Constant Gamma Clutter

Interference model parameter specified as a scalar. This parameter contains the value , used in the interference model with the constant . The value of depends on both terrain type and operating frequency.

Specify the Earth model used in interference modelling as Flat or Curved.

Specify the minimum range for modelling interference as a positive scalar. The minimum range must be non-negative.

Specify the maximum range for modelling interference as a positive scalar. The maximum range must be greater than the value specified in the Radar height parameters.

The azimuthal angle in the Earth plane relative to which interference spots are generated. Spots are generated symmetrically with respect to this angle.

Specify the azimuth range of each interference spot as a positive scalar.

The azimuth range of each interference spot, specified as a positive scalar.

The coherence time for interference modelling, specified as a positive scalar. When the coherence time expires, the block updates the random numbers used for interference modelling on the next pulse. By default `Inf', the random numbers are never updated.

The propagation velocity of a signal given as a real positive scalar.

By default, the value returned by physconst('LightSpeed') is used for the speed of light.

Interference sampling frequency specified as a positive scalar.

The pulse repetition frequency, PRF, is specified as a positive scalar or vector of strings of positive values.

The output signal format specified as Pulses or Samples.

The number of pulses in the block output, specified as a positive integer.

Dependencies

To use this parameter, set the Output signal format parameters to Pulses.

The number of samples in the block output signal, specified as a positive integer.

Dependencies

To use this parameter, set the Output signal format parameter to Samples.

The operating frequency of the system, given as a positive scalar.

The effective radiated power (ERP) of a radar system, given as a positive scalar.

Radar height above the Earth’s surface, set as a non-negative scalar.

The radar platform motion velocity specified as a non-negative scalar.

Specify the direction of motion of the radar platform as a real vector 2 to 1 in the form [AzimuthAngle;ElevationAngle].

Azimuth and elevation angle shall be measured in the local coordinate system of the radar antenna or antenna array. The azimuth angle shall be in the range of -180° to 180°. The elevation angle shall be in the range of -90° to 90°.

By default, the value of this parameter means that the radar platform moves perpendicular to the direction of the wide side of the radar antenna array.

Specify the three-element vector that defines the eigen yaw, pitch, and roll of the antenna element frame with respect to the inertial frame. These three elements define rotations about the z, y, and x axes, respectively, in this order. The first rotation rotates the axes of the body about the z axis. Since these angles define the internal rotations, the second rotation is performed about the y axis at the new position obtained from the previous rotation. The last rotation around the x axis is performed around the x axis rotated by the first two rotations in the internal system.

Select this check box to use the antenna element weighting input port, W.

A method for specifying an antenna array.

Available values:

Antenna array type.

Available values:

Specify the frequencies at which you want to set the frequency characteristics of the antenna array as a vector of increasing real values in line 1 on L. The antenna has no response outside the frequency range specified by the minimum and maximum elements of this vector.

Dependencies

To use this parameter, set the Element type parameters to Custom Antenna. Use the Frequency responses (dB) parameters to set the responses at these frequencies.

Frequency response of the user antenna array for the frequencies specified by the Operating frequency vector (Hz) parameters. The dimensionality of the Frequency responses (dB) parameter should correspond to the dimensionality of the vector specified by the Operating frequency vector (Hz) parameter.

Dependencies

To use this parameter, set the Element type parameter to Custom Antenna.

The coordinate system of the custom antenna array pattern, specified as az-el or phi-theta.

Dependencies

To use this parameter, set the Element type parameters to Custom Antenna.

Specify the azimuth angles at which the radiation pattern of an antenna array should be calculated as a vector-string 1 to P. P must be greater than 2. The azimuthal angles must lie in the range from -180° to 180° inclusive and be arranged in strictly increasing order.

Dependencies

To use this parameter, set the Element type parameter to Custom Antenna and the Input Pattern Coordinate System parameter to az-el.

