Constant Gamma Clutter

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

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

Specify the minimum range for interference simulation in the form of a positive scalar. The minimum range must be non-negative.

Specify the maximum range for interference simulation in the form of a positive scalar. The maximum range must be greater than the value specified in the Radar height parameter.

The azimuthal angle in the Earth’s plane relative to which the interference spots are generated. The spots are generated symmetrically relative to this angle.

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

The azimuthal range of each interference spot, given as a positive scalar.

The coherence time for interference simulation, given as a positive scalar. After the coherence time has elapsed, the unit updates the random numbers used to simulate interference at the next pulse. When using the default value Inf the random numbers are never updated.

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

By default, the speed of light is set to the value returned by the physconst('LightSpeed') function.

The interference sampling rate, set as a positive scalar.

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

The output signal format, set as Pulses or Samples.

The number of pulses in the output of the unit, set as a positive integer.

Dependencies

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

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

Dependencies

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

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

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

The height of the radar above the Earth’s surface is set as a non-negative scalar.

The speed of movement of the radar platform, set as a non-negative scalar.

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

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

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

Specify a three-element vector that defines the proper yaw, pitch, and roll of the antenna element frame relative to the inertial frame. These three elements define rotation around the axes z, y, and x, respectively, in that order. The first rotation rotates the body’s axes around the z axis. Since these angles determine the internal rotations, the second rotation is performed around the y axis in a new position resulting 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 option to use the input port of the antenna element weights, W.

The method of setting the antenna array.

Available values:

The type of antenna array.

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 to 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 parameter to Custom Antenna. Use the Frequency responses (dB) parameter to set the responses at these frequencies.

The frequency response of the user antenna array for the frequencies specified by the parameter Operating frequency vector (Hz). The dimension of the Frequency responses (dB) parameter must correspond to the dimension 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 user directional pattern of the antenna array, set as az-el or phi-theta.

Dependencies

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

Specify the azimuthal angles at which it is necessary to calculate the radiation pattern of the antenna array, in the form of a vector row 1 on P. P must be greater than 2. The azimuthal angles should be in the range from -180° to 180° inclusive and arranged in strictly ascending order.

Dependencies

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

Specify the angles of the location at which it is necessary to calculate the radiation pattern in the form of a vector 1 by Q. Q must be greater than 2. The angles of the seat must range from -90° to 90° inclusive and be arranged in strictly ascending order.

Dependencies

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

Phi are the angles of the radiation pattern of the antenna array, set as a real vector of lines 1 on P. P must be greater than 2. The Phi angles must range from 0° to 360° and be arranged in strictly ascending order.

Dependencies

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

Theta are the angles of the radiation pattern of the antenna array, set as a real vector of lines 1 by Q. Q must be greater than 2. The Theta angles should range from 0° to 360° and be arranged in strictly ascending order.

Dependencies

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

The value of the radiation pattern of the combined antenna array, set as a matrix Q on P or a lattice Q on P on L.

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

_ Dependencies_

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

The phase radiation pattern of a combined antenna array, defined as a matrix of Q by P or an array of Q by P by L.

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

_ Dependencies_

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

Select this option to rotate the radiation pattern of the antenna array elements according to the grid normal.

If the flag is not checked, the antenna element’s radiation pattern does not rotate.

If the antenna is used in an antenna array and the parameter Input Pattern Coordinate System is set to az-el If this flag is selected, the radiation pattern rotates so that the x axis of the coordinate system of the element is directed along the normal of the grid.

If the checkbox is not checked, the element’s layout is used without rotation.

If the antenna is used in an antenna array and the parameter Input Pattern Coordinate System is set to phi-theta, then when this checkbox is selected, the radiation pattern rotates so that the axis z of the coordinate system of the element is directed along the normal of the grid.

Use this parameter together with the Array normal parameter. URA and UCA antenna arrays.

_ Dependencies_

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

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

Dependencies

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

The exponents of the cosine radiation pattern are in the form of a non-negative scalar or a 1 by 2 real matrix of non-negative values.

If the Exponent of cosine pattern is a 1 by 2 vector, then the first element is an indicator in the direction of the azimuth, and the second is in the direction of the location. With a scalar value of this parameter, the cosines in the azimuthal and elevation directions are raised to one power.

Dependencies

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

Select this option to mute the response of the element.

