectangular
, use theGrid sizeandGrid spacingparameters to place the subarrays.When you set this parameter to
Custom
, use theSubarray positions (m)andSubarray normalsparameters to place the subarrays.
Dependencies
To enable this parameter, setSensor arraytoReplicated subarray
Grid size—Dimensions of rectangular subarray grid
[1,2]
(default)
Rectangular subarray grid size, specified as a single positive integer, or a 1-by-2 row vector of positive integers.
IfGrid sizeis an integer scalar, the array has an equal number of subarrays in each row and column. IfGrid sizeis a 1-by-2 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 localy-axis, and a column is along the localz-axis. The figure here shows how you can replicate a 3-by-2 URA subarray using aGrid sizeof[1,2]
.
Dependencies
To enable this parameter, setSensor arraytoReplicated subarray
andSubarrays layouttoRectangular
.
Grid spacing (m)—Spacing between subarrays on rectangular grid
Auto
(default) | positive real-valued scalar | 1-by-2 vector of positive real-values
The rectangular grid spacing of subarrays, specified as a positive, real-valued scalar, a 1-by-2 row vector of positive, real-values, orAuto
. Units are in meters.
IfGrid spacingis a scalar, the spacing along the row and the spacing along the column is the same.
IfGrid spacingis a 1-by-2 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.IfGrid spacingis 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 specifyGeometryasULA
orURA
.
Dependencies
To enable this parameter, setSensor arraytoReplicated subarray
andSubarrays layouttoRectangular
.
Subarray positions (m)—Positions of subarrays
[0,0;0.5,0.5;0,0]
(default) | 3-by-Nreal-valued matrix
Positions of the subarrays in the custom grid, specified as a real 3-by-Nmatrix, whereNis 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, setSensor arraytoReplicated subarray
andSubarrays layouttoCustom
.
Subarray normals—Direction of subarray normal vectors
[0,0;0,0]
(default) | 2-by-Nreal matrix
Specify the normal directions of the subarrays in the array. This parameter value is a 2-by-Nmatrix, whereNis 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 theSubarray positionsandSubarray normalsparameters 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 theSensor arrayparameter toReplicated subarray
and theSubarrays layouttoCustom
.
Expression—MATLAB expression used to create an array
Phased Array System Toolbox™ array System object
MATLAB expression used to create an array, specified as a valid Phased Array System Toolbox array System object.
例子:phased.URA('Size',[5,3])
Dependencies
To enable this parameter, setSpecify sensor array astoMATLAB expression
.
Version History
Introduced in R2015b
See Also
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