Specify the elevation angles at which the radiation pattern as a vector of 1 to Q must be calculated. Q must be greater than 2. The elevation angles must lie in the range from -90° to 90° inclusive and be in strictly increasing order.

Dependencies

To use this parameter, set the Element type parameter to Custom Antenna and the Input Pattern Coordinate System parameter to az-el.

Phi-angles of the antenna array radiation pattern, set as a real vector of rows 1 to P. P must be greater than 2. Phi-angles must lie in the range from 0° to 360° and be arranged in strictly increasing order.

Dependencies

To use this parameter, set the Element type parameter to Custom Antenna and the Input Pattern Coordinate System parameter to phi-theta.

Theta angles of the radiation pattern of the antenna array, given as a real vector of rows 1 to Q. Q must be greater than 2. The Theta angles must lie in the range from 0° to 360° and be arranged in strictly increasing order.

Dependencies

To use this parameter, set the Element type parameter to Custom Antenna and the Input Pattern Coordinate System parameter to phi-theta.

The magnitude of the radiation pattern of a combined antenna array given as a matrix Q on P or an array Q on P on L.

The L value is equal to the length of the operating frequency vector (Hz).

Dependencies

To use this parameter, set the Element type parameters to Custom Antenna.

The phase radiation pattern of a combined antenna array specified as a matrix Q on P or an array of Q on P on L.

The L is equal to the length of the operating frequency vector (Hz).

Dependencies

To use this parameter, set the Element type parameters to Custom Antenna.

Select this checkbox to rotate the antenna element pattern according to the normal of the antenna array.

If the checkbox is not selected, the antenna element pattern is not rotated.

If the antenna is used in an antenna array and the Input Pattern Coordinate System parameters is set to az-el, selecting this check box rotates the pattern so that the x axis of the element coordinate system is along the normal of the array.

If the checkbox is not selected, the pattern of the element without rotation is used.

If the antenna is used in an antenna array and the Input Pattern Coordinate System parameters are set to phi-theta, checking this checkbox rotates the pattern so that the z axis of the element coordinate system is directed along the normal of the array.

Use this parameter in conjunction with the Array normal parameters of the URA and UCA antenna arrays.

Dependencies

To use this parameter, set the Element type parameters to Custom Antenna.

Specify the operating frequency range of the antenna array as a string vector 1 to 2 in the form [LowerBound,UpperBound]. The element has no response outside this frequency range.

Dependencies

To use this parameter, set the Element type parameters to Isotropic Antenna or Cosine Antenna.

Indices of the cosine directional diagram as a non-negative scalar or a real 1 by 2 matrix of non-negative values.

If the Exponent of cosine pattern is a 1 by 2 vector, the first element is the index in the azimuth direction and the second element is the index in the elevation direction. When this parameters is scalar, the cosines in the azimuth and elevation directions are raised to the same degree.

Dependencies

To use this parameter, set the Element type parameter to Cosine Antenna.

Select this check box to silence the response of the element.

When muted, the responses at all azimuth angles greater than ±90° from the broadside are set to zero. The broadside is defined as an azimuth angle of 0° and an elevation angle of 0°.

Dependencies

To use this parameter, set the Element type parameter to Isotropic Antenna.

The geometry of the antenna sublattice, defined as:

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray.

The number of antenna sub-lattice elements for the ULA, specified as an integer greater than or equal to 2.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to ULA or UCA.

Radius of the UCA antenna sublattice, positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to UCA.

The dimensions of the URA antenna sublattice, specified as a positive integer or a vector of positive integers 1 by 2.

For URA, the elements of the antenna sublattice are indexed from top to bottom by the leftmost column and then proceed to the next columns from left to right. The figure shows an antenna sublattice for which the Array size parameters is [3,2], that is, it has three rows and two columns.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to URA.

The distance between neighbouring elements of the antenna sublattice as a positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to ULA or URA.

The direction of the linear axis of the ULA, given as y, x or z. All elements of the ULA antenna sublattice are uniformly distributed along this axis in the local grid coordinate system.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to ULA.

