Wideband Backscatter Radar Target
Backscatter wideband signals from radar target
Phased Array System Toolbox / Environment and Target
The Wideband Backscatter Radar Target block models the monostatic reflection of nonpolarized wideband electromagnetic signals from a radar target. The target radar cross-section (RCS) model includes four Swerling target fluctuation models and a nonfluctuating model. You can model several targets simultaneously by specifying multiple radar cross-section RCS matrices.
X — Wideband incident nonpolarized signal
vector | N-by-M complex-valued
Wideband incident nonpolarized signal, specified as an N-by-1 complex-valued vector or an N-by-M complex-valued matrix. The quantity N is the number of signal samples, and M is the number of independent signals reflecting off the target. Each column contains an independent signal to be reflected from the target.
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.
Complex Number Support: Yes
Ang — Incident signal direction
2-by-1 real-valued column vector | 2-by-M real-valued column matrix
Incident signal direction, specified as a 2-by-1 real-valued column
vector or a 2-by-M real-valued column matrix.
M is the number of signals reflecting from the
target. Each column of
Ang specifies the incident
direction of the corresponding signal in the form of an
[AzimuthAngle;ElevationAngle] pair. Units are
degrees. The number of columns in
Ang must match
the number of independent signals in
Update — Switch to update RCS
Switch to update RCS fluctuation model values, specified as
true, the RCS
value is updated. If
false, the RCS remains unchanged.
To enable this port, set the Fluctuation
model drop-down menu to
Port_1 — Narrowband reflected signal
1-by-M complex-valued vector | N-by-M complex-valued
Wideband nonpolarized signal, specified as an 1-by-M complex-valued vector or a N-by-M complex-valued matrix. Each column contains an independent signal reflected from the target.
The quantity N is the number of signal samples and M is the number of signals reflecting off the target. Each column corresponds to a different reflecting angle.
The output port contains signal samples arriving at the signal destination within the current input time frame. When the propagation time from source to destination exceeds the current time frame duration, the output does not contain all contributions from the input of the current time frame.
Backscatter pattern frequency vector (Hz) — Wideband backscatter pattern frequencies
[0,1e20] (default) | real-valued row vector of positive values in strictly increasing
Specify the frequencies used in the RCS matrix. The elements of this vector must be in strictly increasing order. The target has no response outside this frequency range. Frequencies are defined with respect to the physical frequency band, not the baseband. Frequency units are in Hz.
Azimuth angles (deg) — Azimuth angles
[-180:180] (default) | 1-by-P real-valued row vector | P-by-1 real-valued column vector
Azimuth angles used to define the angular coordinates of each column of the matrices specified by the RCS pattern (m^2) parameter. Specify the azimuth angles as a length P vector. P must be greater than two. Angle units are in degrees.
Elevation angles (deg) — Elevation angles
[-90:90] (default) | 1-by-Q real-valued row vector | Q-by-1 real-valued column vector
Elevation angles used to define the angular coordinates of each row of the matrices specified by the RCS pattern (m^2) parameter. Specify the elevation angles as a length Q vector. Q must be greater than two. Angle units are in degrees.
RCS pattern (m^2) — Radar cross-section pattern
ones(181,361) (default) | Q-by-P real-valued matrix | Q-by-P-by-K
real-valued array | 1-by-P-by-K real-valued
array | K-by-P real-valued matrix
Radar cross-section pattern, specified as a real-valued matrix or array.
|Q-by-P matrix||Specifies a matrix of RCS values as a function of Q elevation angles and P azimuth angles. The same RCS matrix is used for all frequencies.|
|Q-by-P-by-K array||Specifies an array of RCS patterns as a function of Q elevation angles, P azimuth angles, and K frequencies. If K = 1, the RCS pattern is equivalent to a Q-by-P matrix.|
|1-by-P-by-K array||Specifies a matrix of RCS values as a function of P azimuth angles and K frequencies. These dimension formats apply when there is only one elevation angle.|
Q is the length of the vector specified by the Elevation angles (deg) parameter.
P is the length of the vector specified by the Azimuth angles (deg) parameter.
K is the number of frequencies specified by the Backscatter pattern frequency vector (Hz) parameter.
You can specify patterns for L targets by putting L patterns into a cell array. All patterns must have the same dimensions. The value of L must match the column dimensions of the signals passed as input into the block. You can, however, use one pattern to model L multiple targets.
RCS units are in square meters.
Fluctuation model — Target fluctuation model
Target fluctuation model, specified as
Swerling4. If you set this parameter to a
value other than
Nonfluctuating, you must pass
false into the
Operating frequency (Hz) — Signal carrier frequency
300.0e6 (default) | positive real-valued scalar
Signal carrier frequency, specified as a positive real-valued scalar. Units are in hertz.
Introduced in R2016b