During jamming, the responses at all azimuth angles exceeding ± 90° from the wide side are set to zero. The wide side is defined as the azimuth angle of 0° and the 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 elements of the antenna sublattice for ULA, set 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 for the Geometry parameter , the value ULA or UCA.

The radius of the UCA antenna sublattice, a positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Replicated subarray, and for the Geometry parameter , the value 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 in the leftmost column, and then move to the next columns from left to right. The figure shows an antenna sublattice for which the Array size parameter has the value [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 for the Geometry parameter , the value URA.

The distance between adjacent elements of the antenna sublattice in the form of a positive scalar.

Dependencies

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

The direction of the ULA linear axis, defined as y, x or z. All elements of the ULA antenna sublattice are evenly 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 for the Geometry parameter , the value ULA.

A grid 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 for the Geometry parameter , the value URA or UCA.

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

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

Dependencies

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

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

Dependencies

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

The direction of the normal vectors of the elements of the conformal antenna sublattice, specified as a column vector 2 by 1 or matrix 2 by N, where N means the number of elements in the antenna sublattice. For the matrix, each column sets the direction of the normal of the corresponding element in the form [azimuth;elevation] relative to the local coordinate system. In the local coordinate system, the positive axis x coincides with the direction of the normal to the conformal antenna sublattice. If the parameter value is a column vector 2 by 1, then the same pointing direction is used for all elements of the antenna sublattice.

Parameters of 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 can include translation, azimuth rotation, and elevation rotation. However, transformations that require rotation relative to the normal direction cannot be used.

Dependencies

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

The change in the radiation pattern of the antenna sublattice elements is set as a complex scalar or complex vector 1 by N, where N is the number of antenna sublattice elements.

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

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 parameter to Array (no subarrays) or Partitioned array.

The number of elements of the antenna sublattice for ULA, set 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 for the Geometry parameter , the value ULA or UCA.

The radius of the UCA antenna sublattice, a positive scalar.

Dependencies

To use this parameter, set the Specify sensor array as parameter to Array (no subarrays), and for the Geometry parameter , the value 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 in the leftmost column, and then move to the next columns from left to right. The figure shows an antenna sublattice for which the Array size parameter has the value [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 for the Geometry parameter , the value URA.

The distance between adjacent elements of the antenna sublattice in the form of a positive scalar.

Dependencies

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

The direction of the ULA linear axis, defined as y, x or z. All elements of the ULA antenna sublattice are evenly 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 for the Geometry parameter , the value ULA.

A grid 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 for the Geometry parameter , the value URA or UCA.

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

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

Dependencies

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

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

Dependencies

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

The direction of the normal vectors of the elements of the conformal antenna sublattice, defined as a column vector 2 by 1 or matrix 2 by N, where N means the number of elements in the antenna sublattice. For the matrix, each column sets the direction of the normal of the corresponding element in the form [azimuth;elevation] relative to the local coordinate system. In the local coordinate system, the positive axis x coincides with the direction of the normal to the conformal antenna sublattice. If the parameter value is a column vector 2 by 1, then the same pointing direction is used for all elements of the antenna sublattice.

Parameters of 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 can include translation, azimuth rotation, and elevation rotation. However, transformations that require rotation relative to the normal direction cannot be used.

Dependencies

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

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.

Dependencies

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

Specify the antenna sublattice as a matrix of M by N. 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 the antenna sublattice.

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

The phase center of each antenna sublattice is located in the geometric center of the antenna sublattice. The geometric center of the antenna sublattice depends on the antenna sublattice definition matrix and the Geometry parameter.

Dependencies

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

Specify the location of the replicated antenna sublattices.

Dependencies

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

The size of the grid of rectangular antenna sublattices, specified as a single positive integer or vector-a string of positive integers 1 by 2.

Dependencies

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

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

If the Grid spacing parameter is set to Auto When constructing a complete antenna array, replication preserves the distance between the elements of the sublattices for both rows and columns. This option is only available if the Geometry parameter is set to ULA or URA.

Dependencies

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

The positions of the antenna sublattices in the user grid, defined as a real matrix 3 by N, where N is the number of sublattices 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 for the Subarrays layout parameter, the value Custom.

The direction of the normals of the sublattices 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 defines the direction of the normal of the corresponding sublattice in the form [azimuth;elevation]. The angles are set relative to the local coordinate system.

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

Dependencies

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

The sublattice control method, defined as:

Dependencies

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

Verify sensor array the phase shift quantization bits of the sublattice, specified as a non-negative integer. A value of zero means that quantization 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.