Lattice of URA element positions defined as rectangular or triangular.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to URA or UCA.

The normal direction of the antenna sublattice defined as x, y or z.

The elements of planar sublattices lie in the plane orthogonal to the selected direction of the antenna sublattice normal. The angular coordinate directions of the elements are directed along the normal direction of the antenna sublattice.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to URA or UCA.

The positions of the conformal antenna sublattice elements given as a matrix of real values 3 by N, where N is the number of elements in the conformal sublattice. Each column of this matrix represents the [x;y;z] position of an antenna sublattice element in the local coordinate system of the antenna sublattice. The origin of the local coordinate system is (0,0,0,0).

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to Conformal Array.

The direction of the normal vectors of the elements of a conformal antenna sublattice, given as a 2 by 1 column vector or a 2 by N matrix, where N denotes the number of elements in the antenna sublattice. 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. In the local coordinate system, the positive x axis coincides with the direction of the normal to the conformal antenna sublattice. If the parameters value is a column vector 2 by 1, the same pointing direction is used for all elements of the antenna sublattice.

The parameters Element positions (m) and Element normals (deg) can be used to represent any arrangement in which pairs of elements differ from each other by certain transformations. These transformations may include translation, azimuth rotation, and elevation rotation. However, you cannot use transformations that require rotation with respect to the direction of the normal.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray and the Geometry parameter to Conformal Array.

The change of the directivity diagram of the antenna sublattice elements is specified as a complex scalar or complex vector 1 by N, where N is the number of the antenna sublattice elements.

The coefficients that change the pattern, also called element weights, multiply the responses of the antenna sublattice elements. The coefficients change both the amplitude and phase of the response to reduce side lobes or the direction of the main response axis.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray.

The geometry of the antenna sublattice, defined as:

Dependencies

To use this parameter, set the Specify sensor array as parameters to Array (no subarrays) or Partitioned array.

The number of antenna sub-lattice elements for the ULA, specified as an integer greater than or equal to 2.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to ULA or UCA.

Radius of the UCA antenna sublattice, positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to UCA.

The dimensions of the URA antenna sublattice, specified as a positive integer or a vector of positive integers 1 by 2.

For URA, the elements of the antenna sublattice are indexed from top to bottom by the leftmost column and then proceed to the next columns from left to right. The figure shows an antenna sublattice for which the Array size parameters is [3,2], that is, it has three rows and two columns.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to URA.

The distance between neighbouring elements of the antenna sublattice as a positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to ULA or URA.

The direction of the linear axis of the ULA, given as y, x or z. All elements of the ULA antenna sublattice are uniformly distributed along this axis in the local grid coordinate system.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to ULA.

Lattice of URA element positions defined as rectangular or triangular.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to URA or UCA.

The normal direction of the antenna sublattice defined as x, y or z.

The elements of planar sublattices lie in the plane orthogonal to the selected direction of the antenna sublattice normal. The angular coordinate directions of the elements are directed along the normal direction of the antenna sublattice.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays) and the Geometry parameter to URA or UCA.

The positions of the conformal antenna sublattice elements given as a matrix of real values 3 by N, where N is the number of elements in the conformal sublattice. Each column of this matrix represents the [x;y;z] position of an antenna sublattice element in the local coordinate system of the antenna sublattice. The origin of the local coordinate system is (0,0,0,0).

Dependencies

To use this parameter, set the Specify sensor array as parameter to Partitioned array or Array (no subarrays) and the Geometry parameter to Conformal Array.

The direction of the normal vectors of the elements of a conformal antenna sublattice, given as a vector-column 2 by 1 or a matrix 2 by N, where N denotes the number of elements in the antenna sublattice. 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. In the local coordinate system, the positive x axis coincides with the direction of the normal to the conformal antenna sublattice. If the parameters value is a column vector 2 by 1, the same pointing direction is used for all elements of the antenna sublattice.

