EngeePhased.ULA
Uniform linear Phased array (ULA).
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Description
System object EngeePhased.ULA simulates a uniform linear antenna array (uniform linear array, ULA).
To create and use an ULA, follow these steps:
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Create an object EngeePhased.ULA and set its properties.
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Call the object with arguments as if it were a function.
To learn more about how to work with system objects, see Engee System Objects.
Syntax
Creation
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ula = EngeePhased.ULA()— creates an ULA with default property values. The origin of the local coordinate system is the phase center of the antenna array. The positive axis — this is the direction normal to the antenna array, and the elements of the antenna array are located along the axis . -
ula = EngeePhased.ULA(Name=Value)— creates a uniform ULA with specified properties in the form of a pairName=Value, whereName— the name of the property, andValue— the appropriate value. You can specify multiple pairs «name-value» the order of the pairs does not matter. Unspecified properties retain their default values.
Arguments
Input arguments
FREQ — operating frequencies of the antenna array
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scalar | vector is a string of length L
Details
The operating frequencies of the antenna array, specified as a real positive scalar or a real vector, are strings of length containing positive numbers. Typical values are in the range specified by the properties of the FrequencyRange or FrequencyVector element, depending on the type of element in the antenna array. The element has a zero radiation pattern at frequencies outside this range.
The units of measurement are Hz.
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ANG — azimuth angle and angle of the radiation pattern location
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vector is a string of length M | the 2 by M matrix
Details
The directions of the radiation pattern, specified as a real vector, are strings of length or a real matrix on .
If ANG is a matrix, then each column defines a direction in the form [azimuth; elevation]. The azimuthal angle should be in the range of −180° before 180° inclusive. The angle of the seat should be in the range of −180° before 180° inclusive.
If ANG is a string vector, each element sets the azimuth angle of the direction. In this case, the corresponding seat angle is assumed to be 0°.
The units of measurement are degrees.
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Output arguments
RESP — antenna array radiation pattern
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a complex array of N by M by L
Details
The radiation pattern of the antenna array, returned as a complex array of the size on on , where — the number of elements in the antenna array, — the number of angles specified in ANG, — the number of frequencies specified in FREQ.
Features
# Element — element of the antenna array
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IsotropicAntennaElement (by default) | the system object of the antenna array element
Details
An element of the antenna array, defined as a system object antenna, microphone or converter.
By default, it is used EngeePhased.IsotropicAntennaElement.
# numElements — the number of grid elements
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5 (by default) | a positive integer
Details
The number of grid elements specified as a positive integer.
# ElementSpacing — the distance between the elements of the antenna array
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0.5 (by default) | positive scalar
Details
The distance between two adjacent ULA elements, specified as a positive scalar.
The units of measurement are m.
#
ArrayAxis —
ULA
+ axis
"y" (by default) | "x" | "z"
Details
The ULA axis, defined as "x", "y" or "z".
The ULA elements are located along the selected axis of the coordinate system. The axis of the antenna array determines the direction along which the normal vectors of the elements are directed.
| Value of the ArrayAxis property | The direction of the normal of the lattice element |
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azimuth angle |
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azimuth angle |
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azimuth angle |
# Taper — complex weighting coefficients for amplitude weighing
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1 (by default) | the complex scalar | A complex vector is a row of 1 by N | The complex column vector is N by 1
Details
Complex weighting coefficients for antenna array elements, given as a complex scalar, a complex string vector on or a complex column vector on , where It represents the number of antenna array elements. Weighting factors are applied to each antenna element of the antenna array and change the amplitude and phase of the received data.
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If Taper is a scalar, the same coefficient value is applied to all elements of the antenna array.
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If Taper is a vector, its own coefficient value is applied to each element of the antenna array.