Backscatter Radar Target
Backscatter radar target
Phased Array System Toolbox / Environment and Target
The Backscatter Radar Target block models the monostatic radar reflections of nonpolarized electromagnetic signals from a target. Target model includes all four Swerling target fluctuation models and non-fluctuating model. You can model several targets simultaneously by specifying multiple radar cross-section (RCS) matrices.
X — Narrowband signal
vector | N-by-M complex-valued
Narrowband 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 signals reflecting from the target. Each column corresponds to an independent signal incident at a different reflecting angle.
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.
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
Narrowband 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.
Azimuth angles (deg) — Azimuth angles
[-180:180] (default) | 1-by-P real-valued row vector | P-by-1 real-valued column vector
Specify the azimuth angles used to define the angular coordinates of the RCS pattern (m^2) parameter. Specify azimuth angles as a length P vector. Units are degrees. P must be greater than two. This parameter determines the incident azimuthal arrival angle of any element of the cross-section patterns.
Elevation angles (deg) — Elevation angles
[-90:90] (default) | 1-by-Q real-valued row vector | Q-by-1 real-valued column vector
Specify the elevation angles used to define the angular coordinates of the RCS pattern (m^2) parameter. Specify elevation angles as a length Q vector. Units are degrees. Q must be greater than two. This parameter determines the incident elevation arrival angle of any element of the cross-section patterns.
RCS pattern (m^2) — Radar cross-section pattern
ones(181,361) (default) | Q-by-P real-valued matrix | Q-by-P-by-M
real-valued array | 1-by-P real-valued vector | M-by-P real-valued matrix
Radar cross-section pattern, specified as a Q-by-P real-valued matrix or a Q-by-P-by-M real-valued array.
Q is the length of the vector in the Elevation angles (deg) parameter.
P is the length of the vector in the Azimuth angles (deg) parameter.
M is the number of target patterns. The number of patterns corresponds to the number of signals passed into the input port
X. You can, however, use a single pattern to model multiple signals reflecting from a single target.
You can, however, use a single pattern to model multiple signals reflecting from a single target. Pattern units are square-meters.
Pattern units are square-meters.
Fluctuation model — Target fluctuation model
Nonfluctuating (default) |
Specify the statistical model of the target as either
Swerling4. When you set this parameter to a
value other than
Nonfluctuating, you then set
radar cross-sections parameters using the
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 by
physconst('LightSpeed'). Units are in meters per
Operating frequency (Hz) — Operating frequency
3e8 (default) | positive scalar
Carrier frequency of the signal that reflects from the target, specified as a positive scalar. Units are in hertz.
Introduced in R2016a