The parameters Element positions (m) and Element normals (deg) can be used to represent any arrangement in which pairs of elements differ from each other by certain transformations. These transformations may include translation, azimuth rotation, and elevation rotation. However, you cannot use transformations that require rotation with respect to the direction of the normal.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Partitioned array or Array (no subarrays) and the Geometry parameter to Conformal Array.

The change of the directivity diagram of the antenna sublattice elements is specified as a complex scalar or complex vector 1 by N, where N is the number of the antenna sublattice elements.

The coefficients that change the pattern, also called element weights, multiply the responses of the antenna sublattice elements. The coefficients change both the amplitude and phase of the response to reduce side lobes or the direction of the main response axis.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray.

Specify an antenna sublattice as a M by N matrix. M is the number of antenna sublattices and N is the total number of elements in the antenna array. Each row of the matrix represents an antenna sublattice, and each entry in the row indicates when an element belongs to an antenna sublattice.

If the entry is zero, the element does not belong to the antenna sublattice. A non-zero entry represents the complex weighting factor applied to the corresponding element. Each row must contain at least one non-zero entry.

The phase centre of each antenna sublattice is at the geometric centre of the antenna sublattice. The geometric centre of an antenna sublattice depends on the antenna sublattice definition matrix and the Geometry parameters.

Dependencies

To use this parameter, set the Specify sensor array as parameters to Partitioned array or Array (no subarrays).

Specify the location of the replicated antenna sublattice.

Dependencies

To use this parameter, set the Sensor array parameters to Replicated subarray.

Rectangular antenna sub-grid mesh size, specified as a single positive integer or a vector-string of positive integers 1 by 2.

Dependencies

To use this parameter, set the Sensor array parameter to Replicated subarray and the Subarrays layout parameter to Rectangular.

The distance between antenna sublattices on a rectangular grid, given as a positive real scalar or vector 1 by 2 or Auto.

If the Grid spacing parameters are set to Auto, replication preserves the spacing between subgrid elements for both rows and columns when building a complete antenna array. This option is available only if ULA or URA is selected for the Geometry parameters.

Dependencies

To use this option, set the Sensor array parameters to Replicated subarray and the Subarrays layout parameters to Rectangular.

The positions of antenna sub-arrays in the user’s grid, specified as a real matrix 3 by N, where N is the number of sub-arrays in the antenna array. Each column of the matrix represents the position of one sublattice in the local coordinate system of the antenna array. The coordinates are expressed as [x; y; z].

Dependencies

To use this parameter, set the Sensor array parameter to Replicated subarray and the Subarrays layout parameter to Custom.

The direction of the normal of the sublattice normals of the antenna array. The value of this parameter is a matrix of size 2 by N, where N is the number of sublattices in the antenna array. Each column of the matrix specifies the normal direction of the corresponding sublattice in the form [azimuth;elevation]. The angles are defined relative to the local coordinate system.

The parameters Subarray positions and Subarray normals can be used to represent any arrangement in which pairs of antenna sublattices are distinguished by certain transformations. These transformations may include translation, azimuth rotation, and elevation rotation. However, transformations that require rotation with respect to the normal cannot be used.

Dependencies

To use this parameter, set the Sensor array parameter to Replicated subarray and the Subarrays layout parameter to Custom.

A sublattice control method defined as:

Dependencies

To use this parameter, set the Specify sensor array as parameters to Partitioned Array or Replicated subarray.

The operating frequency of the sublattice phase shift, specified as a positive real scalar.

Dependencies

To use this parameter, set the Sensor array parameter to Partitioned array or Replicated subarray and set the Subarray steering method parameter to Phase.

BSpecify sensor array sublattice phase shift quantisation bits specified as a non-negative integer. A value equal to zero means that quantisation is not performed.

Dependencies

To use this parameter, set the Sensor array parameter to Partitioned array or Replicated subarray and set the Subarray steering method parameter to Phase.